Cerebras Systems Inc. (CBRS)

=== 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: Lie Sean CIK: 0002132472 Role: Officer (Chief Technology Officer) --- Non-Derivative Transactions --- [Transaction #1] Security: Class A Common Stock Date: 2026-09-04 | Code: C (Conversion of derivative) Shares: +46,141 Shares Owned After: 415,067 | Ownership: D (Direct) Footnotes: [F1] The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. [F1] The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. [Transaction #2] Security: Class A Common Stock Date: 2026-09-04 | Code: G (Gift) Shares: -16,038 | Price: $0.00 Shares Owned After: 399,029 | Ownership: D (Direct) Footnotes: [F2] The reporting person transferred 16,038 shares of the Issuer's common stock to a donor-advised fund sponsored by a charitable organization under Section 501(c)(3) of the Internal Revenue Code. [Transaction #3] Security: Class A Common Stock Date: 2026-09-04 | Code: S (Open market sale) Shares: -53,460 | Price: $210.16 Total Value: $11,235,153.60 Shares Owned After: 345,569 | Ownership: D (Direct) Footnotes: [F3] The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026. [F4] 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 $210.45, 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. --- Derivative Transactions --- [Transaction #1] Security: Stock Option Date: 2026-09-04 | Code: M (Exercise of derivative) Shares: -46,141 | Price: $0.00 Exercise Price: $5.48 Exercisable: N/A | Expires: 2034-02-06 Shares Owned After: 289,021 | Ownership: D (Direct) Footnotes: [F5] The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2024. [Transaction #2] Security: Class B Common Stock Date: 2026-09-04 | Code: M (Exercise of derivative) Shares: +46,141 | Price: $0.00 Shares Owned After: 7,629,133 | Ownership: D (Direct) Footnotes: [F1] The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. [F1] The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. [F1] The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. [F1] The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. [Transaction #3] Security: Class B Common Stock Date: 2026-09-04 | Code: C (Conversion of derivative) Shares: -46,141 | Price: $0.00 Shares Owned After: 7,582,992 | Ownership: D (Direct) Footnotes: [F1] The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. [F1] The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. [F1] The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. --- Holdings --- [Holding #1] Security: Class B Common Stock Ownership: I (Indirect) Footnotes: [F1] The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. [F1] The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. [F1] The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. --- Footnotes (Complete Index) --- F1: The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date. F2: The reporting person transferred 16,038 shares of the Issuer's common stock to a donor-advised fund sponsored by a charitable organization under Section 501(c)(3) of the Internal Revenue Code. F3: The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026. F4: 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 $210.45, 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 stock option vests in 48 substantially equal monthly installments beginning on February 1, 2024. --- Signature --- /s/ /s/ Robert Mills, Attorney-in-Fact (2026-09-08)