X0609 4 2026-09-04 0 0002021728 Cerebras Systems Inc. CBRS 0002039573 Feldman Andrew D. false C/O CEREBRAS SYSTEMS INC. 1237 E. ARQUES AVENUE SUNNYVALE CA 94085 1 1 0 0 CEO, President 0 Class A Common Stock 2026-09-04 4 C 0 37441 0 A 54294 D Class A Common Stock 2026-09-04 4 S 0 1100 199.18 D 53194 D Class A Common Stock 2026-09-04 4 S 0 300 200.79 D 52894 D Class A Common Stock 2026-09-04 4 S 0 300 201.75 D 52594 D Class A Common Stock 2026-09-04 4 S 0 900 202.97 D 51694 D Class A Common Stock 2026-09-04 4 S 0 1200 204.06 D 50494 D Class A Common Stock 2026-09-04 4 S 0 800 206.30 D 49694 D Class A Common Stock 2026-09-04 4 S 0 1500 207.80 D 48194 D Class A Common Stock 2026-09-04 4 S 0 1707 208.84 D 46487 D Class A Common Stock 2026-09-04 4 S 0 6721 209.99 D 39766 D Class A Common Stock 2026-09-04 4 S 0 6153 210.91 D 33613 D Class A Common Stock 2026-09-04 4 S 0 7439 211.85 D 26174 D Class A Common Stock 2026-09-04 4 S 0 3324 213.04 D 22850 D Class A Common Stock 2026-09-04 4 S 0 3897 213.95 D 18953 D Class A Common Stock 2026-09-04 4 S 0 1400 214.98 D 17553 D Class A Common Stock 2026-09-04 4 S 0 600 215.81 D 16953 D Class A Common Stock 2026-09-04 4 S 0 100 216.62 D 16853 D Class A Common Stock 2026-09-08 4 J 0 120 0 A 806 I By Feldman Bravo Family Trust Stock Option 2.72 2026-09-04 4 M 0 37441 0 D 2030-12-07 Class B Common Stock 37441 525000 D Class B Common Stock 2026-09-04 4 M 0 37441 0 A Class A Common Stock 37441 13982575 D Class B Common Stock 2026-09-04 4 C 0 37441 0 D Class A Common Stock 37441 13945134 D Class B Common Stock Class A Common Stock 50000 50000 I By GRAT 1 Class B Common Stock Class A Common Stock 50000 50000 I By GRAT 2 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 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 $199.00 to $199.87, 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 $200.16 to $201.12, 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 $201.45 to $202.11, 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 $202.59 to $203.43, 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 $203.65 to $204.62, 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 $206.02 to $206.53, 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 $207.21 to $208.19, 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 $208.39 to $209.38, 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 $209.41 to $210.34, 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 $210.42 to $211.42, 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 $211.42 to $212.39, 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 $212.50 to $213.49, 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 $213.50 to $214.48, 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 $214.52 to $215.33, 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 $215.53 to $216.06, 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. Represents a pro-rata, in-kind distribution not for additional consideration. The stock option is fully vested and exercisable. /s/ Robert Mills, Attorney-in-fact 2026-09-08