X0609 4 2026-08-21 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 2026-08-21 4 G 0 50000 D 16853 D Class A Common Stock 2026-08-21 4 C 0 237559 0 A 254412 D Class A Common Stock 2026-08-21 4 S 0 43553 196.20 D 210859 D Class A Common Stock 2026-08-21 4 S 0 21307 197.45 D 189552 D Class A Common Stock 2026-08-21 4 S 0 32864 198.18 D 156688 D Class A Common Stock 2026-08-21 4 S 0 66237 199.33 D 90451 D Class A Common Stock 2026-08-21 4 S 0 33575 200.13 D 56876 D Class A Common Stock 2026-08-21 4 S 0 8832 201.12 D 48044 D Class A Common Stock 2026-08-21 4 S 0 6699 202.28 D 41345 D Class A Common Stock 2026-08-21 4 S 0 12092 203.37 D 29253 D Class A Common Stock 2026-08-21 4 S 0 4800 204.44 D 24453 D Class A Common Stock 2026-08-21 4 S 0 1600 205.32 D 22853 D Class A Common Stock 2026-08-21 4 S 0 1400 207.28 D 21453 D Class A Common Stock 2026-08-21 4 S 0 4594 208.86 D 16859 D Class A Common Stock 2026-08-21 4 S 0 6 210.21 D 16853 D Class A Common Stock 2026-08-24 4 J 0 120 0 A 686 I By Feldman Bravo Family Trust Stock Option 5.02 2026-08-21 4 M 0 62674 0 D 2033-02-13 Class B Common Stock 62674 87326 D Stock Option 7.89 2026-08-21 4 M 0 137326 0 D 2032-01-11 Class B Common Stock 137326 12674 D Stock Option 2.72 2026-08-21 4 M 0 37559 0 D 2030-12-07 Class B Common Stock 37559 562441 D Class B Common Stock 2026-08-21 4 M 0 237559 0 A Class A Common Stock 237559 14182693 D Class B Common Stock 2026-08-21 4 C 0 237559 0 D Class A Common Stock 237559 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 reporting person transferred 50,000 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 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 $195.75 to $196.74, 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 $196.75 to $197.74, 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 $197.75 to $198.74, 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 $198.75 to $199.74, 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 $199.75 to $200.74, 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 $200.75 to $201.72, 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 $201.86 to $202.83, 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 $202.90 to $203.87, 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 $203.92 to $204.87, 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 $204.96 to $205.67, 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 $206.81to $207.59, 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 $208.42 to $209.00, 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 vests in 48 substantially equal monthly installments beginning on February 1, 2023. The stock option is fully vested and exercisable. /s/ Robert Mills, Attorney-in-fact 2026-08-25