X0609 4 2026-09-29 0 0002021728 Cerebras Systems Inc. CBRS 0002039572 Mallick Dhiraj false C/O CEREBRAS SYSTEMS INC. 1237 E. ARQUES AVENUE SUNNYVALE CA 94085 0 1 0 0 Chief Operating Officer 1 Class A Common Stock 2026-09-29 4 C 0 276000 0 A 396000 D Class A Common Stock 2026-09-29 4 S 0 598 212.93 D 395402 D Class A Common Stock 2026-09-29 4 S 0 18274 212.20 D 377128 D Class A Common Stock 2026-09-29 4 S 0 41391 211.29 D 335737 D Class A Common Stock 2026-09-29 4 S 0 46427 210.27 D 289310 D Class A Common Stock 2026-09-29 4 S 0 41278 209.33 D 248032 D Class A Common Stock 2026-09-29 4 S 0 20714 208.38 D 227318 D Class A Common Stock 2026-09-29 4 S 0 9652 207.06 D 217666 D Class A Common Stock 2026-09-29 4 S 0 9047 206.13 D 208619 D Class A Common Stock 2026-09-29 4 S 0 8729 205.17 D 199890 D Class A Common Stock 2026-09-29 4 S 0 27492 204.17 D 172398 D Class A Common Stock 2026-09-29 4 S 0 9682 203.37 D 162716 D Class A Common Stock 2026-09-29 4 S 0 5637 201.91 D 157079 D Class A Common Stock 2026-09-29 4 S 0 22915 200.96 D 134164 D Class A Common Stock 2026-09-29 4 S 0 17848 199.89 D 116316 D Class A Common Stock 2026-09-29 4 S 0 17000 198.96 D 99316 D Class A Common Stock 2026-09-29 4 S 0 5170 197.85 D 94146 D Class A Common Stock 2026-09-29 4 S 0 6613 197.05 D 87533 D Class A Common Stock 2026-09-29 4 S 0 18703 195.56 D 68830 D Class A Common Stock 2026-09-29 4 S 0 68830 194.91 D 0 D Stock Option 0.98 2026-09-29 4 M 0 276000 0 D 2028-07-16 Class B Common Stock 276000 91370 D Class B Common Stock 2026-09-29 4 M 0 276000 0 A Class A Common Stock 276000 796807 D Class B Common Stock 2026-09-29 4 C 0 276000 0 D Class A Common Stock 276000 520807 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 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 $212.92 to $212.94, 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 $211.81 to $212.80, 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 $210.81 to $211.81, 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 $209.81 to $210.80, 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 $208.81 to $209.80, 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 $207.81 to $208.80, 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 $206.68 to $207.67, 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 $205.67 to $206.66, 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 $204.65 to $205.64, 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 $204.65, 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 $202.63 to $203.61, 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 $201.44 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 $200.42 to $201.41, 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 $199.42 to $200.37, 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 $198.42 to $199.41, 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 $197.41 to $198.40, 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 $196.41 to $197.40, 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 $195.27 to $195.96, 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 $194.27 to $195.26, 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. /s/ Robert Mills, Attorney-in-fact 2026-09-30