Company: SNPS
Filing Date: 2025-03-03
Form Type: 424B5
Source: 0001140361-25-006661
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Company: SYNOPSYS INC
Filing Date: 2025-03-03
Form: 424B5
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#### TABLE OF CONTENTS
**The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.**

#### Filed pursuant to Rule 424(b)(5)

#### Registration No. 333-285378

#### Subject to Completion
<div align='center'>**Preliminary Prospectus Supplement dated March 3, 2025**</div>

### PROSPECTUS SUPPLEMENT
**(To Prospectus dated February 27, 2025)**

<div align='center'>**$**</div>

#### SYNOPSYS, INC.
<div align='center'>**$     % Senior Notes due 20

$     % Senior Notes due 20

$     % Senior Notes due 20

$     % Senior Notes due 20

$     % Senior Notes due 20

$     % Senior Notes due 20**</div>

We are offering $    aggregate principal amount of our senior notes due 20  (the “20  notes”), $    aggregate principal amount of our senior notes due 20  (the “20  notes”), $    aggregate principal amount of our senior notes due 20  (the “20  notes”), $     aggregate principal amount of our senior notes due 20  (the “20  notes”), $    aggregate principal amount of our senior notes due 20  (the “20  notes”) and $    aggregate principal amount of our senior notes due 20  (the “20  notes”). We refer to the 20  notes, the 20  notes, the 20  notes, the 20  notes, the 20  notes and the 20  notes as the “notes.”

The 20  notes will mature on   , 20 , the 20  notes will mature on   , 20