(Mark One)☒ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended December 31, 2025OR☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934FOR THE TRANSITION PERIOD FROMTOCommission File Number 001-37923 CRISPR THERAPEUTICS AG (Exact name of registrant as specified in its charter) Securities registered pursuant to Section 12(b) of the Act: Securities registered pursuant to Section 12(g) of the Act:None Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. YES☒NO☐ Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. YES☐NO☒ 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 of1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject tosuch 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 Rule405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required tosubmit such files). YES☒NO☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, oran emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerginggrowth company” in Rule 12b-2 of the Exchange Act. Large accelerated filer☒Non-accelerated filer☐Emerging growth company☐ Accelerated filer☐Smaller reporting company☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying withany new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internalcontrol over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm thatprepared or issued its audit report.☒ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant includedin the filing reflect the correction of an error to previously issued financial statements.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensationreceived by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). YES☐NO☒ The aggregate market value of the common shares held by non-affiliates of the Registrant was approximately $4.1 billion, based on the closingprice on the Nasdaq Global Market of the Registrant’s common shares on June 30, 2025 (the last trading day of the Registrant’s second fiscalquarter of 2025). The number of the Registrant’s common shares outstanding as of February 10, 2026 was 95,985,312. DOCUMENTS INCORPORATED BY REFERENCE Portions of the Registrant’s Definitive Proxy Statement relating to the 2026 Annual General Meeting of Shareholders, which the Registrant intendsto file with the Securities and Exchange Commission pursuant to Regulation 14A within 120 days after the end of the Registrant’s fiscal year endedDecember 31, 2025, are incorporated by reference into Part III of this Report. Table of Contents PART I Item 1.Business1Item 1A.Risk Factors44Item 1B.Unresolved Staff Comments93Item 1C.Cybersecurity93Item 2.Properties94Item 3.Legal Proceedings94Item 4.Mine Safety Disclosures95 PART II Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of EquitySecurities96Reserved99Management’s Discussion and Analysis of Financial Condition and Results of Operations99Quantitative and Qualitative Disclosures About Market Risk110Financial Statements and Supplementary Data110Changes in and Disagreements with Accountants on Accounting and Financial Disclosure110Controls and Procedures110Other Information113Disclosure Regarding Foreign Jurisdictions that Prevent Inspections113 Item 6.Item 7.Item 7A.Item 8.Item 9.Item 9A.Item 9B.Item 9C. PART III Directors, Executive Officers and Corporate Governance114Executive Compensation114Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters114Certain Relationships and Related Transactions, and Director Independence114Principal Accountant Fees and Serv