X0609 4 2026-09-29 0 0002021728 Cerebras Systems Inc. CBRS 0001648800 Komin Robert Patrick Jr. false C/O CEREBRAS SYSTEMS INC. 1237 E. ARQUES AVENUE SUNNYVALE CA 94085 0 1 0 0 Chief Financial Officer 1 Class A Common Stock 2026-09-29 4 S 0 1830 211.79 D 30670 D Class A Common Stock 2026-09-29 4 S 0 2771 211.03 D 27899 D Class A Common Stock 2026-09-29 4 S 0 2802 210.02 D 25097 D Class A Common Stock 2026-09-29 4 S 0 2197 208.98 D 22900 D Class A Common Stock 2026-09-29 4 S 0 700 207.83 D 22200 D Class A Common Stock 2026-09-29 4 S 0 800 206.68 D 21400 D Class A Common Stock 2026-09-29 4 S 0 600 205.47 D 20800 D Class A Common Stock 2026-09-29 4 S 0 1600 204.26 D 19200 D Class A Common Stock 2026-09-29 4 S 0 800 203.48 D 18400 D Class A Common Stock 2026-09-29 4 S 0 400 201.96 D 18000 D Class A Common Stock 2026-09-29 4 S 0 11200 201.22 D 6800 D Class A Common Stock 2026-09-29 4 S 0 1130 199.80 D 5670 D Class A Common Stock 2026-09-29 4 S 0 870 198.70 D 4800 D Class A Common Stock 2026-09-29 4 S 0 685 197.48 D 4115 D Class A Common Stock 2026-09-29 4 S 0 1115 195.61 D 3000 D Class A Common Stock 2026-09-29 4 S 0 3000 194.92 D 0 D 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 June 30, 2026 The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $211.48 to $212.44, 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 $210.47 to $211.44, 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 $209.45 to $210.40, 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 $208.40 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 $207.33 to $208.23, 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 $205.02 to $205.79, 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 $203.93 to $204.86, 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 $202.85 to $203.78, 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 $201.60 to $202.39, 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 $200.30 to $201.28, 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 $199.28 to $200.25, 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 $198.28 to $199.22, 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 $197.15 to $198.13, 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 $195.45 to $195.89, 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 $194.45 to $195.21, 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. /s/ Robert Mills, Attorney-in-fact 2026-09-30