X0202 SCHEDULE 13G 0000315066 XXXXXXXX LIVE Class A Common Stock 05/29/2026 0002021728 Cerebras Systems Inc. 15675D103 1237 E. ARQUES AVE. SUNNYVALE CA 94085 Rule 13d-1(b) FMR LLC DE 25575072.00 0.00 25618272.00 0.00 25618272.00 46.6 HC Abigail P. Johnson X1 0.00 0.00 25618272.00 0.00 25618272.00 46.6 IN Cerebras Systems Inc. 1237 E. ARQUES AVE., SUNNYVALE, CALIFORNIA, 94085. FMR LLC 245 Summer Street, Boston, Massachusetts 02210 Not applicable N HC 25,618,272* *20,443,122 of the shares of Class A Common Stock of CEREBRAS SYSTEMS INC reported as being beneficially owned by the reporting persons at May 29, 2026, are included in this Schedule 13G because the Reporting persons are deemed to beneficially own such shares as a result of the direct ownership of 20,443,122 shares of Class B Common Stock of CEREBRAS SYSTEMS INC by investment companies advised by Fidelity Management & Research Company LLC, Fidelity Institutional Asset Management Trust Company, Fidelity Management Trust Company, and Fidelity Diversifying Solutions LLC an indirect wholly-owned subsidiary of FMR LLC as of such date, which shares of Class B Common Stock are convertible into shares of Class A Common Stock at the election of the holder at an exchange rate of 1:1. Such shares of Class B Common Stock represent 11.0360% of the outstanding Class B Common Stock. Assuming the conversion of all outstanding shares of Class B Common Stock into Class A Common Stock, the 25,618,272 shares of Class A Common Stock reported as being beneficially owned by the reporting persons in this Schedule 13G would represent 46.6269% of the outstanding Class A Common Stock. 46.6 Please see the responses to Items 5 and 6 on the cover page 0.00 25,618,272* *20,443,122 of the shares of Class A Common Stock of CEREBRAS SYSTEMS INC reported as being beneficially owned by the reporting persons at May 29, 2026, are included in this Schedule 13G because the Reporting persons are deemed to beneficially own such shares as a result of the direct ownership of 20,443,122 shares of Class B Common Stock of CEREBRAS SYSTEMS INC by investment companies advised by Fidelity Management & Research Company LLC, Fidelity Institutional Asset Management Trust Company, Fidelity Management Trust Company, and Fidelity Diversifying Solutions LLC an indirect wholly-owned subsidiary of FMR LLC as of such date, which shares of Class B Common Stock are convertible into shares of Class A Common Stock at the election of the holder at an exchange rate of 1:1. Such shares of Class B Common Stock represent 11.0360% of the outstanding Class B Common Stock. Assuming the conversion of all outstanding shares of Class B Common Stock into Class A Common Stock, the 25,618,272 shares of Class A Common Stock reported as being beneficially owned by the reporting persons in this Schedule 13G would represent 46.6269% of the outstanding Class A Common Stock. 0.00 Y N N One or more other persons are known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from CLASS A COMMON STOCK of CEREBRAS SYSTEMS INC. The interest of Fidelity Contrafund, in the CLASS A COMMON STOCK of CEREBRAS SYSTEMS INC, amounted to 3,630,500.00 shares or 6.6% of the total outstanding CLASS A COMMON STOCK at May 29, 2026. The interest of Fidelity Growth Company Commingled Pool, in the CLASS A COMMON STOCK of CEREBRAS SYSTEMS INC, amounted to 3,621,731.00 shares or 6.6% of the total outstanding CLASS A COMMON STOCK at May 29, 2026. N See attached Exhibit 99. N Not applicable. N Not applicable. N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. Please see Exhibit 99 for 13d-1(k) (1) agreement. FMR LLC Stephanie J. Brown 06/04/2026 Abigail P. Johnson Stephanie J. Brown 06/04/2026 * This power of attorney is incorporated herein by reference to Exhibit 24 to the Schedule 13G filed by FMR LLC on January 10, 2023, accession number: 0000315066-23-000003. ** This power of attorney is incorporated herein by reference to Exhibit 24 to the Schedule 13G filed by FMR LLC on January 31, 2023, accession number: 0000315066-23-000038.