X0609 4 2026-08-24 1 0002021728 Cerebras Systems Inc. CBRS 0001593049 Benchmark Capital Management Co. VIII, L.L.C. false 2965 WOODSIDE ROAD WOODSIDE CA 94062 0 0 1 0 0001593052 Benchmark Capital Partners VIII, L.P. false 2965 WOODSIDE ROAD WOODSIDE CA 94062 0 0 1 0 0001597415 Benchmark Founders' Fund VIII, L.P. false 2965 WOODSIDE ROAD WOODSIDE CA 94062 0 0 1 0 0001597399 Benchmark Founders' Fund VIII-B, L.P. false 2965 WOODSIDE ROAD WOODSIDE CA 94062 0 0 1 0 0001754445 Benchmark Capital Management Co. IX, L.L.C. false 2965 WOODSIDE ROAD WOODSIDE CA 94062 0 0 1 0 0001754447 Benchmark Capital Partners IX, L.P. false 2965 WOODSIDE ROAD WOODSIDE CA 94062 0 0 1 0 0001754444 Benchmark Founders' Fund IX, L.P. false 2965 WOODSIDE ROAD WOODSIDE CA 94062 0 0 1 0 0001756980 Benchmark Founders' Fund IX-A, L.P. false 2965 WOODSIDE ROAD WOODSIDE CA 94062 0 0 1 0 0001754351 Benchmark Founders' Fund IX-B, L.P. false 2965 WOODSIDE ROAD WOODSIDE CA 94062 0 0 1 0 1 Class A Common Stock 2026-08-24 4 C 0 963818 0.00 A 963818 I See Footnote Class A Common Stock 2026-08-24 4 J 0 963818 0.00 D 0 I See Footnote Class B Common Stock 2026-08-24 4 C 0 963818 0.00 D Class A Common Stock 963818 8861375 I See Footnote Class B Common Stock Class A Common Stock 689990 689990 I See Footnote Conversion of a derivative security in accordance with its terms. The shares are held by Benchmark Capital Partners VIII, L.P. ("BCP VIII"), as nominee for itself, Benchmark Founders' Fund VIII, L.P. ("BFF VIII") and Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of each of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over such shares. Each entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such entity's pecuniary interest in such securities. Represents a pro-rata, in-kind distribution by BCP VIII and its affiliated funds, not for additional consideration, to its partners, including BCMC VIII and its respective members and assignees, in accordance with a Rule 10b5-1 trading plan adopted by the reporting person on May 14, 2026. Each share of Class B Common Stock held by the Reporting Person will automatically convert into one share of Class A Common Stock upon the sale or transfer of such share of Class B Common Stock, subject to certain exceptions, and in certain other circumstances described in the Issuer's amended and restated certificate of incorporation. Each share of Class B Common Stock will also be convertible at any time at the option of the Reporting Person into one share of Class A Common Stock. The shares are held by Benchmark Capital Partners IX, L.P. ("BCP IX"), as nominee for itself, Benchmark Founders' Fund IX, L.P. ("BFF IX"), Benchmark Founders' Fund IX-A, L.P. ("BFF IX-A"), and Benchmark Founders' Fund IX-B, L.P. ("BFF IX-B"). Benchmark Capital Management Co. IX, L.L.C. ("BCMC IX"), the general partner of each of BCP IX, BFF IX, BFF IX-A and BFF IX-B, may be deemed to have sole voting and dispositive power over such shares. Each such entity disclaims the existence of a "group" and disclaims beneficial ownership of any securities, except to the extent of such entity's pecuniary interest in such securities. This report is one of two reports, each on a separate Form 4, but relating to the same holdings being filed by entities affiliated with Benchmark. /s/ An-Yen Hu by power of attorney for Benchmark Capital Management Co. VIII, L.L.C. 2026-08-26 /s/ An-Yen Hu by power of attorney for Benchmark Capital Management Co. VIII, L.L.C., the General Partner of Benchmark Capital Partners VIII, L.P. 2026-08-26 /s/ An-Yen Hu by power of attorney for Benchmark Capital Management Co. VIII, L.L.C., the General Partner of Benchmark Founders' Fund VIII, L.P. 2026-08-26 /s/ An-Yen Hu by power of attorney for Benchmark Capital Management Co. VIII, L.L.C., the General Partner of Benchmark Founders' Fund VIII-B, L.P. 2026-08-26 /s/ An-Yen Hu, Managing Member of Benchmark Capital Management Co. IX, L.L.C. 2026-08-26 /s/ An-Yen Hu, Managing Member of Benchmark Capital Management Co. IX, L.L.C., the General Partner of Benchmark Capital Partners IX, L.P. 2026-08-26 /s/ An-Yen Hu, Managing Member of Benchmark Capital Management Co. IX, L.L.C., the General Partner of Benchmark Founders' Fund IX, L.P. 2026-08-26 /s/ An-Yen Hu, Managing Member of Benchmark Capital Management Co. IX, L.L.C., the General Partner of Benchmark Founders' Fund IX-A, L.P. 2026-08-26 /s/ An-Yen Hu, Managing Member of Benchmark Capital Management Co. IX, L.L.C., the General Partner of Benchmark Founders' Fund IX-B, L.P. 2026-08-26