Item 2.05 Costs Associated with Exit or Disposal Activities. On August 21, 2026, the Board approved updated estimates related to the Restructuring Plan that were previously disclosed in the Original8-Kto reflect additional restructuring costs. Synopsys now estimates that it will recognize pre-taxcharges to its GAAP financial results ranging from $425 million to $500 million, consisting primarily of severance and other one-timetermination benefits, and other costs such as certain site closures as part of its global site strategy. This Item 2.05 includes certain forward-looking statements with respect to the size and scope of the restructuring, and the approximate amount and expected timing of the related charges. These statements involve risks, uncertainties and other factors that could cause Synopsys’ actual results, time frames or achievements to differ materially from those expressed or implied in such forward-looking statements. Such risks, uncertainties and factors include but are not limited to, Synopsys’ ability to implement the restructuring in various jurisdictions, possible changes in the size, components and timing of the expected costs and charges, Synopsys’ ability to achieve the benefits of the announced restructuring, and the risks more fully described in filings Synopsys makes with the SEC from time to time, including in the sections entitled “ Risk Factors” in Synopsys’ latest Annual Report on Form 10-Kand in Synopsys’ latest Quarterly Report on Form10-Q. The information provided herein is as of August 26, 2026. Synopsys undertakes no duty to, and does not intend to, update any forward-looking statement, whether as a result of new information, future events or otherwise, unless required by law. 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, hereunto duly authorized. SYNOPSYS, INC. Dated: August 26, 2026 By: /s/ JANET LEE Janet Lee General Counsel and Corporate Secretary