X0202 SCHEDULE 13G 0001645076 XXXXXXXX LIVE Class A Common Stock, $0.00001 par value per share 06/30/2026 0002021728 Cerebras Systems Inc. 15675D103 1237 E. Arques Avenue Sunnyvale CA 94085 Rule 13d-1(d) Foundation Capital Management Co. VIII, L.L.C. b DE 0.00 14210932.00 0.00 14210932.00 14210932.00 12.2 OO Foundation Capital VIII, L.P. b DE 0.00 13911305.00 0.00 13911305.00 13911305.00 12.0 PN Foundation Capital VIII Principals Fund, L.L.C. b DE 0.00 299627.00 0.00 299627.00 299627.00 0.3 OO Foundation Capital Management Co. LF II, L.L.C. b DE 0.00 1091411.00 0.00 1091411.00 1091411.00 1.0 OO Foundation Capital Leadership Fund II, L.P. b DE 0.00 1091411.00 0.00 1091411.00 1091411.00 1.0 PN Cerebras Systems Inc. 1237 E. Arques Avenue, Sunnyvale, CA, 94085. The names of the persons filing this report (collectively, the "Reporting Persons") are: Foundation Capital Management Co. VIII, L.L.C. ("FCM8") Foundation Capital VIII, L.P. ("FC8") Foundation Capital VIII Principals Fund, L.L.C. ("FCP8") Foundation Capital Management Co. LF II, L.L.C. ("FCMLF2") Foundation Capital Leadership Fund II, L.P. ("FCLF2") The Reporting Persons expressly disclaim status as a "group" for purposes of this Schedule 13G. c/o Foundation Capital 550 High Street, 3rd Floor Palo Alto, CA 94301 FCM8 Delaware FC8 Delaware FCP8 Delaware FCMLF2 Delaware FCLF2 Delaware Y Row 9 of each Reporting Person's cover page to this Schedule 13G sets forth the aggregate number of securities of the Issuer beneficially owned by such Reporting Person as of June 30, 2026 and is incorporated by reference. The Reporting Persons' beneficial ownership of the Issuer's securities includes (i) 1,391,131 shares of Class A common stock and 12,520,174 shares of Class B common stock directly held by FC8; (ii) 29,963 shares of Class A common stock and 269,664 shares of Class B common stock directly held by FCP8; and (iii) 109,141 shares of Class A common stock and 982,270 shares of Class B common stock directly held by FCLF2. Each share of Class B common stock is convertible into one share of Class A common stock. FCM8 is the general partner of FC8 and the manager of FCP8 and may be deemed to beneficially own the shares held by each of FC8 and FCP8. FCMLF2 is the general partner of FCLF2 and may be deemed to beneficially own the shares held by each of FCLF2. Collectively, the Reporting Persons beneficially own an aggregate of 15,302,343 shares of Class A common stock. Row 11 of each Reporting Person's cover page to this Schedule 13G sets forth the percentage of the Issuer's Class A common stock beneficially owned by such Reporting Person as of June 30, 2026 and is incorporated by reference. The percentage set forth in each row 11 is based upon 103,220,568 shares of Class A common stock outstanding as of June 30, 2026, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission (the "SEC") on August 12, 2026 and (ii) the shares of Class A common stock issuable upon conversion of Class B common stock held by the Reporting Persons. Collectively, the Reporting Persons beneficially own 13.1% of the Issuer's Class A common stock. Row 5 of each Reporting Person's cover page to this Schedule 13G sets forth the sole power to vote or to direct the vote of securities of the Issuer beneficially owned by such Reporting Person as of June 30, 2026 and is incorporated by reference. Row 6 of each Reporting Person's cover page to this Schedule 13G sets forth the shared power to vote or to direct the vote of securities of the Issuer beneficially owned by such Reporting Person as of June 30, 2026 and is incorporated by reference. Row 7 of each Reporting Person's cover page to this Schedule 13G sets forth the sole power to dispose or to direct the disposition of securities of the Issuer beneficially owned by such Reporting Person as of June 30, 2026 and is incorporated by reference. Row 8 of each Reporting Person's cover page to this Schedule 13G sets forth the shared power to dispose or to direct the disposition of securities of the Issuer beneficially owned by such Reporting Person as of June 30, 2026 and is incorporated by reference. Y Y Y Y Y Y Exhibit 99.1 Joint Filing Agreement Foundation Capital Management Co. VIII, L.L.C. /s/ Ashu Garg 08/14/2026 Foundation Capital VIII, L.P. /s/ Ashu Garg 08/14/2026 Foundation Capital VIII Principals Fund, L.L.C. /s/ Ashu Garg 08/14/2026 Foundation Capital Management Co. LF II, L.L.C. /s/ Ashu Garg 08/14/2026 Foundation Capital Leadership Fund II, L.P. /s/ Ashu Garg 08/14/2026