Company: SNPS
Filing Date: 2025-07-14
Form Type: 425
Source: 0001193125-25-158491
Chunk: 0

Company: SYNOPSYS INC
Filing Date: 2025-07-14
Form: 425
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 14, 2025 SYNOPSYS, INC. (Exact Name of Registrant as Specified in its Charter)

| Delaware                     |     | 000-19807   |     | 56-1546236            |
| (State or Other Jurisdiction 
 of Incorporation)            |     | -Commission 
 File Number |     | -I.R.S. Employer      
 Identification Number |

| 675 Almanor Ave.                                    |
| Sunnyvale, California 94085                         |
| (Address of Principal Executive Offices) (Zip Code) |

(650) 584-5000 (Registrant’s telephone number, including area code) N/A (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-Kfiling is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

| ☒ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |

| ☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 
 CFR 240-14a-12)                                                        |

| ☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |

| ☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |

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

| Title of Class                              |     | Trading   
 Symbol(s) |     | Name of each exchange       
 on which registered         |
| Common Stock (par value of $0.01 per share) |     | SNPS      |     | Nasdaq Global Select Market |

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2of the Securities Exchange Act of 1934 (§240.12b-2of this chapter). Emerging Growth Company