0001704292--12-312024Q2False396xbrli:sharesiso4217:USDiso4217:USDxbrli:sharesxbrli:pureiso4217:CNY00017042922024-01-012024-06-300001704292dei:AdrMember2024-01-012024-06-300001704292us-gaap:CommonStockMember2024-01-012024-06-300001704292us-gaap:CommonStockMember2024-07-310001704292dei:AdrMember2024-07-3100017042922024-06-3000017042922023-12-3100017042922024-04-012024-06-3000017042922023-04-012023-06-3000017042922023-01-012023-06-300001704292us-gaap:CommonStockMember2023-12-310001704292us-gaap:AdditionalPaidInCapitalMember2023-12-310001704292us-gaap:RetainedEarningsMember2023-12-310001704292us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-12-310001704292us-gaap:TreasuryStockCommonMember2023-12-310001704292us-gaap:CommonStockMember2024-01-012024-03-310001704292us-gaap:AdditionalPaidInCapitalMember2024-01-012024-03-3100017042922024-01-012024-03-310001704292us-gaap:RetainedEarningsMember2024-01-012024-03-310001704292us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-01-012024-03-310001704292us-gaap:CommonStockMember2024-03-310001704292us-gaap:AdditionalPaidInCapitalMember2024-03-310001704292us-gaap:RetainedEarningsMember2024-03-310001704292us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-03-310001704292us-gaap:TreasuryStockCommonMember2024-03-3100017042922024-03-310001704292us-gaap:CommonStockMember2024-04-012024-06-300001704292us-gaap:AdditionalPaidInCapitalMember2024-04-012024-06-300001704292us-gaap:RetainedEarningsMember2024-04-012024-06-300001704292us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-04-012024-06-300001704292us-gaap:CommonStockMember2024-06-300001704292us-gaap:AdditionalPaidInCapitalMember2024-06-300001704292us-gaap:RetainedEarningsMember2024-06-300001704292us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-06-300001704292us-gaap:TreasuryStockCommonMember2024-06-300001704292us-gaap:CommonStockMember2022-12-310001704292us-gaap:AdditionalPaidInCapitalMember2022-12-310001704292us-gaap:RetainedEarningsMember2022-12-310001704292us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-12-310001704292us-gaap:TreasuryStockCommonMember2022-12-3100017042922022-12-310001704292us-gaap:CommonStockMember2023-01-012023-03-310001704292us-gaap:AdditionalPaidInCapitalMember2023-01-012023-03-3100017042922023-01-012023-03-310001704292us-gaap:TreasuryStockCommonMember2023-01-012023-03-310001704292us-gaap:RetainedEarningsMember2023-01-012023-03-310001704292us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-01-012023-03-310001704292us-gaap:CommonStockMember2023-03-310001704292us-gaap:AdditionalPaidInCapitalMember2023-03-310001704292us-gaap:RetainedEarningsMember2023-03-310001704292us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-03-310001704292us-gaap:TreasuryStockCommonMember2023-03-3100017042922023-03-310001704292us-gaap:CommonStockMember2023-04-012023-06-300001704292us-gaap:AdditionalPaidInCapitalMember2023-04-012023-06-300001704292us-gaap:TreasuryStockCommonMember2023-04-012023-06-300001704292us-gaap:RetainedEarningsMember2023-04-012023-06-300001704292us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-04-012023-06-300001704292us-gaap:CommonStockMember2023-06-300001704292us-gaap:AdditionalPaidInCapitalMember2023-06-300001704292us-gaap:RetainedEarningsMember2023-06-300001704292us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-06-300001704292us-gaap:TreasuryStockCommonMember2023-06-3000017042922023-06-300001704292us-gaap:FairValueInputsLevel1Member2024-06-300001704292us-gaap:FairValueInputsLevel1Member2023-12-310001704292currency:USD2024-06-300001704292currency:USD2023-12-310001704292currency:CNY2024-06-300001704292currency:CNY2023-12-310001704292currency:HKD2024-06-300001704292currency:HKD2023-12-310001704292currency:AUD2024-06-300001704292currency:AUD2023-12-310001704292currency:TWD2024-06-300001704292currency:TWD2023-12-310001704292us-gaap:OfficeEquipmentMember2024-06-300001704292us-gaap:OfficeEquipmentMember2023-12-310001704292zlab:ElectronicEquipmentMember2024-06-300001704292zlab:ElectronicEquipmentMember2023-12-310001704292us-gaap:VehiclesMember2024-06-300001704292us-gaap:VehiclesMember2023-12-310001704292zlab:LaboratoryEquipmentMember2024-06-300001704292zlab:LaboratoryEquipmentMember2023-12-310001704292zlab:ManufacturingEquipmentMember2024-06-300001704292zlab:ManufacturingEquipmentMember2023-12-310001704292us-gaap:LeaseholdImprovementsMember2024-06-300001704292us-gaap:LeaseholdImprovementsMember2023-12-310001704292us-gaap:ConstructionInProgressMember2024-06-300001704292us-gaap:ConstructionInProgressMember2023-12-310001704292zlab:ZejulaMember2024-04-012024-06-300001704292zlab:ZejulaMember2023-04-012023-06-300001704292zlab:ZejulaMember2024-01-012024-06-300001704292zlab:ZejulaMember2023-01-012023-06-300001704292zlab:OptuneMember2024-04-012024-06-300001704292zlab:OptuneMember2023-04-012023-06-300001704292zlab:OptuneMember2024-01-012024-06-300001704292zlab:OptuneMember2023-01-012023-06-300001704292zlab:QinlockMember2024-04-012024-06-300001704292zlab:QinlockMember2023-04-012023-06-300001704292zlab:QinlockMember2024-01-012024-06-300001704292zlab:QinlockMember2023-01-012023-06-300001704292zlab:NuzyraMember2024-04-012024-06-300001704292zlab:NuzyraMember2023-04-012023-06-300001704292zlab:NuzyraMember2024-01-012024-06-300001704292zlab:NuzyraMember2023-01-012023-06-300001704292zlab:VyvgartMember2024-04-012024-06-300001704292zlab:VyvgartMember2023-04-012023-06-300001704292zlab:VyvgartMember2024-01-012024-06-300001704292zlab:VyvgartMember2023-01-012023-06-300001704292us-gaap:EmployeeStockOptionMember2024-01-012024-06-300001704292us-gaap:EmployeeStockOptionMember2023-01-012023-06-300001704292zlab:NonVestedRestrictedSharesMember2024-01-012024-06-300001704292zlab:NonVestedRestrictedSharesMember2023-01-012023-06-300001704292us-gaap:LoansPayableMemberzlab:BankOfChinaWorkingCapitalLoanFacilityMember2024-06-300001704292zlab:SPDBankWorkingCapitalLoanFacilityMemberus-gaap:LoansPayableMember2024-06-300001704292us-gaap:StandbyLettersOfCreditMemberzlab:BankOfChinaWorkingCapitalLoanFacilityMember2024-02-050001704292us-gaap:StandbyLettersOfCreditMemberzlab:BankOfChinaWorkingCapitalLoanFacilityMember2024-02-052024-02-050001704292zlab:BankOfChinaWorkingCapitalLoanFacilityMember2024-03-310001704292us-gaap:StandbyLettersOfCreditMemberzlab:BankOfChinaWorkingCapitalLoanFacilityMember2024-02-060001704292us-gaap:StandbyLettersOfCreditMemberzlab:BankOfChinaWorkingCapitalLoanFacilityMember2024-06-200001704292us-gaap:LoansPayableMemberzlab:BankOfChinaWorkingCapitalLoanFacilityMemberzlab:ZaiLabShanghaiCo.Ltd.Member2024-06-300001704292us-gaap:LoansPayableMemberzlab:BankOfChinaWorkingCapitalLoanFacilityMemberzlab:ZaiLabShanghaiCo.Ltd.Member2024-01-012024-06-300001704292zlab:ShanghaiPudongDevelopmentBankCo.Ltd.Member2024-02-060001704292zlab:SPDBankWorkingCapitalLoanFacilityMemberus-gaap:LoansPayableMemberzlab:ZaiLabShanghaiCo.Ltd.Member2024-03-310001704292zlab:SPDBankWorkingCapitalLoanFacilityMemberus-gaap:LoansPayableMemberzlab:ZaiLabShanghaiCo.Ltd.Member2024-01-012024-06-300001704292zlab:SPDBankWorkingCapitalLoanFacilityMemberus-gaap:LoansPayableMemberzlab:ZaiLabShanghaiCo.Ltd.Member2024-06-300001704292zlab:NingboBankWorkingCapitalLoanFacilityMemberzlab:ZaiLabSuzhouCompanyLimitedMemberus-gaap:LoansPayableMember2024-02-060001704292zlab:NingboBankWorkingCapitalLoanFacilityMemberus-gaap:LoansPayableMember2024-02-060001704292zlab:NonVestedRestrictedSharesMember2024-01-012024-06-300001704292us-gaap:EmployeeStockOptionMember2024-01-012024-06-300001704292us-gaap:EmployeeStockOptionMemberzlab:April2023AndLaterMember2024-01-012024-06-300001704292us-gaap:EmployeeStockOptionMemberzlab:PriorToApril2023Member2024-01-012024-06-300001704292us-gaap:EmployeeStockOptionMemberzlab:ShareBasedPaymentArrangementTrancheFourMemberzlab:April2023AndLaterMember2024-01-012024-06-300001704292us-gaap:ShareBasedCompensationAwardTrancheTwoMemberus-gaap:EmployeeStockOptionMemberzlab:April2023AndLaterMember2024-01-012024-06-300001704292us-gaap:EmployeeStockOptionMemberzlab:April2023AndLaterMemberus-gaap:ShareBasedCompensationAwardTrancheThreeMember2024-01-012024-06-300001704292us-gaap:EmployeeStockOptionMemberzlab:April2023AndLaterMemberus-gaap:ShareBasedCompensationAwardTrancheOneMember2024-01-012024-06-300001704292us-gaap:EmployeeStockOptionMemberzlab:PriorToApril2023Memberus-gaap:ShareBasedCompensationAwardTrancheOneMember2024-01-012024-06-300001704292us-gaap:ShareBasedCompensationAwardTrancheTwoMemberus-gaap:EmployeeStockOptionMemberzlab:PriorToApril2023Member2024-01-012024-06-300001704292us-gaap:EmployeeStockOptionMemberus-gaap:ShareBasedCompensationAwardTrancheThreeMemberzlab:PriorToApril2023Member2024-01-012024-06-300001704292us-gaap:EmployeeStockOptionMemberzlab:ShareBasedPaymentArrangementTrancheFourMemberzlab:PriorToApril2023Member2024-01-012024-06-300001704292zlab:ShareBasedPaymentArrangementTrancheFiveMemberus-gaap:EmployeeStockOptionMemberzlab:PriorToApril2023Member2024-01-012024-06-300001704292us-gaap:SellingGeneralAndAdministrativeExpensesMember2024-04-012024-06-300001704292us-gaap:SellingGeneralAndAdministrativeExpensesMember2023-04-012023-06-300001704292us-gaap:SellingGeneralAndAdministrativeExpensesMember2024-01-012024-06-300001704292us-gaap:SellingGeneralAndAdministrativeExpensesMember2023-01-012023-06-300001704292us-gaap:ResearchAndDevelopmentExpenseMember2024-04-012024-06-300001704292us-gaap:ResearchAndDevelopmentExpenseMember2023-04-012023-06-300001704292us-gaap:ResearchAndDevelopmentExpenseMember2024-01-012024-06-300001704292us-gaap:ResearchAndDevelopmentExpenseMember2023-01-012023-06-300001704292us-gaap:EmployeeStockOptionMember2024-06-300001704292zlab:NonVestedRestrictedSharesMember2024-06-300001704292zlab:InnovivaInc.Member2024-04-012024-06-300001704292zlab:InnovivaInc.Member2024-06-300001704292zlab:BMSMember2024-04-012024-06-300001704292zlab:BMSMember2024-06-300001704292country:CN2023-01-012023-06-300001704292country:CN2024-04-012024-06-300001704292country:CN2023-04-012023-06-300001704292country:CN2024-01-012024-06-300001704292country:CN2023-12-310001704292country:CN2024-06-300001704292us-gaap:PropertyPlantAndEquipmentMember2024-06-300001704292zlab:ChinaMerchantsBankCo.Ltd.Memberus-gaap:SubsequentEventMember2024-07-050001704292zlab:CMBWorkivaCapitalLoanFacilityMemberus-gaap:LoansPayableMemberzlab:ZaiLabShanghaiCo.Ltd.Memberus-gaap:SubsequentEventMember2024-07-050001704292zlab:CMBWorkivaCapitalLoanFacilityMemberus-gaap:LoansPayableMemberzlab:ZaiLabShanghaiCo.Ltd.Memberus-gaap:SubsequentEventMember2024-07-052024-07-050001704292zlab:RichardGaynorMember2024-01-012024-06-300001704292zlab:RichardGaynorMember2024-04-012024-06-300001704292zlab:RichardGaynorMember2024-06-30

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

____________________

FORM 10-Q

____________________

(Mark One)

x			QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2024

OR

o			TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from ______ to ______

Commission File Number: 001-38205

____________________

ZAI LAB LIMITED

(Exact Name of Registrant as Specified in its Charter)

____________________

Cayman Islands			98-1144595
(State or Other Jurisdiction of Incorporation or Organization)			(I.R.S. Employer Identification No.)
4560 Jinke Road Bldg. 1, Fourth Floor, Pudong Shanghai China			201210
314 Main Street 4th Floor, Suite 100 Cambridge, MA, USA			02142
(Address of Principal Executive Offices)			(Zip Code)

+86 216163 2588

+1 857 706 2604

(Registrant’s Telephone Number, Including Area Code)

____________________

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

American Depositary Shares, each representing 10 Ordinary Shares, par value $0.000006 per share

ZLAB

The Nasdaq Global Market

Ordinary Shares, par value $0.000006 per share*

9688

The Stock Exchange of Hong Kong Limited

*Included in connection with the registration of the American Depositary Shares with the Securities and Exchange Commission. The ordinary shares are not registered or listed for trading in the United States but are listed for trading on The Stock Exchange of Hong Kong Limited.

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer

x

Accelerated filer

o

Non-accelerated filer

o

Smaller reporting company

o

Emerging growth company

o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

As of July 31, 2024, 996,087,670 ordinary shares of the registrant, par value $0.000006 per share, were outstanding, of which 762,101,560 ordinary shares were held in the form of American Depositary Shares.

---

Table of Contents

Zai Lab Limited

Quarterly Report on Form 10-Q

For the Second Quarter of 2024

						Page
PART I.			FINANCIAL INFORMATION			2
Item 1.			Financial Statements (Unaudited)			2
			Condensed Consolidated Balance Sheets as of June 30, 2024 and December 31, 2023			2
			Condensed Consolidated Statements of Operations for the Three and Six Months Ended June 30, 2024 and 2023			3
			Condensed Consolidated Statements of Comprehensive Loss for the Three and Six Months Ended June 30, 2024 and 2023			4
			Condensed Consolidated Statements of Shareholders’ Equity for the Three and Six Months Ended June 30, 2024 and 2023			5
			Condensed Consolidated Statements of Cash Flows for the Three and Six Months Ended June 30, 2024 and 2023			7
			Notes to the Unaudited Condensed Consolidated Financial Statements			8
Item 2.			Management’s Discussion and Analysis of Financial Condition and Results of Operations			15
Item 3.			Quantitative and Qualitative Disclosures about Market Risk			25
Item 4.			Controls and Procedures			27
PART II.			OTHER INFORMATION			28
Item 1.			Legal Proceedings			28
Item 1A.			Risk Factors			28
Item 2.			Unregistered Sales of Equity Securities and Use of Proceeds			28
Item 3.			Defaults upon Senior Securities			28
Item 4.			Mine Safety Disclosures			28
Item 5.			Other Information			28
Item 6.			Exhibits			29
Signatures						30

---

SPECIAL NOTES REGARDING THE COMPANY

Forward-Looking Statements

This report contains certain forward-looking statements, including statements relating to our strategy and plans; potential of and expectations for our business, commercial products, and pipeline programs; the market for our commercial and pipeline products; capital allocation and investment strategy; clinical development programs and related clinical trials; clinical trial data, data readouts, and presentations; risks and uncertainties associated with drug development and commercialization; regulatory discussions, submissions, filings, and approvals and the timing thereof; the potential benefits, safety, and efficacy of our products and product candidates and those of our collaboration partners; the anticipated benefits and potential of investments, collaborations, and business development activities; our profitability and timeline to profitability; and our future financial and operating results. All statements, other than statements of historical fact, included in this report are forward-looking statements, and can be identified by words such as “aim,” “anticipate,” “believe,” “contemplate,” “continue,” “could,” “estimate,” “expect,” “forecast,” “goal,” “intend,” “may,” “plan,” “possible,” “potential,” “predict,” “project,” “seek,” “should,” “target,” “will,” “would,” or the negative of these terms or similar expressions. Such statements constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are not guarantees or assurances of future performance. Forward-looking statements are based on our expectations and assumptions as of the date of this report and are subject to inherent uncertainties, risks, and changes in circumstances that may differ materially from those contemplated by the forward-looking statements. We may not actually achieve the plans, carry out the intentions, or meet the expectations or projections disclosed in our forward-looking statements, and you should not place undue reliance on these forward-looking statements. Actual results may differ materially from those indicated by such forward-looking statements as a result of various important factors, including but not limited to the following:

•    Our ability to successfully commercialize and generate revenue from our approved products;

•    Our ability to obtain funding for our operations and business initiatives;

•    The results of our clinical and pre-clinical development of our product candidates;

•    The content and timing of decisions made by the relevant regulatory authorities regarding regulatory approvals of our product candidates;

•    Changes in U.S. and China trade policies and relations, as well as relations with other countries, and/or changes in regulations and/or sanctions;

•    Actions the Chinese government may take to intervene in or influence our operations;

•    Economic, political, and social conditions in mainland China, as well as governmental policies;

•    Uncertainties in the Chinese legal system, including with respect to the anti-corruption enforcement efforts in China and the Counter-Espionage Law, the Data Security Law, the Cyber Security Law, the Cybersecurity Review Measures, the Personal Information Protection Law, the Regulation on the Administration of Human Genetic Resources, the Biosecurity Law, the Measures on Security Assessment of Cross-Border Data Transfer (the “Security Assessment Measures”), and other future laws and regulations or amendments to such laws and regulations;

•    Approval, filing, or procedural requirements imposed by the China Securities Regulatory Commission or other Chinese regulatory authorities in connection with issuing securities to foreign investors under Chinese law;

•    Any violation or liability under the U.S. Foreign Corrupt Practices Act (“FCPA”) or Chinese anti-corruption laws;

•    Restrictions on currency exchange;

•    Limitations on the ability of our Chinese subsidiaries to make payments to us;

•    Chinese requirements on the ability of residents in mainland China to establish offshore special purpose companies;

•    Chinese regulations regarding acquisitions of companies based in mainland China by foreign investors;

•    Any issues that our Chinese manufacturing facilities may have with operating in conformity with established Good Manufacturing Practices (“GMPs”) and international best practices, and with passing U.S. Food and Drug Administration (“FDA”), China National Medical Products Administration (“NMPA”), and European Medicines Agency (“EMA”) inspections;

---

•    Expiration of, or changes to, financial incentives or discretionary policies granted by local governments in mainland China;

•    Restrictions or limitations on the ability of overseas regulators to conduct investigations or collect evidence within mainland China;

•    Business disruptions caused by pandemics such as COVID-19, international war or conflict such as the Russia/Ukraine and Israel/Hamas wars, natural disasters, extreme weather events, and other significant disruptions outside of our control;

•    Unfavorable tax consequences to us and our non-Chinese shareholders or American Depositary Share (“ADS”) holders if we were to be classified as a Chinese resident enterprise for Chinese income tax purposes;

•    Failure to comply with applicable Chinese, U.S., and Hong Kong regulations that could lead to government enforcement actions, fines, other legal or administrative sanctions, and/or harm to our business or reputation;

•    Review by the U.S. Committee on Foreign Investment (“CFIUS”) in our investments or other delays or obstacles for closing transactions;

•    Any inability to renew our current leases on desirable terms or otherwise locate desirable alternatives for our leased properties;

•    Any inability of third parties on whom we rely to conduct our pre-clinical and clinical trials to successfully carry out their contractual duties or meet expected deadlines; and

•    Any inability to obtain or maintain sufficient patent protection for our products and product candidates.

These factors should not be construed as exhaustive and should be read with the other cautionary statements and information in our Annual Report on Form 10-K for the year ended December 31, 2023 (the “2023 Annual Report”), Quarterly Report on Form 10-Q for the three months ended March 31, 2024, and this report. Forward-looking statements are based on our management’s beliefs and assumptions and information currently available to our management. These statements, like all statements in this report, speak only as of their date. We anticipate that subsequent events and developments will cause our expectations and assumptions to change, and we undertake no obligation to update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise, except as may be required by law. These forward-looking statements should not be relied upon as representing our views as of any date subsequent to the date of this report.

Usage of Terms

Unless the context requires otherwise, references in this report to “Greater China” refer to mainland China, Hong Kong Special Administrative Region (“Hong Kong” or “HK”), Macau Special Administrative Region (“Macau”), and Taiwan, collectively; references to “Zai Lab,” the “Company,” “we,” “us,” and “our” refer to Zai Lab Limited, a holding company, and its subsidiaries, on a consolidated basis; and references to “Zai Lab Limited” refer to Zai Lab Limited, a holding company. Zai Lab Limited is the entity in which investors hold their interest.

Our operating subsidiaries consist of Zai Lab (Hong Kong) Limited, domiciled in Hong Kong; Zai Auto Immune (Hong Kong) Limited, domiciled in Hong Kong; Zai Anti Infectives (Hong Kong) Limited, domiciled in Hong Kong; Zai Lab (Shanghai) Co., Ltd., domiciled in mainland China; Zai Lab International Trading (Shanghai) Co., Ltd., domiciled in mainland China; Zai Lab (Suzhou) Co., Ltd., domiciled in mainland China; Zai Biopharmaceutical (Suzhou) Co., Ltd., domiciled in mainland China; Zai Lab Trading (Suzhou) Co., Ltd., domiciled in mainland China; Zai Lab (Taiwan) Limited, domiciled in Taiwan; Zai Lab (AUST) Pty. Ltd., domiciled in Australia; and Zai Lab (US) LLC, domiciled in the United States. As of the date of this report, Zai Anti Infectives (Hong Kong) Limited has non-substantial business operations.

We own various trademarks, including various forms of the Zai Lab brand (in English and Chinese), as well as several domain names that incorporate such trademarks. Trademarks and trade names of other companies appearing in this report are the property of their respective holders. Solely for convenience, some of the trademarks and trade names in this report are referred to without the ® and ™ symbols, but such references should not be construed as any indicator that their respective owners will not assert, to the fullest extent under applicable law, their rights thereto. We do not intend our use or display of other companies’ trademarks and trade names to imply a relationship with, or endorsement or sponsorship of, any other company.

---

PART I – FINANCIAL INFORMATION

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with the unaudited condensed consolidated financial statements and the accompanying notes included in this report and the audited consolidated financial information and the accompanying notes included in our 2023 Annual Report.

1

---

Item 1. Financial Statements.

Zai Lab Limited

Unaudited Condensed Consolidated Balance Sheets

(in thousands of U.S. dollars (“$”), except for number of shares and per share data)

			Notes						June 30, 2024						December 31, 2023
Assets
Current assets
Cash and cash equivalents			3						630,048						790,151
Restricted cash, current									100,000						—
Short-term investments									—						16,300
Accounts receivable (net of allowance for credit losses of $20 and $17 as of June 30, 2024 and December 31, 2023, respectively)									69,635						59,199
Notes receivable									8,102						6,134
Inventories, net			4						41,846						44,827
Prepayments and other current assets									20,292						22,995
Total current assets									869,923						939,606
Restricted cash, non-current									1,116						1,113
Long term investments									4,073						9,220
Prepayments for equipment									46						111
Property and equipment, net			5						50,613						53,734
Operating lease right-of-use assets									13,102						14,844
Land use rights, net									2,991						3,069
Intangible assets, net									44,063						13,389
Long-term deposits									1,441						1,209
Total assets									987,368						1,036,295
Liabilities and shareholders’ equity
Current liabilities
Accounts payable									127,344						112,991
Current operating lease liabilities									7,581						7,104
Short-term debt			9						70,298						—
Other current liabilities			10						46,495						82,972
Total current liabilities									251,718						203,067
Deferred income									25,343						28,738
Non-current operating lease liabilities									5,803						8,047
Other non-current liabilities									325						325
Total liabilities									283,189						240,177
Commitments and contingencies (Note 15)
Shareholders’ equity
Ordinary shares (par value of $0.000006 per share; 5,000,000,000 shares authorized; 986,310,340 and 977,151,270 shares issued as of June 30, 2024 and December 31, 2023, respectively; 981,398,140 and 972,239,070 shares outstanding as of June 30, 2024 and December 31, 2023, respectively)									6						6
Additional paid-in capital									3,011,964						2,975,302
Accumulated deficit									(2,329,728)						(2,195,980)
Accumulated other comprehensive income									42,773						37,626
Treasury Stock (at cost, 4,912,200 shares as of both June 30, 2024 and December 31, 2023)									(20,836)						(20,836)
Total shareholders’ equity									704,179						796,118
Total liabilities and shareholders’ equity									987,368						1,036,295

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

2

---

Zai Lab Limited

Unaudited Condensed Consolidated Statements of Operations

(in thousands of $, except for number of shares and per share data)

									Three Months Ended June 30,												Six Months Ended June 30,
			Notes						2024						2023						2024						2023
Revenues
Product revenue, net			6						100,106						68,864						187,255						131,661
Collaboration revenue			6						398						—						398						—
Total revenues									100,504						68,864						187,653						131,661
Expenses
Cost of product revenue									(35,148)						(23,763)						(68,767)						(45,100)
Cost of collaboration revenue									(85)						—						(85)						—
Research and development									(61,625)						(76,682)						(116,270)						(125,153)
Selling, general, and administrative									(79,710)						(67,920)						(148,904)						(130,430)
Gain on sale of intellectual property									—						10,000						—						10,000
Loss from operations									(76,064)						(89,501)						(146,373)						(159,022)
Interest income									9,330						10,090						18,988						20,321
Interest expense									(492)						—						(605)						—
Foreign currency losses									(4,108)						(40,079)						(6,176)						(31,167)
Other (expenses) income, net			13						(8,943)						(1,405)						418						(171)
Loss before income tax									(80,277)						(120,895)						(133,748)						(170,039)
Income tax expense			7						—						—						—						—
Net loss									(80,277)						(120,895)						(133,748)						(170,039)
Loss per share - basic and diluted			8						(0.08)						(0.13)						(0.14)						(0.18)
Weighted-average shares used in calculating net loss per ordinary share - basic and diluted									975,937,790						964,817,310						974,541,780						963,140,360

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

3

---

Zai Lab Limited

Unaudited Condensed Consolidated Statements of Comprehensive Loss

(in thousands of $)

									Three Months Ended June 30,												Six Months Ended June 30,
									2024						2023						2024						2023
Net loss									(80,277)						(120,895)						(133,748)						(170,039)
Other comprehensive income, net of tax of nil:
Foreign currency translation adjustments									3,605						34,908						5,147						26,495
Comprehensive loss									(76,672)						(85,987)						(128,601)						(143,544)

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

4

---

Zai Lab Limited

Unaudited Condensed Consolidated Statements of Shareholders’ Equity

(in thousands of $, except for number of shares)

			Ordinary Shares												Additional paid in capital						Accumulated deficit						Accumulated other comprehensive income						Treasury Stock												Total
			Number of Shares						Amount																								Shares						Amount
Balance at December 31, 2023			977,151,270						6						2,975,302						(2,195,980)						37,626						(4,912,200)						(20,836)						796,118
Issuance of ordinary shares upon vesting of restricted shares			1,046,440						0						0						—						—						—						—						—
Share-based compensation			—						—						17,980						—						—						—						—						17,980
Net loss			—						—						—						(53,471)						—						—						—						(53,471)
Foreign currency translation			—						—						—						—						1,542						—						—						1,542
Balance at March 31, 2024			978,197,710						6						2,993,282						(2,249,451)						39,168						(4,912,200)						(20,836)						762,169
Issuance of ordinary shares upon vesting of restricted shares			8,087,630						0						0						—						—						—						—						—
Exercise of share options			25,000						0						44						—						—						—						—						44
Share-based compensation			—						—						18,638						—						—						—						—						18,638
Net loss			—						—						—						(80,277)						—						—						—						(80,277)
Foreign currency translation			—						—						—						—						3,605						—						—						3,605
Balance at June 30, 2024			986,310,340						6						3,011,964						(2,329,728)						42,773						(4,912,200)						(20,836)						704,179

5

---

			Ordinary Shares												Additional paid in capital						Accumulated deficit						Accumulated other comprehensive income (loss)						Treasury Stock												Total
			Number of Shares						Amount																								Shares						Amount
Balance at December 31, 2022			962,455,850						6						2,893,120						(1,861,360)						25,685						(2,236,280)						(11,856)						1,045,595
Issuance of ordinary shares upon vesting of restricted shares			732,040						0						0						—						—						—						—						—
Exercise of share options			4,009,460						0						1,673						—						—						—						—						1,673
Receipt of shares netted to satisfy tax withholding obligations related to share-based compensation			—						—						—						—						—						(1,272,330)						(5,130)						(5,130)
Share-based compensation			—						—						16,661						—						—						—						—						16,661
Net loss			—						—						—						(49,144)						—						—						—						(49,144)
Foreign currency translation			—						—						—						—						(8,413)						—						—						(8,413)
Balance at March 31, 2023			967,197,350						6						2,911,454						(1,910,504)						17,272						(3,508,610)						(16,986)						1,001,242
Issuance of ordinary shares upon vesting of restricted shares			6,117,040						0						0						—						—						—						—						—
Exercise of share options			41,000						0						88						—						—						—						—						88
Receipt of shares netted to satisfy tax withholding obligations related to share-based compensation			—						—						—						—						—						(1,280,500)						(3,540)						(3,540)
Share-based compensation			—						—						20,511						—						—						—						—						20,511
Net loss			—						—						—						(120,895)						—						—						—						(120,895)
Foreign currency translation			—						—						—						—						34,908						—						—						34,908
Balance at June 30, 2023			973,355,390						6						2,932,053						(2,031,399)						52,180						(4,789,110)						(20,526)						932,314

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements. “0” in above table means less than 1,000 dollars.

6

---

Zai Lab Limited

Unaudited Condensed Consolidated Statements of Cash Flows

(in thousands of $)

			Six Months Ended June 30,
			2024						2023
Cash flows from operating activities
Net loss			(133,748)						(170,039)
Adjustments to reconcile net loss to net cash used in operating activities:
Allowance for credit losses			3						3
Inventory write-down			756						623
Depreciation and amortization expenses			5,953						4,652
Amortization of deferred income			(1,679)						(1,716)
Share-based compensation			36,618						37,172
Loss from fair value changes of equity investment with readily determinable fair value			5,147						1,304
Losses on disposal of property and equipment			450						260
Gain on disposal of land use right			—						(404)
Noncash lease expenses			4,141						4,383
Gain from sale of intellectual property			—						(10,000)
Debt issuance costs			700						—
Foreign currency remeasurement impact			6,176						31,167
Changes in operating assets and liabilities:
Accounts receivable			(10,842)						(8,863)
Notes receivable			(2,013)						(12,714)
Inventories			2,037						(6,627)
Prepayments and other current assets			2,612						87
Long-term deposits			(232)						(184)
Accounts payable			(6,117)						3,037
Other current liabilities			(35,607)						(6,761)
Operating lease liabilities			(5,086)						(3,596)
Deferred income			(1,548)						9,902
Other non-current liabilities			—						325
Net cash used in operating activities			(132,279)						(127,989)
Cash flows from investing activities
Purchases of short-term investments			—						(100,000)
Proceeds from maturity of short-term investment			16,300						84,500
Purchases of property and equipment			(1,715)						(5,234)
Proceeds from the sale of property and equipment			29						112
Acquisition of intangible assets			(12,168)						(630)
Proceeds from sale of intellectual property			—						10,000
Net cash provided by (used in) investing activities			2,446						(11,252)
Cash flows from financing activities
Proceeds from short-term debt			70,526						—
Payments of debt issuance costs			(700)						—
Proceeds from exercises of stock options			44						1,762
Taxes paid related to settlement of equity awards			—						(7,141)
Net cash provided by (used in) financing activities			69,870						(5,379)
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash			(137)						(3,707)
Net decrease in cash, cash equivalents and restricted cash			(60,100)						(148,327)
Cash, cash equivalents and restricted cash - beginning of period			791,264						1,009,273
Cash, cash equivalents and restricted cash - end of period			731,164						860,946
Supplemental disclosure on non-cash investing and financing activities
Payables for purchase of property and equipment			2,391						4,344
Payables for acquisition of intangible assets			32,525						96
Payables for treasury stock			—						1,531
Right-of-use asset acquired under operating leases			2,389						3,313
Receivables for disposal of land use right			—						3,867
Supplemental disclosure of cash flow information
Cash paid for interest			496						—

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

7

---

Zai Lab Limited

Notes to the unaudited condensed consolidated financial statements

1. Organization and Principal Activities

Zai Lab Limited was incorporated on March 28, 2013 in the Cayman Islands as an exempted company with limited liability under the Companies Act of the Cayman Islands (as amended). Zai Lab Limited and its subsidiaries (collectively referred to as the “Company”) are focused on discovering, developing, and commercializing products that address medical conditions with significant unmet needs in the areas of oncology, immunology, neuroscience, and infectious disease.

The Company’s principal operations and geographic markets are in Greater China. The Company has a substantial presence in Greater China and the United States.

2. Basis of Presentation and Consolidation and Significant Accounting Policies

(a) Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”), and applicable rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”), regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this report should be read in conjunction with the consolidated financial statements and accompanying notes included in the Annual Report on Form 10-K for the year ended December 31, 2023 (the “2023 Annual Report”). The December 31, 2023 condensed consolidated balance sheet data included in this report were derived from the audited financial statements in the 2023 Annual Report.

The accompanying condensed consolidated financial statements reflect all normal recurring adjustments that are necessary to present fairly the results for the interim periods presented. Interim results are not necessarily indicative of the results for the year ending December 31, 2024.

(b) Principles of Consolidation

The unaudited condensed consolidated financial statements include the accounts of Zai Lab Limited and its subsidiaries, which are wholly owned. All intercompany transactions and balances are eliminated upon consolidation.

(c) Use of Estimates

The preparation of the unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates, judgments, and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the period. Areas where management uses subjective judgment include, but are not limited to, accrual of rebates, recognition of research and development expenses, fair value of share-based compensation expenses, and recoverability of deferred tax assets. These estimates, judgments, and assumptions can affect the reported amounts of assets and liabilities as of the date of the financial statements as well as the reported amounts of revenues and expenses during the periods presented. Actual results could differ from these estimates.

(d) Fair Value Measurements

Equity investments with readily determinable fair value are measured using level 1 inputs and were $4.1 million and $9.2 million as of June 30, 2024 and December 31, 2023, respectively. The unrealized losses from fair value changes are recognized in other expenses (income), net in the condensed consolidated statements of operations.

Financial instruments of the Company primarily include cash and cash equivalents, current restricted cash, short-term investments, accounts receivable, notes receivable, prepayments and other current assets, non-current restricted cash,

8

---

Zai Lab Limited

Notes to the unaudited condensed consolidated financial statements

accounts payable, short-term debt, and other current liabilities. As of June 30, 2024 and December 31, 2023, the carrying values of cash and cash equivalents, current restricted cash, short-term investments, accounts receivable, prepayments and other current assets, accounts payable, short-term debt, and other current liabilities approximated their fair value due to the short-term maturity of these instruments, and the carrying value of notes receivable and non-current restricted cash approximated their fair value based on the assessment of the ability to recover these amounts.

(e) Recent Accounting Pronouncements

In November 2023, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2023-07, Improvements to Reportable Segment Disclosures (Topic 280). This ASU requires all public entities, including public entities with a single reportable segment, to disclose the title and position of the Chief Operating Decision Maker (“CODM”) and the significant segment expenses and any additional measures of a segment’s profit or loss used by the CODM to allocate resources and assess performance. This ASU is effective on a retrospective basis for fiscal years beginning after December 15, 2023 and for interim periods beginning after December 15, 2024. Early adoption is permitted. The Company is currently evaluating the impact of this ASU and expects to adopt it for the year ending December 31, 2024.

In December 2023, the FASB issued ASU No. 2023-09, Improvements to Income Tax Disclosures (Topic 740). This ASU requires disaggregated information about a reporting entity’s effective tax rate reconciliation as well as additional information on income taxes paid. This ASU is effective on a prospective basis for annual periods beginning after December 15, 2024. Early adoption is permitted. This ASU will result in additional disclosure in the consolidated financial statements, once adopted. The Company is currently evaluating the impact of this ASU and expects to adopt it for the year ending December 31, 2025.

The Company did not adopt any new accounting standards in the six months ended June 30, 2024 that had a material impact on the Consolidated Financial Statements. For additional information on the Company’s significant accounting policies, refer to the notes to the consolidated financial statements in the 2023 Annual Report.

3. Cash and Cash Equivalents

The following table presents the Company’s cash and cash equivalents ($ in thousands):

			June 30, 2024						December 31, 2023
Cash			628,920						789,051
Cash equivalents (i)			1,128						1,100
			630,048						790,151
Denominated in:
US$			607,615						762,436
Renminbi (“RMB”) (ii)			21,074						25,093
Hong Kong dollar (“HK$”)			597						1,974
Australian dollar (“A$”)			565						587
Taiwan dollar (“TW$”)			197						61
			630,048						790,151

(i)Cash equivalents represent short-term and highly liquid investments in a money market fund.

(ii)Certain cash and bank balances denominated in RMB were deposited with banks in mainland China. The conversion of these RMB-denominated balances into foreign currencies is subject to the rules and regulations of foreign exchange control promulgated by the Chinese government.

9

---

Zai Lab Limited

Notes to the unaudited condensed consolidated financial statements

4. Inventories, Net

The following table presents the Company’s inventories, net ($ in thousands):

			June 30, 2024						December 31, 2023
Finished goods			23,365						22,702
Raw materials			16,107						17,655
Work in progress			2,374						4,470
Inventories, net			41,846						44,827

The Company writes down inventory for any excess or obsolete inventories or when the Company believes that the net realizable value of inventories is less than the carrying value. The Company recorded write-downs in inventory, which were included in cost of product revenue, of $0.7 million and $0.8 million in the three and six months ended June 30, 2024, respectively, and $0.2 million and $0.6 million in the three and six months ended June 30, 2023, respectively.

5. Property and Equipment, Net

The following table presents the components of the Company’s property and equipment, net ($ in thousands):

			June 30, 2024						December 31, 2023
Office equipment			1,043						1,047
Electronic equipment			9,189						9,161
Vehicle			197						199
Laboratory equipment			20,244						20,140
Manufacturing equipment			17,619						17,680
Leasehold improvements			11,368						11,371
Construction in progress			24,851						24,272
			84,511						83,870
Less: accumulated depreciation			(33,898)						(30,136)
Property and equipment, net			50,613						53,734

Depreciation expense was $2.2 million and $4.4 million in the three and six months ended June 30, 2024, respectively, and $1.8 million and $4.3 million in the three and six months ended June 30, 2023, respectively.

6. Revenues

Product Revenue, Net

The Company’s product revenue is derived from the sales of its commercial products primarily in mainland China. The table below presents the Company’s gross and net product revenue ($ in thousands):

			Three Months Ended June 30,												Six Months Ended June 30,
			2024						2023						2024						2023
Product revenue - gross			106,611						75,010						199,723						146,222
Less: Rebates and sales returns			(6,505)						(6,146)						(12,468)						(14,561)
Product revenue - net			100,106						68,864						187,255						131,661

Sales rebates are offered to distributors in mainland China, and the amounts are recorded as a reduction of product revenue. Estimated rebates are determined based on contracted rates, sales volumes, and level of distributor inventories.

10

---

Zai Lab Limited

Notes to the unaudited condensed consolidated financial statements

The following table presents the Company’s net revenue by product ($ in thousands):

			Three Months Ended June 30,												Six Months Ended June 30,
			2024						2023						2024						2023
ZEJULA			44,999						42,957						90,500						85,637
OPTUNE			12,584						13,692						25,064						27,034
QINLOCK			7,038						7,527						13,131						8,833
NUZYRA			12,295						4,636						22,208						10,105
VYVGART			23,190						52						36,352						52
Product revenue - net			100,106						68,864						187,255						131,661

Collaboration Revenue

Collaboration revenue was $0.4 million in both the three and six months ended June 30, 2024 and related to promotional activities in mainland China. We had no such collaboration revenue in the prior year periods.

7. Income Tax

No provision for income taxes has been required to be accrued because the Company is in a cumulative loss position for the periods presented.

The Company recorded a full valuation allowance against deferred tax assets of all its consolidated entities because all entities were in a cumulative loss position as of June 30, 2024 and December 31, 2023. No unrecognized tax benefits and related interest and penalties were recorded in the periods presented.

8. Loss Per Share

The following table presents the computation of the basic and diluted net loss per share ($ in thousands, except share and per share data):

			Three Months Ended June 30,												Six Months Ended June 30,
			2024						2023						2024						2023
Numerator:
Net loss			(80,277)						(120,895)						(133,748)						(170,039)
Denominator:
Weighted average number of ordinary shares - basic and diluted			975,937,790						964,817,310						974,541,780						963,140,360
Net loss per share - basic and diluted			(0.08)						(0.13)						(0.14)						(0.18)

As a result of the Company’s net loss in the three and six months ended June 30, 2024 and 2023, share options and non-vested restricted shares outstanding in the respective periods were excluded from the calculation of diluted loss per share as their inclusion would have been anti-dilutive.

			June 30,
			2024						2023
Share options			121,522,950						108,322,600
Non-vested restricted shares			35,535,640						33,462,670

11

---

Zai Lab Limited

Notes to the unaudited condensed consolidated financial statements

9. Borrowings

In February 2024, the Company entered into certain debt arrangements with the Bank of China, SPD Bank, and Ningbo Bank to support its working capital needs in mainland China. The following table presents the Company’s short-term debt as of June 30, 2024 ($ in thousands):

			Weighted average interest rate per annum						June 30, 2024
Bank of China Working Capital Loan			2.95		%				56,266
SPD Bank Working Capital Loan			3.45		%				14,032
Total short-term debt			3.05		%				70,298

Bank of China Working Capital Loan Facility

On February 5, 2024, the Company entered into an uncommitted facility letter with the Bank of China (Hong Kong) Limited (the “BOC HK”) pursuant to which the BOC HK will provide standby letters of credit for loans of up to $100.0 million for a term of one year. In connection with this agreement, the Company paid a one-time, non-refundable fee of $0.7 million in the first quarter of 2024. In accordance with this agreement, the Company also maintained restricted deposits of $100.0 million, which are presented as restricted cash-current on the condensed consolidated balance sheet, to secure the standby letters of credit. On February 6, 2024 and June 20, 2024, upon the Company’s application, the BOC HK provided standby letters of credit in favor of the Bank of China Pudong Development Zone Branch (the “BOC Pudong Branch”) for $50.0 million and $23.0 million, respectively, which are or may become payable by the Company’s wholly-owned subsidiary, Zai Lab (Shanghai) Co., Ltd. (“Zai Lab Shanghai”), and in the first half of 2024, Zai Lab Shanghai entered into working capital loan contracts with the BOC Pudong Branch for an aggregate loan of RMB500.0 million (approximately $69.8 million), of which an aggregate principal amount of RMB401.0 million (approximately $56.3 million) was outstanding as of June 30, 2024. Each working capital loan has a one-year term and is subject to a floating interest rate of approximately 2.95% initially, which is subject to adjustment every six months.

SPD Bank Working Capital Loan Facility

On February 6, 2024, the Company entered into a maximum-amount guarantee contract with the Shanghai Pudong Development Bank Co., Ltd. Zhangjiang Hi-Tech Park Sub-branch (the “SPD Bank”) pursuant to which the Company will guarantee working capital loans of up to RMB300.0 million (approximately $42.0 million) from SPD Bank to Zai Lab Shanghai over a three-year period. Zai Lab Shanghai entered into working capital loan contracts with SPD Bank under this debt facility in the first quarter of 2024, and the aggregate principal balance was RMB100.0 million (approximately $14.0 million) as of June 30, 2024. These working capital loans have a term of one year and are subject to a fixed interest rate of 3.45%.

Ningbo Bank Working Capital Loan Facility

On February 6, 2024, the Company’s wholly-owned subsidiary, Zai Lab (Suzhou) Co., Ltd. (“Zai Lab Suzhou”), entered into a maximum credit contract with Bank of Ningbo Co., Ltd. Suzhou Sub-branch (“Ningbo Bank”) as well as an Electronic Commercial Draft Discounting Master Agreement and Online Working Capital Loan Master Agreement (collectively, the “Ningbo Bank Agreements”). The Ningbo Bank Agreements permit Zai Lab Suzhou to utilize, including through discounting or working capital loan agreements and subject to the terms and conditions in related master agreements, up to RMB230.3 million (approximately $32.4 million), of which the Company is authorized to utilize up to RMB160.0 million (approximately $22.5 million). In connection with the arrangements described in the Ningbo Bank Agreements, Zai Lab Suzhou agreed to pledge interests in certain real property it owns in Suzhou. As of June 30, 2024, Zai Lab Suzhou has not entered into any discounting arrangements or working capital loans under this Ningbo Bank working capital loan facility.

12

---

Zai Lab Limited

Notes to the unaudited condensed consolidated financial statements

10. Other Current Liabilities

The following table presents the Company’s other current liabilities ($ in thousands):

			June 30, 2024						December 31, 2023
Accrued payroll			22,432						33,711
Accrued professional service fee			3,514						7,520
Payables for purchase of property and equipment			2,391						2,474
Accrued rebate to distributors			10,037						16,926
Tax payables			4,625						16,988
Other (i)			3,496						5,353
Total			46,495						82,972

(i)Other primarily includes accrued travel and business-related expenses.

11. Share-Based Compensation

During the six months ended June 30, 2024, the Company granted share options to purchase up to 20,739,400 ordinary shares and restricted shares representing 16,398,190 ordinary shares under its equity incentive plans. The share options granted have a contractual term of ten years. Share options granted since April 2023 generally vest ratably over a four-year period, and share options granted prior to April 2023 generally vest ratably over a five-year period, with 25% or 20% of the awards vesting on each anniversary of the grant date, respectively, subject to continued employment/service with the Company on the vesting date. The restricted shares granted generally vest ratably over a specified period on the anniversary of the grant date, subject to continued employment/service with the Company on the vesting date. For a description of the Company’s equity incentive plans and more details on the terms of the share-based awards, see Note 15 of the 2023 Annual Report.

The following table presents the share-based compensation expense that has been reported in the Company’s condensed consolidated statements of operations and comprehensive loss as follows ($ in thousands):

			Three Months Ended June 30,												Six Months Ended June 30,
			2024						2023						2024						2023
Selling, general and administrative			10,421						11,776						21,456						21,839
Research and development			8,217						8,735						15,162						15,333
Total			18,638						20,511						36,618						37,172

As of June 30, 2024, there was unrecognized share-based compensation expense related to unvested share options and unvested restricted shares of $98.1 million and $100.9 million, respectively, which the Company expects to recognize over a weighted-average period of 3.07 years and 2.90 years, respectively.

12. License and Collaboration Agreements

The Company has entered into various license and collaboration agreements with third parties to develop and commercialize product candidates. For a description of the material terms of the Company’s significant license and collaboration agreements, see Note 16 of the 2023 Annual Report. The following includes a description of milestone fees incurred in the six months ended June 30, 2024 under our significant license and collaboration agreements.

13

---

Zai Lab Limited

Notes to the unaudited condensed consolidated financial statements

License and Collaboration Agreement with Innoviva (SUL-DUR)

Under the terms of our license and collaboration agreement with Entasis Therapeutics Holdings Inc., a wholly owned subsidiary of Innoviva, Inc. (“Innoviva”), the Company recorded an $8.0 million regulatory milestone in the second quarter of 2024, which was capitalized as an intangible asset. As of June 30, 2024, the Company may be required to pay an additional aggregate amount of up to $80.6 million in development, regulatory, and sales-based milestones as well as certain royalties at tiered percentage rates ranging from high single digits to low-teens on annual net sales of the licensed products in the licensed territory.

License Agreement with BMS (Repotrectinib)

Under the terms of our license agreement with Turning Point Therapeutics, Inc., a company later acquired by Bristol Myers Squibb (“BMS”), the Company recorded a $25.0 million regulatory milestone in the second quarter of 2024, which was capitalized as an intangible asset. As of June 30, 2024, the Company may be required to pay an additional aggregate amount of up to $116.0 million in development, regulatory, and sales-based milestones as well as certain royalties at tiered percentage rates ranging from mid- to high-teens on annual net sales of the licensed product in the licensed territory.

13. Other Expenses (Income), Net

The following table presents the Company’s other expenses (income), net ($ in thousands):

			Three Months Ended June 30,												Six Months Ended June 30,
			2024						2023						2024						2023
Government grants			534						83						3,325						83
Loss on equity investments with readily determinable fair value			(10,035)						(1,744)						(5,147)						(1,304)
Others miscellaneous gain			558						256						2,240						1,050
Total			(8,943)						(1,405)						418						(171)

14. Restricted Net Assets

The Company’s ability to pay dividends may depend on the Company receiving distributions of funds from its Chinese subsidiaries. Relevant Chinese laws and regulations permit payments of dividends by the Company’s Chinese subsidiaries only out of its retained earnings, if any, as determined in accordance with Chinese accounting standards and regulations. The results of operations reflected in the unaudited condensed consolidated financial statements prepared in accordance with U.S. GAAP differ from those reflected in the statutory financial statements of the Company’s Chinese subsidiaries.

In accordance with the Company Law of the People’s Republic of China, a domestic enterprise is required to provide statutory reserves of at least 10% of its annual after-tax profit until such reserve has reached 50% of its respective registered capital based on the enterprise’s Chinese statutory accounts. A domestic enterprise may provide discretionary surplus reserve, at the discretion of the Board of Directors, from the profits determined in accordance with the enterprise’s Chinese statutory accounts. The aforementioned reserves can only be used for specific purposes and are not distributable as cash dividends. The Company’s Chinese subsidiaries were established as domestic enterprises and therefore are subject to the above-mentioned restrictions on distributable profits.

No appropriation to statutory reserves was made in the three and six months ended June 30, 2024 and 2023 because the Chinese subsidiaries had substantial losses during such periods.

As a result of these Chinese laws and regulations, subject to the limits discussed above that require annual appropriations of 10% of after-tax profit to be set aside, prior to payment of dividends, as a general reserve fund, the Company’s Chinese subsidiaries are restricted in their ability to transfer out a portion of their net assets.

Foreign exchange and other regulation in mainland China may further restrict the Company’s subsidiaries in mainland China from transferring out funds in the form of dividends, loans, and advances. As of June 30, 2024 and December 31, 2023, amounts restricted included the paid-in capital of the Company’s subsidiaries in mainland China and were $506.0 million.

15. Commitments and Contingencies

(a) Purchase Commitments

The Company’s commitments related to purchase of property and equipment contracted but not yet reflected in the unaudited condensed consolidated financial statements were $1.0 million as of June 30, 2024 and were expected to be incurred within one year.

(b) Legal Proceedings

The Company is not currently a party to any material legal proceedings.

(c) Indemnifications

In the normal course of business, the Company enters into agreements that indemnify others for certain liabilities that may arise in connection with a transaction or certain events and activities. To date, the Company has not paid any claims or been required to defend any action related to its indemnification obligations.

16. Subsequent Events

The Company identified an additional opportunity to access capital denominated in RMB through a debt facility with China Merchants Bank to support our working capital needs in mainland China. As a result, on July 5, 2024, the Company issued a maximum-amount irrevocable letter of guarantee to China Merchants Bank Co., Ltd., Shanghai Branch (“CMB”) pursuant to which the Company will guarantee working capital loans of up to RMB250.0 million (approximately $34.4 million) from CMB to our wholly-owned subsidiary, Zai Lab Shanghai, and Zai Lab Shanghai entered into a Credit Agreement with CMB with respect to the RMB250.0 million facility. The credit facility will be available for one year, and key terms of the specific working capital loans, including the amount, term, and interest rate, will be included in the specific transaction documents. To date, Zai Lab Shanghai has not entered into working capital loans under this facility.

14

---

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

You should read the following discussion and analysis of our financial condition and results of operations together with our 2023 Annual Report and our unaudited condensed consolidated financial statements and the accompanying notes for the three and six months ended June 30, 2024 included in Item 1. Financial Statements.

Overview

We are a patient-focused, innovative, commercial-stage, global biopharmaceutical company with a substantial presence in both Greater China and the United States. We are focused on discovering, developing, and commercializing products that address medical conditions with significant unmet needs in the areas of oncology, immunology, neuroscience, and infectious disease. We intend to leverage our competencies and resources to positively impact human health in Greater China and worldwide. We currently have five commercial products – ZEJULA®, OPTUNE, QINLOCK®, NUZYRA®, and VYVGART® – that have received marketing approval and that we have commercially launched in one or more territories in Greater China. OPTUNE refers to Tumor Treating Fields devices marketed under various brand names, including OPTUNE GIO® for glioblastoma multiforme (“GBM”). We also have multiple programs in late-stage product development and a number of ongoing pivotal trials across our portfolio.

Since our inception, we have incurred net losses and negative cash flows from our operations. Substantially all of our losses have resulted from funding our research and development programs and selling, general and administrative costs associated with our operations. Developing high quality product candidates requires significant investment in our research and development activities over a prolonged period of time, and a core part of our strategy is to continue making sustained investments in this area. Our ability to generate profits and positive cash flow from operations over the next several years depends upon our ability to successfully market our commercial products and to successfully expand the indications for these products and develop and commercialize our other product candidates. As discussed further below, we expect to continue to incur substantial costs related to our research and development and commercialization activities.

As we pursue our corporate strategic goals, we anticipate that our financial results will fluctuate from quarter to quarter and year to year depending in part on the balance between the success of our commercial products and the level of our research and development expenses. We cannot predict whether or when our product candidates will receive regulatory approval. Further, if we receive such regulatory approval, we cannot predict whether or when we may be able to successfully commercialize such products or whether or when such products may become profitable.

Recent Developments

Commercial Products

Net product revenue was $100.1 million for the second quarter of 2024, an increase of 45% compared to the prior year period, primarily driven by increased sales for VYVGART since its launch in September 2023 and NRDL listing in January 2024 and increased sales for ZEJULA and NUZYRA. The NRDL listing for ZEJULA as a maintenance treatment was renewed in the first quarter of 2024, and ZEJULA continues to be the leading PARP inhibitor in hospital sales for ovarian cancer in mainland China. Increased sales for NUZYRA were supported by the inclusion in the NRDL for its IV formulation in the first quarter of 2023 and for its oral formulation in the first quarter of 2024.

Product Candidates

We continued to advance our product candidates through our research and development activities, including the following developments with respect to our clinical trials and regulatory approvals:

Oncology

•Repotrectinib: In May 2024, the NMPA approved the New Drug Application (“NDA”) for repotrectinib for the treatment of adult patients with locally advanced or metastatic ROS1-positive non-small cell lung cancer (“NSCLC”). The approval was based on the global Phase I/II TRIDENT-1 study that evaluated repotrectinib in TKI naïve and TKI-pretreated patients with ROS1-positive NSCLC. We participated in the Greater China

15

---

portion of this study. In June 2024, our partner Bristol Myers Squibb (“BMS”) announced that the U.S. Food and Drug Administration (“FDA”) had granted accelerated approval of repotrectinib for the treatment of patients with NTRK-positive locally advanced or metastatic solid tumors.

•Niraparib (PARP): In July 2024, data from a Zai-supported study was published in Cell that provides new insights with potential to improve treatment of HRD-positive ovarian cancers, including through neoadjuvant monotherapy with niraparib and a combination of niraparib and ZL-1218, our investigational CCR8 antibody.

•Tisotumab Vedotin: In April 2024, our partner Pfizer Inc. and Genmab A/S announced that the FDA approved the supplemental Biologics License Application granting full approval for tisotumab vedotin (or TIVDAK®) for the treatment of patients with recurrent or metastatic cervical cancer with disease progression on or after chemotherapy. We are participating in the global Phase III innovaTV 301 trial and extension study in Greater China.

Immunology, Neuroscience, and Infectious Disease

•Efgartigimod: In May 2024, the NMPA accepted for priority review a supplemental Biologics License Application for efgartigimod alfa injection (subcutaneous injection) (“efgartigimod SC”) for the treatment of patients with chronic inflammatory demyelinating polyneuropathy (“CIDP”). In June 2024, our partner argenx announced that the FDA approved efgartigimod SC, under the brand name VYVGART® Hytrulo, for this indication.

In July 2024, the NMPA approved a Biologics License Application for efgartigimod SC as an add on to standard therapy for the treatment of adult patients with gMG who are anti-acetylcholine receptor (AChR) antibody positive.

•Sulbactam-Durlobactam (SUL-DUR): In May 2024, the NMPA approved the NDA for SUL-DUR for the treatment of adult patients with hospital-acquired bacterial pneumonia and ventilator-associated bacterial pneumonia caused by susceptible isolates of Acinetobacter baumannii-calcoaceticus complex.

•Xanomeline-Trospium (KarXT): In April 2024, our partner BMS presented new interim long-term data from the Phase III EMERGENT program for the treatment of schizophrenia. In the new interim analysis of long-term efficacy data from the Phase 3 EMERGENT-4 open-label extension trial, KarXT was associated with significant improvement in symptoms of schizophrenia across all efficacy measures at 52 weeks, and in the new pooled interim long-term safety and metabolic outcomes from the Phase III EMERGENT-4 and EMERGENT-5 trials, KarXT demonstrated a favorable long-term metabolic profile where most patients experienced stability or improvements on metabolic parameters over 52 weeks of treatment. We are conducting a registrational bridging study in mainland China.

In July 2024, Zai Lab joined the global Phase III ADEPT-2 study evaluating the safety and efficacy of KarXT for the treatment of Alzheimer’s disease with psychosis in Greater China.

•Early-Stage Global Pipeline: In May 2024, we initiated a global Phase II clinical trial evaluating the safety and efficacy of ZL-1102, an anti-IL-17 investigational therapy that we are internally developing, for the treatment of chronic plaque psoriasis.

Corporate Updates

We continue to enhance our portfolio through strategic partnerships and to strengthen our organizational structure to support the evolving needs of our business:

•Business Development: In July 2024, we entered into a strategic partnership and global license agreement with MabCare Therapeutics Co., Ltd. Through this collaboration, we expanded our global oncology pipeline with a next generation antibody-drug conjugate targeting ROR1, ZL-6301. ZL-6301 has the potential to be used in the treatment of solid tumors where ROR1 is commonly expressed and in hematological malignancies

16

---

where ROR1 is a validated target. ZL-6301 has demonstrated an encouraging pre-clinical profile, and it is currently in the IND-enabling stage. We plan to focus on advancing its global development.

•Organizational Updates: In April 2024, Andrew Zhu joined Zai Lab as our Chief Commercial Officer in Greater China. Mr. Zhu’s rich experience in building innovative business models and resource integration will help us further enhance our commercial operations and drive sales and profit growth across Greater China. He joins us from Simcere Zaiming, where he most recently served as Chief Operating Officer responsible for the commercial and pharmaceutical business. He previously served in various operational, sales, and marketing leadership roles at leading global biopharmaceutical companies, including AstraZeneca, Roche, Sanofi, and BMS. In addition, Dr. Rafael Amado was appointed President, Head of Global Research and Development, expanding his role to encompass R&D efforts all of our therapeutic areas upon Dr. Harald Reinhart’s retirement on June 30, 2024.

Factors Affecting Our Results of Operations

Our Commercial Products

We generate product revenue through the sale of our commercial products in Greater China, net of any related sales returns and rebates to distributors. Our cost of product revenue mainly consists of the costs of manufacturing ZEJULA and NUZYRA, costs of purchasing OPTUNE, QINLOCK, and VYVGART from our collaboration partners, any royalty fees incurred as a result of sales of our commercial products under our license and collaboration agreements, and amortization of any sales-based milestone fees incurred under our license and collaboration agreements. We expect our product revenue to increase in coming years as we continue to focus on increasing patient access to our existing commercial products, such as through NRDL listing or increased supplemental insurance coverage in the private-pay market, and as we launch additional commercial products, if and when we obtain required regulatory approvals. We expect our cost of product revenue to increase as the volume of products sold increases.

Research and Development Expenses

We believe our ability to successfully develop product candidates will be the primary factor affecting our long-term competitiveness, as well as our future growth and development. Developing high quality product candidates requires a significant investment of resources over a prolonged period of time. We are committed to advancing and expanding our pipeline of potential best-in-class and first-in-class products, such as through clinical and pre-clinical trials and business development activities. As a result, we expect to continue making significant investments in research and development, including internal discovery activities.

Elements of research and development expenditures primarily include:

•payroll and other related costs of personnel engaged in research and development activities;

•fees for exclusive development rights of products granted to the Company;

•costs related to pre-clinical testing of the Company’s technologies and clinical trials, such as payments to contract research organizations (“CROs”) and contract manufacturing organizations (“CMOs”), investigators, and clinical trial sites that conduct our clinical studies; and

•costs to produce the product candidates, including raw materials and supplies, product testing, depreciation, and facility-related expenses.

Selling, General, and Administrative Expenses

Our selling, general, and administrative expenses consist primarily of personnel compensation and related costs, including share-based compensation for commercial and administrative personnel. Other selling, general, and administrative expenses include product distribution and promotion costs, and professional service fees for legal, intellectual property, consulting, auditing, and tax services as well as other direct and allocated expenses for rent and maintenance of facilities, insurance, and other supplies used in selling, general, and administrative activities. We expect

17

---

these costs to continue to be significant to support sales of our commercial products and preparation to launch and subsequent sales of additional product candidates if and when approved.

Our Ability to Commercialize Our Product Candidates

We have multiple product candidates in late-stage clinical development and various others in clinical and pre-clinical development in Greater China and the United States. Our ability to generate revenue from our product candidates is dependent on our receipt of regulatory approvals for and successful commercialization of such product candidates, which may not occur. Certain of our product candidates may require additional pre-clinical and/or clinical development, regulatory approvals in multiple jurisdictions, manufacturing supply, and significant marketing efforts before we generate any revenue from product sales.

License and Collaboration Arrangements

Our results of operations have been, and will continue to be, affected by our license and collaboration agreements. In accordance with these agreements, we may be required to make upfront payments and milestone payments upon the achievement of certain development, regulatory, and sales-based milestones for the relevant products as well as certain royalties at tiered percentage rates based on annual net sales of the licensed products in the licensed territories. As of June 30, 2024, we may be required to pay development and regulatory milestone payments of up to an additional aggregate amount of $294.5 million for our current clinical programs and $561.2 million for other programs, and such payments are contingent on the progress of our product candidates prior to commercialization. As of June 30, 2024, we also may be required to pay sales-based milestone payments of up to an additional aggregate amount of $1,980.0 million as well as certain royalties at tiered percentage rates on annual net sales that are contingent on product performance. If these milestones or royalties do occur, we view related payments as favorable because such payments signify that the product or product candidate is achieving higher sales levels or advancing toward potential commercial launch.

18

---

Results of Operations

In this section, we discuss our results of operations for the three and six months ended June 30, 2024 compared to the same periods in 2023.

The following table presents our results of operations ($ in thousands):

						Three Months Ended June 30,												Change												Six Months Ended June 30,												Change
						2024						2023						$						%						2024						2023						$						%
Revenues
Product revenue, net						100,106						68,864						31,242						45		%				187,255						131,661						55,594						42		%
Collaboration revenue						398						—						398						NM						398						—						398						NM
Total revenues						100,504						68,864						31,640						46		%				187,653						131,661						55,992						43		%
Expenses
Cost of product revenue						(35,148)						(23,763)						(11,385)						48		%				(68,767)						(45,100)						(23,667)						52		%
Cost of collaboration revenue						(85)						—						(85)						NM						(85)						—						(85)						NM
Research and development						(61,625)						(76,682)						15,057						(20)		%				(116,270)						(125,153)						8,883						(7)		%
Selling, general, and administrative						(79,710)						(67,920)						(11,790)						17		%				(148,904)						(130,430)						(18,474)						14		%
Gain on sale of intellectual property						—						10,000						(10,000)						(100)		%				—						10,000						(10,000)						(100)		%
Loss from operations						(76,064)						(89,501)						13,437						(15)		%				(146,373)						(159,022)						12,649						(8)		%
Interest income						9,330						10,090						(760)						(8)		%				18,988						20,321						(1,333)						(7)		%
Interest expense						(492)						—						(492)						NM						(605)						—						(605)						NM
Foreign currency losses						(4,108)						(40,079)						35,971						(90)		%				(6,176)						(31,167)						24,991						(80)		%
Other (expenses) income, net						(8,943)						(1,405)						(7,538)						537		%				418						(171)						589						(344)		%
Loss before income tax						(80,277)						(120,895)						40,618						(34)		%				(133,748)						(170,039)						36,291						(21)		%
Income tax expense						—						—						—						—		%				—						—						—						—		%
Net loss						(80,277)						(120,895)						40,618						(34)		%				(133,748)						(170,039)						36,291						(21)		%

NM - Not Meaningful

Revenues

Product Revenue, Net

The following table presents the components of the Company’s product revenue ($ in thousands):

						Three Months Ended June 30,												Change												Six Months Ended June 30,												Change
						2024						2023						$						%						2024						2023						$						%
Product revenue - gross						106,611						75,010						31,601						42		%				199,723						146,222						53,501						37		%
Less: Rebates and sales returns						(6,505)						(6,146)						(359)						6		%				(12,468)						(14,561)						2,093						(14)		%
Product revenue - net						100,106						68,864						31,242						45		%				187,255						131,661						55,594						42		%

Our product revenue is derived from the sales of our commercial products primarily in mainland China, net of sales returns and rebates to distributors with respect to the sales of these products.

Our net product revenue increased by $31.2 million and $55.6 million in the three and six months ended June 30, 2024, respectively, primarily driven by increased sales for VYVGART since its launch in September 2023 and NRDL listing in January 2024. Net product revenue growth was also supported by increased sales volumes for ZEJULA and NUZYRA in the three and six months ended June 30, 2024 and for QINLOCK in the six months ended June 30, 2024. ZEJULA sales remained strong as it continued to be the leading PARP inhibitor in hospital sales for ovarian cancer in mainland China following the renewal of its NRDL listing as a maintenance treatment in the first quarter of 2024. The growth in NUZYRA sales was supported by the inclusion in the NRDL for its IV formulation in the first quarter of 2023

19

---

and for its oral formulation in the first quarter of 2024. Similarly, QINLOCK sales were supported by its inclusion in the NRDL in the first quarter of 2023.

The following table presents net revenue by product ($ in thousands):

						Three Months Ended June 30,												Change												Six Months Ended June 30,												Change
						2024						2023						$						%						2024						2023						$						%
ZEJULA						44,999						42,957						2,042						5		%				90,500						85,637						4,863						6		%
OPTUNE						12,584						13,692						(1,108)						(8)		%				25,064						27,034						(1,970)						(7)		%
QINLOCK						7,038						7,527						(489)						(6)		%				13,131						8,833						4,298						49		%
NUZYRA						12,295						4,636						7,659						165		%				22,208						10,105						12,103						120		%
VYVGART						23,190						52						23,138						44496		%				36,352						52						36,300						69808		%
Total product revenue, net						100,106						68,864						31,242						45		%				187,255						131,661						55,594						42		%

Cost of Product Revenue

Cost of product revenue increased by $11.4 million and $23.7 million in the three and six months ended June 30, 2024, respectively, primarily due to increasing sales volumes and shifts in product sales mix.

Collaboration Revenue and Cost of Collaboration Revenue

Collaboration revenue was $0.4 million and cost of collaboration revenue was $0.1 million in both the three and six months ended June 30, 2024, and related to promotional activities in mainland China. We had no such collaboration revenue in the prior year periods.

Research and Development Expenses

The following table presents the components of our research and development expenses ($ in thousands):

						Three Months Ended June 30,												Change												Six Months Ended June 30,												Change
						2024						2023						$						%						2024						2023						$						%
Personnel compensation and related costs						31,209						29,378						1,831						6		%				59,217						58,034						1,183						2		%
Licensing fees						—						18,282						(18,282)						(100)		%				—						19,282						(19,282)						(100)		%
CROs/CMOs/Investigators expenses						24,305						23,626						679						3		%				44,209						36,065						8,144						23		%
Other costs						6,111						5,396						715						13		%				12,844						11,772						1,072						9		%
Total						61,625						76,682						(15,057)						(20)		%				116,270						125,153						(8,883)						(7)		%

Research and development expenses decreased by $15.1 million and $8.9 million in the three and six months ended June 30, 2024, respectively, primarily due to:

•a decrease of $18.3 million and $19.3 million, respectively, in licensing fees as a result of decreased upfront and milestone payments for our license and collaboration agreements; partially offset by

•an increase of $1.4 million and $9.2 million, respectively, in CROs/CMOs/Investigators expenses and other costs related to ongoing and newly initiated clinical trials.

20

---

The following table presents our research and development expenses by program ($ in thousands):

						Three Months Ended June 30,												Change												Six Months Ended June 30,												Change
						2024						2023						$						%						2024						2023						$						%
Clinical programs						21,348						32,462						(11,114)						(34)		%				40,136						44,989						(4,853)						(11)		%
Pre-clinical programs						3,139						10,758						(7,619)						(71)		%				5,188						13,239						(8,051)						(61)		%
Unallocated research and development expenses						37,138						33,462						3,676						11		%				70,946						66,925						4,021						6		%
Total						61,625						76,682						(15,057)						(20)		%				116,270						125,153						(8,883)						(7)		%

Research and development expenses attributable to clinical programs decreased by $11.1 million in the three months ended June 30, 2024 primarily driven by a decrease of $8.3 million in licensing fees and $2.8 million in CROs/CMOs/Investigators expenses. Research and development expenses attributable to pre-clinical programs decreased by $7.6 million in the three months ended June 30, 2024 primarily due to a decrease of $10.0 million in licensing fees, offset by an increase of $2.4 million in CROs/CMOs/Investigators expenses related to newly initiated studies and progress of existing studies.

Research and development expenses attributable to clinical programs decreased by $4.9 million in the six months ended June 30, 2024 primarily driven by a decrease of $8.3 million in licensing fees, offset by an increase of $3.4 million in CROs/CMOs/Investigators expenses due to newly initiated studies and progress of existing studies. Research and development expenses attributable to pre-clinical programs decreased by $8.1 million in the six months ended June 30, 2024 primarily due to a decrease of $11.0 million in licensing fees, offset by an increase of $2.9 million in CROs/CMOs/Investigators expenses related to newly initiated studies and progress of existing studies.

Although we manage our external research and development expenses by program, we do not allocate our internal research and development expenses by program because our employees and internal resources may be engaged in projects for multiple programs at any given time.

Selling, General, and Administrative Expenses

The following table presents our selling, general and administrative expenses by program ($ in thousands):

						Three Months Ended June 30,												Change												Six Months Ended June 30,												Change
						2024						2023						$						%						2024						2023						$						%
Personnel compensation and related costs						48,279						42,874						5,405						13		%				94,173						83,788						10,385						12		%
Professional service fees						4,951						5,793						(842)						(15)		%				9,054						14,348						(5,294)						(37)		%
Other costs						26,480						19,253						7,227						38		%				45,677						32,294						13,383						41		%
Total						79,710						67,920						11,790						17		%				148,904						130,430						18,474						14		%

Selling, general, and administrative expenses increased by $11.8 million and $18.5 million in the three and six months ended June 30, 2024, respectively, primarily due to:

•an increase of $7.2 million and $13.4 million in other costs, respectively, primarily related to higher general selling expenses for VYVGART which was launched in September 2023.

•an increase of $5.4 million and $10.4 million in personnel compensation and related costs, respectively, primarily driven by headcount growth mainly to support VYVGART; partially offset by

•a decrease of $0.8 million and $5.3 million in professional service fees, respectively, primarily related to decreased legal, finance, and human resources administrative expenses.

21

---

Gain on Sale of Intellectual Property

We had a gain on sale of intellectual property of $10.0 million in the second quarter of 2023 in connection with our sale of certain patent rights and related know-how to a third party. We had no such gain or loss in the current year periods.

Interest Income

Interest income decreased by $0.8 million and $1.3 million in the three and six months ended June 30, 2024, respectively, primarily due to decreased cash and cash equivalents.

Interest Expense

Interest expense increased by $0.5 million and $0.6 million in the three and six months ended June 30, 2024, respectively, primarily due to interest expense on short-term debt we entered into in the first half year of 2024. We had no such interest expense in the prior year periods.

Foreign Currency Losses

Foreign currency losses decreased by $36.0 million and $25.0 million in the three and six months ended June 30, 2024, respectively, due to the decreased level of depreciation of the RMB against the U.S. dollar.

Other (Expenses) Income, Net

Other expenses, net increased by $7.5 million in the three months ended June 30, 2024, primarily due to an increase of $8.3 million in loss of our equity investment in MacroGenics, Inc as a result of changes in its stock price.

Other income, net was $0.4 million in the six months ended June 30, 2024, compared to other expenses, net of $0.2 million in the six months ended June 30, 2023, primarily due to an increase of $3.2 million in government grants, an increase of $1.2 million in other miscellaneous gain primarily driven by an increase in sublease rental income, offset by an increase of $3.8 million in loss of our equity investment in MacroGenics, Inc as a result of changes in its stock price.

Income Tax Expense

Income tax expense was nil in both the three and six months ended June 30, 2024 and 2023.

Net Loss

Net loss was $80.3 million in the three months ended June 30, 2024, or a loss per ordinary share attributable to common stockholders of $0.08 (or loss per ADS of $0.82), compared to a net loss of $120.9 million in the three months ended June 30, 2023, or a loss per ordinary share of $0.13 (or loss per ADS of $1.25).

Net loss was $133.7 million in the six months ended June 30, 2024, or a loss per ordinary share attributable to common stockholders of $0.14 (or loss per ADS of $1.37), compared to a net loss of $170.0 million in the six months ended June 30, 2023, or a loss per ordinary share of $0.18 (or loss per ADS of $1.77).

Critical Accounting Policies and Significant Judgments and Estimates

We prepare our financial statements in conformity with U.S. GAAP, which requires management to make judgments, estimates, and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses, and related disclosures. Some of those judgments can be subjective and complex. Actual results could differ from our estimates.

Our most critical accounting policies and estimates, including those that require the most difficult, subjective, or complex judgments and are the most inherently uncertain, are described below.

22

---

Revenue Recognition

We sell our products to distributors (our customers), who ultimately sell the products to healthcare providers, primarily in mainland China. We recognize revenue when the performance obligations are satisfied upon the product’s delivery to distributors.

We offer rebates to our distributors to compensate the distributors consistent with pharmaceutical industry practices. We are required to establish a provision for rebates in the same period the related product sales are recognized. The estimated amount of rebates, if any, is recorded as a reduction of revenue.

Significant judgments are required in making these estimates. In determining the appropriate accrual amount, we consider our contracted rates, sales volumes, levels of distributor inventories, and historical experiences and trends. If actual results vary from our estimates or our expectations change, we will adjust these estimates accordingly, which would affect net product revenue and earnings in the period such variances become expected or known.

Research and Development Expenses

We have a significant amount of research and development expenses, including with respect to pre-clinical and clinical trials for our product candidates. Such costs are expensed as incurred when they have no alternative future uses.

We contract with third parties to perform various pre-clinical and clinical trial activities on our behalf in the ongoing development of our product candidates. Expenses related to pre-clinical and clinical trial activities are accrued based on the Company’s estimates of the actual services performed by the third parties, such as CROs and CMOs.

Significant judgments are required in estimating the actual services performed by the third parties for the respective period and the related expense accruals. In determining the appropriate accrual, we consider a variety of factors, including contractual requirements with respect to services to be provided, related rates, and our assessment of services performed during the period and progress with respect to any contractual milestones when we have not yet been invoiced or otherwise notified by third parties of actual costs. If the actual status and timing of services performed vary from our estimates, our reported expenses and earnings for the corresponding period may be affected.

Share-Based Compensation

We grant share-based awards, including share options and restricted shares, to eligible employees, non-employees, and directors. Such share-based awards are measured at grant date fair value.

Significant assumptions are required in determining the fair value of share options, which we estimate using the Black-Scholes option valuation model. These assumptions include: (i) the expected volatility of our ADS price, (ii) the periods of time over which grantees are expected to hold their options prior to exercise (expected term), (iii) the expected dividend yield on our ADSs, and (iv) risk-free interest rates. Since we do not have sufficient trading history since our September 2017 initial public offering on Nasdaq to cover the expected term of our share options, we estimate expected volatility based on movements in the share price of certain companies we consider comparable over the most recent equivalent historical period. Since we do not have sufficient historical information to develop reasonable expectations about future exercise patterns and post-vesting employment termination behavior, the expected term is derived from the average midpoint between the weighted average vesting and the contractual term, also known as the simplified method. The expected dividend yield is zero as we have never paid dividends and do not currently anticipate paying any in the foreseeable future, and risk-free interest rates are based on quoted U.S. Treasury rates for securities with maturities approximating the expected term. If actual results vary from our estimates or our expectations change, our reported expenses and earnings for the corresponding period may be affected.

Income Taxes

We recognize deferred tax assets and liabilities for temporary differences between the financial statement and income tax bases of assets and liabilities, which are measured using enacted tax rates and laws that will be in effect when the differences are expected to reverse. A valuation allowance is provided when it is more likely than not that some or all

23

---

of a deferred tax asset will not be realized. Significant judgements are required when evaluating tax positions in accordance with ASC 740, Income Taxes.

We recognize in our financial statements the benefit of a tax position if the tax position is “more likely than not” to prevail based on the facts and technical merits of the position. Tax positions that meet the “more likely than not” recognition threshold are measured at the largest amount of tax benefit that has a greater than fifty percent likelihood of being realized upon settlement. We estimate our liability for unrecognized tax benefits which are periodically assessed and may be affected by changing interpretations of laws, rulings by tax authorities, changes and/or developments with respect to tax audits, and the expiration of the applicable statute of limitations. The ultimate outcome for a particular tax position may not be determined with certainty prior to the conclusion of a tax audit and, in some cases, appeal or litigation process.

We consider positive and negative evidence when determining whether some or all of our deferred tax assets will not be realized. This assessment considers various factors, including the nature, frequency, and severity of current and cumulative losses, forecasts of future profitability, the duration of statutory carry-forward periods, our historical results of operations, and our tax planning strategies. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Our estimates may be affected by changing interpretations of laws, rulings by tax authorities, changes and/or developments with respect to tax audits, and expiration of the statute of limitations. If actual benefits vary from our estimates or our expectations change, we will adjust the recognition and measurement estimates accordingly, which would affect reported expenses and earnings in the corresponding period.

Liquidity and Capital Resources

To date, we have financed our activities primarily through private placements, our September 2017 initial public offering and various follow-on offerings on Nasdaq, and our September 2020 secondary listing and initial public offering on the Hong Kong Stock Exchange. In addition, we have raised approximately $164.6 million in private equity financing and approximately $2,462.7 million in net proceeds after deducting underwriting commissions and the offering expenses payable by us in our initial public offering and subsequent follow-on offerings on Nasdaq and our initial public offering on the Hong Kong Stock Exchange. Our operations have consumed substantial amounts of cash since inception. The net cash used in our operating activities was $132.3 million and $128.0 million in the six months ended 2024 and 2023, respectively. For information on our research and development activities and related expenditures see the Research and Development Expenses, Selling, General, and Administrative Expenses, License and Collaboration Arrangements, and Results of Operations sections in above. In addition, as of June 30, 2024, we had commitments for capital expenditures of $1.0 million, mainly for the purpose of plant construction and installation.

As of June 30, 2024, we had cash and cash equivalents, current restricted cash, and short-term investments of $730.0 million, which we expect will enable us to meet our cash requirements including the funding of operating expenses, capital expenditures, and debt obligations for at least the next 12 months.

Although we believe that we have sufficient capital to fund our operations for at least the next twelve months, we may, from time to time, identify opportunities to access capital through debt arrangements on favorable commercial terms. In February 2024, we entered into three such debt arrangements with Chinese financial institutions that allow certain of our subsidiaries to borrow up to approximately $164.5 million (or RMB1,171.7 million) to support our working capital needs in mainland China. As of June 30, 2024, we had short-term debt of approximately $70.3 million (or RMB501.0 million) pursuant to these debt arrangements. In addition, in July 2024, we entered into an additional such debt arrangement with a Chinese financial institution that would allow Zai Lab Shanghai to borrow up to RMB250.0 million (approximately $34.4 million) to support our working capital needs in mainland China. These debt arrangements will provide us with additional capital capacity that gives us enhanced flexibility to execute on our corporate strategic goals. For more information, see Note 9 and Note 16.

We may consider, or we may ultimately need, additional funding sources to bring to fruition our strategic objectives, and there can be no assurances that such funding will be made available to us on acceptable terms or at all.

24

---

The following table presents information regarding our cash flows ($ in thousands):

						Six Months Ended June 30,												Change
						2024						2023						$
Net cash used in operating activities						(132,279)						(127,989)						(4,290)
Net cash provided by (used in) investing activities						2,446						(11,252)						13,698
Net cash provided by (used in) financing activities						69,870						(5,379)						75,249
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash						(137)						(3,707)						3,570
Net decrease in cash, cash equivalents and restricted cash						(60,100)						(148,327)						88,227

Net Cash Used in Operating Activities

Net cash used in operating activities increased by $4.3 million in the six months ended June 30, 2024, primarily due to a decrease of $31.4 million in net changes in operating assets and liabilities, a decrease of $9.2 million in adjustments to reconcile net loss to net cash used in operating activities, partially offset by a decrease of $36.3 million in net loss.

Net Cash Provided by (Used in) Investing Activities

Net cash provided by investing activities was $2.4 million in the six months ended June 30, 2024, compared to net cash used in investing activities of $11.3 million in the six months ended June 30, 2023. This shift was primarily due to a decrease of $100.0 million in purchases of short-term investments, and a decrease of $3.5 million in purchases of property and equipment, partially offset by a decrease of $68.2 million in proceeds from the maturity of short-term investments, an increase of $11.5 million from acquisition of intangible assets as we made a sales-based milestone payment which was capitalized as intangible assets in the fourth quarter of 2023, and a decrease of $10.0 million in proceeds from sale of intellectual property.

Net Cash Provided by (Used in) Financing Activities

Net cash provided by financing activities was $69.9 million in the six months ended June 30, 2024, compared to net cash used in financing activities of $5.4 million in the six months ended June 30, 2023. This shift was primarily due to $69.8 million in short-term debt proceeds net of related issuance costs as we entered into certain debt arrangements in the first half of 2024, partially offset by decreases of $7.1 million in taxes paid related to settlement of equity awards and $1.7 million in proceeds from exercises of stock options.

Recently Issued Accounting Standards

For more information regarding recently issued accounting standards, see Part II – Item 8. Financial Statements and Supplementary Data – Recent Accounting Pronouncements in our 2023 Annual Report. The Company has not adopted any new accounting standards in the six months ended June 30, 2024.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

We are exposed to market risk including foreign exchange risk and credit risk.

Foreign Exchange Risk

Renminbi, or RMB, is not a freely convertible currency. The State Administration of Foreign Exchange, under the authority of the People’s Bank of China (“PBOC”), controls the conversion of RMB into foreign currencies. The value of RMB is subject to changes in central government policies and to international economic and political developments affecting supply and demand in the China Foreign Exchange Trading System market. The cash and cash equivalents of the Company included aggregated amounts of $21.1 million and $25.1 million, which were denominated in RMB, representing 3% of the cash and cash equivalents as of both June 30, 2024 and December 31, 2023, respectively.

25

---

While our financial statements are presented in U.S. dollars, our business mainly operates in mainland China with a significant portion of our transactions settled in RMB, and as such, we do not believe that we currently have significant direct foreign exchange risk and have not used derivative financial instruments to hedge our exposure to such risk. Although, in general, our exposure to foreign exchange risks should be limited, the value of your investment in our ADSs and ordinary shares will be affected by the exchange rate between the U.S. dollar and the RMB and between the HK dollar and the RMB, respectively, because the value of our business is effectively denominated in RMB, while ADSs and ordinary shares are traded in U.S. dollars and HK dollars, respectively.

The value of the RMB against the U.S. dollar and other currencies may fluctuate and is affected by, among other things, changes in Greater China’s political and economic conditions. The conversion of RMB into foreign currencies, including U.S. dollars, has been based on rates set by the PBOC.

The value of our ADSs and our ordinary shares will be affected by the foreign exchange rates between U.S. dollars, HK dollars, and the RMB. For example, to the extent that we need to convert U.S. dollars or HK dollars into RMB for our operations or if any of our arrangements with other parties are denominated in U.S. dollars or HK dollars and need to be converted into RMB, appreciation of the RMB against the U.S. dollar or the HK dollar would have an adverse effect on the RMB amount we receive from the conversion. Conversely, if we decide to convert RMB into U.S. dollars or HK dollars for the purpose of making payments for dividends on ordinary shares or ADSs or for other business purposes, appreciation of the U.S. dollar or the HK dollar against the RMB would have a negative effect on the conversion amounts available to us.

Since 1983, the Hong Kong Monetary Authority (“HKMA”) has pegged the HK dollar to the U.S. dollar at the rate of approximately HK$7.80 to US$1.00. However, there is no assurance that the HK dollar will continue to be pegged to the U.S. dollar or that the HK dollar conversion rate will remain at HK$7.80 to US$1.00. If the HK dollar conversion rate against the U.S. dollar changes and the value of the HK dollar depreciates against the U.S. dollar, our assets denominated in HK dollars will be adversely affected. Additionally, if the HKMA were to repeg the HK dollar to, for example, the RMB rather than the U.S. dollar, or otherwise restrict the conversion of HK dollars into other currencies, then our assets denominated in HK dollars will be adversely affected.

Credit Risk

Financial instruments that are potentially subject to significant concentration of credit risk consist of cash and cash equivalents, short-term investments, accounts receivable, and notes receivable.

The carrying amounts of cash and cash equivalents and short-term investments represent the maximum amount of losses due to credit risk. As of June 30, 2024 and December 31, 2023, we had cash and cash equivalents of $630.0 million and $790.2 million, and short-term investments of nil and $16.3 million, respectively. As of June 30, 2024 and December 31, 2023, all of our cash and cash equivalents and short-term investments were held by major financial institutions located in mainland China and international financial institutions outside of mainland China which we believe are of high credit quality and for which we monitor continued credit worthiness.

Accounts receivable are typically unsecured and are derived from product revenue and collaborative arrangements. We manage credit risk related to our accounts receivable through ongoing monitoring of outstanding balances and limiting the amount of credit extended based upon payment history and credit worthiness. Historically, we have collected receivables from customers within the credit terms with no significant credit losses incurred. As of June 30, 2024, our two largest customers accounted for approximately 23% of our total accounts receivable collectively.

Certain accounts receivable balances are settled in the form of notes receivable. As of June 30, 2024, such notes receivable included bank acceptance promissory notes that are non-interest bearing and due within six months. These notes receivable were used to collect the receivables based on an administrative convenience, given these notes are readily convertible to known amounts of cash. In accordance with the sales agreements, whether to use cash or bank acceptance promissory notes to settle the receivables is at our discretion, and this selection does not impact the agreed contractual purchase prices.

26

---

Item 4. Controls and Procedures

Management’s Evaluation of Our Disclosure Controls and Procedures

Our management, including our Chief Executive Officer and Chief Financial Officer, performed an evaluation of the effectiveness of our disclosure controls and procedures (as defined in Exchange Act Rule 13a-15(e)) as of the end of the period covered by this report. Our disclosure controls and procedures are designed to ensure that the information required to be disclosed in the reports that we file or furnish under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, to allow timely decisions regarding required disclosure. Any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objective. Based upon that evaluation, our management has concluded that, as of June 30, 2024, our disclosure controls and procedures were effective.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting (as such item is defined in Rules 13a-15(f)) during the fiscal quarter ended June 30, 2024 that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

27

---

PART II - OTHER INFORMATION

Item 1. Legal Proceedings.

We may be, from time to time, subject to claims and suits arising in the ordinary course of business. We are not currently a party to any material legal or administrative proceedings.

Item 1A. Risk Factors.

We are subject to risks and uncertainties that could, directly or indirectly, adversely affect our business, results of operations, financial condition, liquidity, cash flows, strategies, and/or prospects. There have been no material changes in our risk factors from those disclosed in the “Risk Factors” section of our 2023 Annual Report.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

None.

Item 3. Defaults Upon Senior Securities.

None.

Item 4. Mine Safety Disclosures.

None.

Item 5. Other Information.

Other than as described below, during the period covered by this report, none of the Company’s directors or executive officers has adopted or terminated a Rule 10b5-1 trading arrangement or a non-Rule 10b5-1 trading arrangement (each as defined in Item 408 of Regulation S-K).

On June 6, 2024, Richard Gaynor, one of the Company’s directors, adopted a new written Rule 10b5-1 trading arrangement for the disposition of up to 5,000 of the Company’s ADSs, each representing ten of the Company’s ordinary shares, to cover tax obligations in connection with the vesting of a previously granted restricted stock award. This Rule 10b5-1 trading arrangement is scheduled to terminate no later than July 7, 2025.

28

---

Item 6. Exhibits.

Exhibit Index

Exhibit Number						Exhibit Title
10.1#						Zai Lab Limited 2024 Equity Incentive Plan (incorporated by reference to Exhibit 10.1 to our Current Report on Form 8-K (File No. 001-38205) filed on June 18, 2024)
10.2#						Form Restricted Share Unit Award Agreement
10.3#						Form Restricted Stock Award Agreement
10.4#						Form Non-Statutory Stock Option Award Agreement
10.5+						Addendum to Collaboration and License Agreement between argenx BV and Zai Auto Immune (Hong Kong) Limited dated June 30, 2024
10.6+						Unofficial English Translation of Maximum-Amount Irrevocable Letter of Guarantee, dated as of July 5, 2024, issued by Zai Lab Limited to China Merchants Bank Co., Ltd., Shanghai Branch (incorporated by reference to Exhibit 10.1 to our Current Report on Form 8-K (File No. 001-38205) filed on July 9, 2024)
10.7+						Unofficial English Translation of Credit Agreement, dated as of July 5, 2024, by and between Zai Lab (Shanghai) Co., Ltd. and China Merchants Bank Co., Ltd., Shanghai Branch (incorporated by reference to Exhibit 10.2 to our Current Report on Form 8-K (File No. 001-38205) filed on July 9, 2024)
31.1						Certification of Chief Executive Officer Required by Exchange Act Rule 13a-14(a)
31.2						Certification of Chief Financial Officer Required by Exchange Act Rule 13a-14(a)
32.1						Certification of Chief Executive Officer Required by 18 U.S.C. Section 1350
32.2						Certification of Chief Financial Officer Required by 18 U.S.C. Section 1350
101.INS*						Inline XBRL Instance Document-the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
101.SCH*						Inline XBRL Taxonomy Extension Schema Document
101.CAL*						Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB*						Inline XBRL Taxonomy Extension Label Linkbase Document
101.PRE*						Inline XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF*						Inline XBRL Taxonomy Extension Definitions Linkbase Document
104*						Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

# Management contract or compensatory plan, contract, or arrangement

+ Portions of this exhibit have been redacted pursuant to Item 601(b)(10)(iv) of Regulation S-K

29

---

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

			ZAI LAB LIMITED
Dated: August 6, 2024			By:			/s/ Yajing Chen
			Name:			Yajing Chen
			Title:			Chief Financial Officer
						(Principal Financial and Accounting Officer)

30

---

---

---

---

---

---

---

---

---

---

---

---

---

---

---

---