FORM 10-K (Mark One)☒ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended October 31, 2025OR□TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the transition period fromtoCommission File Number 0-19807 (Exact name of registrant as specified in its charter) 56-1546236(I.R.S. EmployerIdentification No.)94085(Zip Code) Delaware(State or other jurisdiction of (650) 584-5000(Registrant’s telephone number, including area code)Securities Registered Pursuant to Section 12(b) of the Act: 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 Section 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 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 requirementsfor 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’’ inRule 12b-2 of the Exchange Act. Accelerated FilerSmaller reporting companyEmerging growth company Large accelerated filerNon-accelerated filer 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 orrevised 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 internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared 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 included in the filingreflect 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 compensation received by Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes□No☒The aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold as of the last business day of the registrant’s most recently completed second fiscal quarter was approximately $59.3 billion. Aggregate market valueexcludes an aggregate of approximately 26.0 million shares of the registrant’s common stock, par value of $0.01 per share (Common Stock) held by theregistrant’s executive officers and directors and by each person known by the registrant to own 5% or more of the outstanding common stock on such date.Exclusion of shares held by any of these persons should not be construed to indicate that such person possesses the power, direct or indirect, to direct or causethe direction of the management or policies of the registrant, or that such person is controlled by or under common control with the registrant.On December 15, 2025, 191,318,206 shares of Common Stock were outstanding. DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s definitive Proxy Statement relating to the registrant’s 2026 Annual Meeting of Stockholders, scheduled to be held on April 16, 2026,are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. Except as expressly incorporated by reference, the registrant’sProxy Statement shall not be deemed to be part of this report. SYNOPSYS, INC.ANNUAL REPORT ON FORM 10-KFiscal year ended October 31, 2025TABLE OF CONTENTS Page No. PART I Item 1.Business3Item 1A.Risk Factors15Item 1B.Unresolved Staff Comments29Item 1C.Cybersecurity29Item 2.Properties30Item 3.Legal Proceedings31Item 4.Mine Safety Disclosures31 PART II Item 5.Market for Registrant’s Common Equity, Related Stockholder Matters andIssuer Purchases of Equity Securities32Item 6.[Reserved]33Item 7.Management’s Discussion and Analysis of Financial Conditio