X0609 4 2026-08-20 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 0 Class A Common Stock 2026-08-20 4 C 0 696798 A 1292247 D Class A Common Stock 2026-08-20 4 G 0 213074 0 D 1079173 D Class A Common Stock 2026-08-20 4 S 0 11706 203.78 D 1067467 D Class A Common Stock 2026-08-20 4 S 0 47766 204.87 D 1019701 D Class A Common Stock 2026-08-20 4 S 0 133383 205.67 D 886318 D Class A Common Stock 2026-08-20 4 S 0 93017 206.67 D 793301 D Class A Common Stock 2026-08-20 4 S 0 108507 207.68 D 684794 D Class A Common Stock 2026-08-20 4 S 0 119311 208.69 D 565483 D Class A Common Stock 2026-08-20 4 S 0 114976 209.86 D 450507 D Class A Common Stock 2026-08-20 4 S 0 46214 210.56 D 404293 D Class A Common Stock 2026-08-20 4 S 0 10715 211.42 D 393578 D Class A Common Stock 2026-08-20 4 S 0 24652 212.64 D 368926 D Class A Common Stock 2026-08-21 4 C 0 16293 0 A 385219 D Class A Common Stock 2026-08-21 4 S 0 16293 210.01 D 368926 D Class B Common Stock Class A Common Stock 180600 180600 I By Spouse Stock Option 2.40 2026-08-20 4 M 0 308236 0 D 2029-05-13 Class B Common Stock 308236 41764 D Stock Option 2.72 2026-08-20 4 M 0 138236 0 D 2030-12-07 Class B Common Stock 138236 36764 D Stock Option 7.89 2026-08-20 4 M 0 87326 0 D 2032-01-11 Class B Common Stock 87326 12674 D Stock Option 5.02 2026-08-20 4 M 0 114455 0 D 2033-02-13 Class B Common Stock 114455 35545 D Stock Option 5.48 2026-08-20 4 M 0 48545 0 D 2034-02-06 Class B Common Stock 48545 351455 D Class B Common Stock 2026-08-20 4 M 0 696798 0 A Class A Common Stock 696798 8279790 D Class B Common Stock 2026-08-20 4 C 0 696798 0 D Class A Common Stock 696798 7582992 D Stock Option 5.48 2026-08-21 4 M 0 16293 0 D 2034-02-06 Class B Common Stock 16293 335162 D Class B Common Stock 2026-08-21 4 M 0 16293 0 A Class A Common Stock 16293 7599285 D Class B Common Stock 2026-08-21 4 C 0 16293 0 D Class A Common Stock 16293 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 213,074 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 $203.18 to $204.17, 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 $204.18 to $205.17, 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 $205.18 to $206.17, 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 $206.18 to $207.17, 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 $207.18 to $208.17, 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 $208.18 to $209.17, 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 $209.18 to $210.17, 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 $210.18 to $211.17, 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 $211.21 to $212.12, 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 $212.22 to $213.16, 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 $210.00 to $210.16, 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 is fully vested and exercisable. The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2023. The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2024. /s/ Robert Mills, Attorney-in-Fact 2026-08-21