Steven Vassallo - 15 May 2026 Form 4 Insider Report for Cerebras Systems Inc. (CBRS)

Reporting relationship: Director
Issuer ticker: CBRS
Reported as of: 15 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 15 May 2026, 18:50:23 UTC
Prior SEC filing: 13 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Shirley Li, Attorney-in-Fact

Key filing fact

Steven Vassallo filed Form 4 for Cerebras Systems Inc. (CBRS) on 15 May 2026.

Key facts

This page summarizes Steven Vassallo's Form 4 filing for Cerebras Systems Inc. (CBRS).
6 reported transactions and 6 derivative rows are listed below.
Accepted by SEC: 15 May 2026, 18:50.

Change

Previous filing in this sequence was filed on 13 May 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001567929 Primary reporting owner

Vassallo Steven

Relationship: Director
Address: C/O CEREBRAS SYSTEMS INC., 1237 E. ARQUES AVENUE, SUNNYVALE
Signature: /s/ Shirley Li, Attorney-in-Fact
Signature date: 15 May 2026

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

CBRS transaction Derivative

Series A Preferred Stock

Conversion of derivative security

Transaction value
Shares: -12,588,235
Change %: -100%
Price
Shares after: 0
Date: 15 May 2026
Ownership: See footnotes:
Underlying class: Class B Common Stock
Underlying amount: 12,588,235
Exercise price
Footnotes: F1, F2, F3, F4

CBRS transaction Derivative

Series B Preferred Stock

Conversion of derivative security

Transaction value
Shares: -1,425,394
Change %: -100%
Price
Shares after: 0
Date: 15 May 2026
Ownership: See footnotes:
Underlying class: Class B Common Stock
Underlying amount: 1,425,394
Exercise price
Footnotes: F1, F2, F3, F4

CBRS transaction Derivative

Series C Preferred Stock

Conversion of derivative security

Transaction value
Shares: -111,765
Change %: -100%
Price
Shares after: 0
Date: 15 May 2026
Ownership: See footnotes:
Underlying class: Class B Common Stock
Underlying amount: 111,765
Exercise price
Footnotes: F1, F2, F3, F4

CBRS transaction Derivative

Series D Preferred Stock

Conversion of derivative security

Transaction value
Shares: -30,968
Change %: -100%
Price
Shares after: 0
Date: 15 May 2026
Ownership: See footnotes:
Underlying class: Class B Common Stock
Underlying amount: 30,968
Exercise price
Footnotes: F1, F2, F3, F4

CBRS transaction Derivative

Series E Preferred Stock

Conversion of derivative security

Transaction value
Shares: -1,145,981
Change %: -100%
Price
Shares after: 0
Date: 15 May 2026
Ownership: See footnotes
Underlying class: Class B Common Stock
Underlying amount: 1,145,981
Exercise price
Footnotes: F1, F2, F3, F4

CBRS transaction Derivative

Class B Common Stock

Conversion of derivative security

Transaction value
Shares: +15,302,343
Change %
Price
Shares after: 15,302,343
Date: 15 May 2026
Ownership: See footnotes:
Underlying class: Class A Common Stock
Underlying amount: 15,302,343
Exercise price
Footnotes: F1, F4, F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock.

Footnote F2

Consists of (i) 1,091,411 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital Leadership Fund II, L.P. ("Foundation Leadership Fund"); (ii) 265,414 shares of Class B common stock underlying Series A Preferred Stock, 30,053 shares of Class B common stock underlying Series B Preferred Stock, 2,356 shares of Class B common stock underlying Series C Preferred Stock, 653 shares of Class B common stock underlying Series D Preferred Stock, and 1,151 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital VIII Principals Fund, LLC ("Foundation Capital VIII Principals");...(continued in footnote 3)

Footnote F3

(continued from footnote 2)...and (iii) 12,322,821 shares of Class B common stock underlying Series A Preferred Stock, 1,395,341 shares of Class B common stock underlying Series B Preferred Stock, 109,409 shares of Class B common stock underlying Series C Preferred Stock, 30,315 shares of Class B common stock underlying Series D Preferred Stock, and 53,419 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital VIII, L.P. ("Foundation Capital VIII," and together with Foundation Leadership Fund and Foundation Capital VIII Principals, "Foundation Capital").

Footnote F4

Foundation Capital Management Co. VIII, L.L.C. is the General Partner of Foundation Capital VIII and the Manager of Foundation Capital VIII Principals and has sole voting and investment power with respect to the securities held by Foundation Capital VIII and Foundation Capital Principals. Steven P. Vassallo is a Manager of Foundation Capital Management Co. VIII, L.L.C. and may be deemed to beneficially own such shares. Foundation Capital Management Co. LF II, L.L.C. is the General Partner of Foundation Capital Leadership Fund and has sole voting and investment power with respect to the securities held by Foundation Capital Leadership Fund. Mr. Vassallo is a Manager of Foundation Capital Management Co. LF II, L.L.C. and may be deemed to beneficially own such shares. Mr. Vassallo disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein.

Footnote F5

Following the transactions reported herein, consists of (i) 1,091,411 shares of Class B common stock held by Foundation Leadership Fund, (ii) 299,627 shares of Class B common stock held by Foundation Capital VIII Principals, and (iii) 13,911,305 shares of Class B common stock held by Foundation Capital VIII.

We use cookies and similar technologies to provide certain features, enhance the user experience and, if you allow them, measure engagement and deliver advertising. Analytics and marketing storage stay off until you grant consent. By clicking on "Agree and continue", you declare your consent to the use of the selected optional cookies. to update or revoke optional consent for future visits. For more information, see our Privacy Policy .