=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-09-04
10b5-1 Pre-arranged Plan: No
--- Issuer ---
Name: Cerebras Systems Inc. (CBRS)
CIK: 0002021728
--- Reporting Owner ---
Name: Vassallo Steven
CIK: 0001567929
Role: Director
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Class A Common Stock
Date: 2026-09-04 | Code: S (Open market sale)
Shares: -21,117 | Price: $209.81
Total Value: $4,430,557.77
Shares Owned After: 200,860 | Ownership: I (Indirect) | Nature: By Revocable Trust
Footnotes:
[F1] The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $209.00 to $209.99, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
[F2] The securities are held by a revocable family trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his proportionate pecuniary interest therein.
[Transaction #2]
Security: Class A Common Stock
Date: 2026-09-04 | Code: S (Open market sale)
Shares: -21,773 | Price: $210.37
Total Value: $4,580,386.01
Shares Owned After: 179,087 | Ownership: I (Indirect) | Nature: By Revocable Trust
Footnotes:
[F3] The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $210.00 to $210.99, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
[F2] The securities are held by a revocable family trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his proportionate pecuniary interest therein.
[Transaction #3]
Security: Class A Common Stock
Date: 2026-09-04 | Code: S (Open market sale)
Shares: -7,110 | Price: $211.56
Total Value: $1,504,191.60
Shares Owned After: 171,977 | Ownership: I (Indirect) | Nature: By Revocable Trust
Footnotes:
[F4] The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $211.00 to $211.99, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
[F2] The securities are held by a revocable family trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his proportionate pecuniary interest therein.
--- Holdings ---
[Holding #1]
Security: Class A Common Stock
Ownership: I (Indirect)
Footnotes:
[F5] The securities are held by an irrevocable GST trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.
--- Footnotes (Complete Index) ---
F1: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $209.00 to $209.99, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
F2: The securities are held by a revocable family trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his proportionate pecuniary interest therein.
F3: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $210.00 to $210.99, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
F4: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $211.00 to $211.99, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
F5: The securities are held by an irrevocable GST trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.
--- Signature ---
/s/ /s/ Robert Mills, Attorney-in-fact (2026-09-08)
