Company: SNPS
Filing Date: 2025-07-14
Form Type: 425
Source: 0001193125-25-158491
Chunk: 3

Company: SYNOPSYS INC
Filing Date: 2025-07-14
Form: 425
Chunk 3
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us. Each party has filed or may file other documents regarding the proposed transaction with the SEC. This document is not a substitute for the proxy statement/prospectus or
registration statement or any other document that Synopsys or Ansys may file with the SEC. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT, PROXY STATEMENT/PROSPECTUS AND ALL OTHER RELEVANT DOCUMENTS FILED OR THAT MAY BE
FILED WITH THE SEC IN CONNECTION WITH THE PROPOSED TRANSACTION, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THESE DOCUMENTS, CAREFULLY AND IN THEIR ENTIRETY IF AND WHEN THEY BECOME AVAILABLE BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION
ABOUT THE PROPOSED TRANSACTION.

Investors and security holders may obtain free copies of the registration statement, proxy statement/prospectus and all
other relevant documents filed or that will be filed with the SEC by Synopsys or Ansys through the website maintained by the SEC at .

The documents filed by Synopsys with the SEC also may be obtained free of charge at Synopsys’ website at
or upon written request to Synopsys at Synopsys, Inc., 675 Almanor Avenue, Sunnyvale, California 94085, Attention: Investor Relations. The documents filed by Ansys with the SEC also may be
obtained free of charge at Ansys’ website at or upon written request to kelsey.debriyn@ansys.com.

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.

| Dated: July 14, 2025 |     | SYNOPSYS, INC. 
 By:            |     | /s/ John F. Runkel, Jr.                 |
|:---------------------|:----|:---------------|:----|:----------------------------------------|
|                      |     | Name:          |     | John F. Runkel, Jr.                     |
|                      |     | Title:         |     | General Counsel and Corporate Secretary |

Exhibit 99.1

NEWS RELEASE

Synopsys Receives All Necessary Approvals for Proposed Acquisition of Ansys

SUNNYVALE, Calif., July14, 2025 – (Nasdaq: ) today announced that it has received approval
from all necessary authorities to proceed with