X0609 4 2026-09-25 0 0002021728 Cerebras Systems Inc. CBRS 0002132472 Lie Sean false C/O CEREBRAS SYSTEMS INC. 1237 E. ARQUES AVEUNE SUNNYVALE CA 94085 0 1 0 0 Chief Technology Officer 1 Class A Common Stock 2026-09-25 4 C 0 120000 A 465569 D Class A Common Stock 2026-09-25 4 G 0 36000 0 D 429569 D Class A Common Stock 2026-09-25 4 S 0 500 212.14 D 429069 D Class A Common Stock 2026-09-25 4 S 0 9177 211.32 D 419892 D Class A Common Stock 2026-09-25 4 S 0 30565 210.45 D 389327 D Class A Common Stock 2026-09-25 4 S 0 29991 209.53 D 359336 D Class A Common Stock 2026-09-25 4 S 0 21022 208.41 D 338314 D Class A Common Stock 2026-09-25 4 S 0 6869 207.54 D 331445 D Class A Common Stock 2026-09-25 4 S 0 13776 206.63 D 317669 D Class A Common Stock 2026-09-25 4 S 0 5900 205.30 D 311769 D Class A Common Stock 2026-09-25 4 S 0 2200 204.50 D 309569 D Class B Common Stock Class A Common Stock 180600 180600 I By Spouse Stock Option 5.48 2026-09-25 4 M 0 116875 0 D 2034-02-06 Class B Common Stock 116875 172146 D Stock Option 5.02 2026-09-25 4 M 0 3125 0 D 2033-02-13 Class B Common Stock 3125 32420 D Class B Common Stock 2026-09-25 4 M 0 120000 0 A Class A Common Stock 120000 7702992 D Class B Common Stock 2026-09-25 4 C 0 120000 0 D Class A Common Stock 120000 7582992 D 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. The reporting person transferred 36,000 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. 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. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $211.97 to $212.31, 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. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $210.97 to $211.95, 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. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $209.97 to $210.96, 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. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $208.97 to $209.96, 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. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $207.97 to $208.95, 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. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $206.96 to $207.95, 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. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $205.96 to $206.95, 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. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $204.86 to $205.83, 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. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $203.86 to $204.83, 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. The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2024. The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2023. /s/ Robert Mills, Attorney-in-Fact 2026-09-28