X0202 SCHEDULE 13D/A 0001675124 XXXXXXXX LIVE 2 Class A common stock, $0.00001 par value per share 08/14/2026 false 0002021728 US15675D1037 Cerebras Systems, Inc.

1237 E. Arques Avenue Sunnyvale CA 94085

Lior Susan, Managing Member (650) 720-4667 Eclipse Ventures 541 High Street, Suite 4 Palo Alto CA 94301 0001675124 N Eclipse Continuity GP I, LLC b AF N DE 0 546645 0 546645 546645 N 0.2 OO Represents 546,645 shares of Class A common stock (as defined in Item 1(a)). All shares are held by Eclipse Continuity I (as defined in Item 2(a)). Eclipse Continuity GP (as defined in Item 2(a)) is the general partner of Eclipse Continuity I and may be deemed to have voting and dispositive power over the shares held by Eclipse Continuity I. Mr. Susan (as defined in Item 2(a)), a member of the Issuer's Board (as defined in Item 2(a)), is the sole managing member of Eclipse Continuity GP and may be deemed to have voting and dispositive power with respect to these securities. Based on 223,848,533 shares of common stock outstanding, consisting of (i) 112,247,109 shares of Class A common stock outstanding as of August 5, 2026, as reported by the Issuer (as defined in Item 1(a) below) in its quarterly report on Form 10-Q filed with the Securities and Exchange Commission (the Commission) on August 12, 2026 (the Form 10-Q), plus (ii) 111,601,424 shares of Class B common stock (the Class B common stock) outstanding as of August 5, 2026, as reported by the Issuer in the Form 10-Q. The shares of Class A common stock and Class B common stock have the same rights, privileges, preferences, and powers, rank equally (including as to dividends and distributions, and upon any liquidation, dissolution, distribution of assets, or winding up of the Issuer), share ratably and are identical in all respects and as to all matters, except that the holders of shares of Class A common stock are entitled to one vote per share of Class A common stock and the holders of Class B common stock are entitled to twenty votes per share of Class B common stock. 0001675126 N Eclipse Continuity Fund I, L.P. b WC N DE 0 546645 0 546645 546645 N 0.2 PN Represents 546,645 shares of Class A common stock. All shares are held by Eclipse Continuity I. Eclipse Continuity GP is the general partner of Eclipse Continuity I and may be deemed to have voting and dispositive power over the shares held by Eclipse Continuity I. Mr. Susan, a member of the Issuer's Board, is the sole managing member of Eclipse Continuity GP and may be deemed to have voting and dispositive power with respect to these securities. Based on 223,848,533 shares of common stock outstanding, consisting of (i) 112,247,109 shares of Class A common stock, plus (ii) 111,601,424 shares of Class B common stock outstanding as of August 5, 2026, as reported by the Issuer in the Form 10-Q. The shares of Class A common stock and Class B common stock have the same rights, privileges, preferences, and powers, rank equally (including as to dividends and distributions, and upon any liquidation, dissolution, distribution of assets, or winding up of the Issuer), share ratably and are identical in all respects and as to all matters, except that the holders of shares of Class A common stock are entitled to one vote per share of Class A common stock and the holders of Class B common stock are entitled to twenty votes per share of Class B common stock. 0001843678 N Eclipse Ventures GP I, LLC b AF N DE 0 3768448 0 3768448 3768448 N 1.7 OO Represents 3,768,448 shares of Class A common stock. All shares are held by Eclipse I (as defined in Item 2(a)). Eclipse I GP (as defined in Item 2(a)) is the general partner of Eclipse I and may be deemed to have voting and dispositive power over the shares held by Eclipse I. Mr. Susan, a member of the Issuer's Board, is the sole managing member of Eclipse I GP and may be deemed to have voting and dispositive power with respect to these securities. Based on 223,848,533 shares of common stock outstanding, consisting of (i) 112,247,109 shares of Class A common stock, plus (ii) 111,601,424 shares of Class B common stock outstanding as of August 5, 2026, as reported by the Issuer in the Form 10-Q. The shares of Class A common stock and Class B common stock have the same rights, privileges, preferences, and powers, rank equally (including as to dividends and distributions, and upon any liquidation, dissolution, distribution of assets, or winding up of the Issuer), share ratably and are identical in all respects and as to all matters, except that the holders of shares of Class A common stock are entitled to one vote per share of Class A common stock and the holders of Class B common stock are entitled to twenty votes per share of Class B common stock. 0001641394 N Eclipse Ventures Fund I, L.P. b WC N DE 0 3768448 0 3768448 3768448 N 1.7 PN Represents 3,768,448 shares of Class A common stock. All shares are held by Eclipse I. Eclipse I GP is the general partner of Eclipse I and may be deemed to have voting and dispositive power over the shares held by Eclipse I. Mr. Susan, a member of the Issuer's Board, is the sole managing member of Eclipse I GP and may be deemed to have voting and dispositive power with respect to these securities. Based on 223,848,533 shares of common stock outstanding, consisting of (i) 112,247,109 shares of Class A common stock, plus (ii) 111,601,424 shares of Class B common stock outstanding as of August 5, 2026, as reported by the Issuer in the Form 10-Q. The shares of Class A common stock and Class B common stock have the same rights, privileges, preferences, and powers, rank equally (including as to dividends and distributions, and upon any liquidation, dissolution, distribution of assets, or winding up of the Issuer), share ratably and are identical in all respects and as to all matters, except that the holders of shares of Class A common stock are entitled to one vote per share of Class A common stock and the holders of Class B common stock are entitled to twenty votes per share of Class B common stock. Y Eclipse SPV II GP, LLC b AF N DE 0 4472603 0 4472603 4472603 N 2.0 OO Represents 4,472,603 shares of Class A common stock. All shares are held by Eclipse SPV II (as defined in Item 2(a)). Eclipse SPV II GP (as defined in Item 2(a)) is the general partner of Eclipse SPV II and may be deemed to have voting and dispositive power over the shares held by Eclipse SPV II. Mr. Susan, a member of the Issuer's Board, is the sole managing member of Eclipse SPV II GP and may be deemed to have voting and dispositive power with respect to these securities. Based on 223,848,533 shares of common stock outstanding, consisting of (i) 112,247,109 shares of Class A common stock, plus (ii) 111,601,424 shares of Class B common stock outstanding as of August 5, 2026, as reported by the Issuer in the Form 10-Q. The shares of Class A common stock and Class B common stock have the same rights, privileges, preferences, and powers, rank equally (including as to dividends and distributions, and upon any liquidation, dissolution, distribution of assets, or winding up of the Issuer), share ratably and are identical in all respects and as to all matters, except that the holders of shares of Class A common stock are entitled to one vote per share of Class A common stock and the holders of Class B common stock are entitled to twenty votes per share of Class B common stock. 0001791665 N Eclipse SPV II, L.P. b WC N DE 0 4472603 0 4472603 4472603 N 2.0 PN Represents 4,472,603 shares of Class A common stock. All shares are held by Eclipse SPV II. Eclipse SPV II GP is the general partner of Eclipse SPV II and may be deemed to have voting and dispositive power over the shares held by Eclipse SPV II. Mr. Susan, a member of the Issuer's Board, is the sole managing member of Eclipse SPV II GP and may be deemed to have voting and dispositive power with respect to these securities. Based on 223,848,533 shares of common stock outstanding, consisting of (i) 112,247,109 shares of Class A common stock, plus (ii) 111,601,424 shares of Class B common stock outstanding as of August 5, 2026, as reported by the Issuer in the Form 10-Q. The shares of Class A common stock and Class B common stock have the same rights, privileges, preferences, and powers, rank equally (including as to dividends and distributions, and upon any liquidation, dissolution, distribution of assets, or winding up of the Issuer), share ratably and are identical in all respects and as to all matters, except that the holders of shares of Class A common stock are entitled to one vote per share of Class A common stock and the holders of Class B common stock are entitled to twenty votes per share of Class B common stock. Y Eclipse SPV XIII GP, LLC b AF N DE 0 409719 0 409719 409719 N 0.2 OO Represents 409,719 shares of Class A common stock. All shares are held by Eclipse SPV XIII (as defined in Item 2(a)). Eclipse SPV XIII GP (as defined in Item 2(a)) is the general partner of Eclipse SPV XIII and may be deemed to have voting and dispositive power over the shares held by Eclipse SPV XIII. Mr. Susan, a member of the Issuer's Board, is the sole managing member of Eclipse SPV XIII GP and may be deemed to have voting and dispositive power with respect to these securities. Based on 223,848,533 shares of common stock outstanding, consisting of (i) 112,247,109 shares of Class A common stock, plus (ii) 111,601,424 shares of Class B common stock outstanding as of August 5, 2026, as reported by the Issuer in the Form 10-Q. The shares of Class A common stock and Class B common stock have the same rights, privileges, preferences, and powers, rank equally (including as to dividends and distributions, and upon any liquidation, dissolution, distribution of assets, or winding up of the Issuer), share ratably and are identical in all respects and as to all matters, except that the holders of shares of Class A common stock are entitled to one vote per share of Class A common stock and the holders of Class B common stock are entitled to twenty votes per share of Class B common stock. 0001943130 N Eclipse SPV XIII, L.P. b WC N DE 0 409719 0 409719 409719 N 0.2 PN Represents 409,719 shares of Class A common stock. All shares are held by Eclipse SPV XIII. Eclipse SPV XIII GP is the general partner of Eclipse SPV XIII and may be deemed to have voting and dispositive power over the shares held by Eclipse SPV XIII. Mr. Susan, a member of the Issuer's Board, is the sole managing member of Eclipse SPV XIII GP and may be deemed to have voting and dispositive power with respect to these securities. Based on 223,848,533 shares of common stock outstanding, consisting of (i) 112,247,109 shares of Class A common stock, plus (ii) 111,601,424 shares of Class B common stock outstanding as of August 5, 2026, as reported by the Issuer in the Form 10-Q. The shares of Class A common stock and Class B common stock have the same rights, privileges, preferences, and powers, rank equally (including as to dividends and distributions, and upon any liquidation, dissolution, distribution of assets, or winding up of the Issuer), share ratably and are identical in all respects and as to all matters, except that the holders of shares of Class A common stock are entitled to one vote per share of Class A common stock and the holders of Class B common stock are entitled to twenty votes per share of Class B common stock. 0001832895 N Lior Susan b AF N X1 358575 9197415 358575 9197415 9555990 N 4.3 IN Consists of (i) an aggregate of 197,784 shares of Class A common stock held by Mr. Susan, (ii) 160,791 shares of Class A common stock held by an estate-planning vehicle controlled by Mr. Susan, (iii) 546,645 shares of Class A common stock held by Eclipse Continuity I, (iv) 3,768,448 shares of Class A common stock held by Eclipse I, (v) 4,472,603 shares of Class A common stock held by Eclipse SPV II, and (vi) 409,719 shares of Class A common stock held by Eclipse SPV XIII. Eclipse Continuity GP is the general partner of Eclipse Continuity I and may be deemed to have voting and dispositive power over the shares held by Eclipse Continuity I. Eclipse I GP is the general partner of Eclipse I and may be deemed to have voting and dispositive power over the shares held by Eclipse I. Eclipse SPV II GP is the general partner of Eclipse SPV II and may be deemed to have voting and dispositive power over the shares held by Eclipse SPV II. Eclipse SPV XIII GP is the general partner of Eclipse SPV XIII and may be deemed to have voting and dispositive power over the shares held by Eclipse SPV XIII. Mr. Susan, a member of the Issuer's Board, is the sole managing member of each of Eclipse Continuity GP, Eclipse I GP, Eclipse SPV II GP, and Eclipse SPV XIII GP and may be deemed to have voting and dispositive power with respect to the shares held by each of Eclipse Continuity I, Eclipse I, Eclipse SPV II, and Eclipse SPV XIII. Based on 223,848,533 shares of common stock outstanding, consisting of (i) 112,247,109 shares of Class A common stock, plus (ii) 111,601,424 shares of Class B common stock outstanding as of August 5, 2026, as reported by the Issuer in the Form 10-Q. The shares of Class A common stock and Class B common stock have the same rights, privileges, preferences, and powers, rank equally (including as to dividends and distributions, and upon any liquidation, dissolution, distribution of assets, or winding up of the Issuer), share ratably and are identical in all respects and as to all matters, except that the holders of shares of Class A common stock are entitled to one vote per share of Class A common stock and the holders of Class B common stock are entitled to twenty votes per share of Class B common stock. Class A common stock, $0.00001 par value per share Cerebras Systems, Inc. 1237 E. Arques Avenue Sunnyvale CA 94085 Explanatory Note: This Amendment No. 2 amends and supplements the Schedule 13D originally filed with the Commission on May 22, 2026, as amended by Amendment No. 1 filed with the Commission on June 26, 2026 (the Original Schedule 13D) and is being filed by Eclipse Ventures Fund I, L.P. (Eclipse I), Eclipse Ventures GP I, LLC (Eclipse I GP), Eclipse Continuity Fund I, L.P. (Eclipse Continuity I), Eclipse Continuity GP I, LLC (Eclipse Continuity GP), Eclipse SPV II, L.P. (Eclipse SPV II), Eclipse SPV II GP, LLC (Eclipse SPV II GP), Eclipse SPV XIII, L.P. (Eclipse SPV XIII), Eclipse SPV XIII GP, LLC (Eclipse SPV XIII GP, and together with Eclipse I, Eclipse I GP, Eclipse Continuity I, Eclipse SPV II, Eclipse SPV II GP, Eclipse SPV XIII, the Reporting Entities) and Lior Susan (Mr. Susan), a member of the Issuer's board of directors (the Board). The Reporting Entities and Mr. Susan are collectively referred to as the Reporting Persons. The Reporting Persons expressly disclaim status as a group for purposes of this Schedule 13D. The agreement among the Reporting Persons to file jointly in accordance with the provisions of Rule 13d-1(k)(1) under the Act is attached to the Original Schedule 13D as Exhibit 1. Each Reporting Person disclaims beneficial ownership of all securities reported in this Statement except to the extent of such Reporting Person's pecuniary interest therein, other than those securities reported herein as being held directly by such Reporting Person. Only those items that are hereby reported are amended; all other items reported in the Original Schedule 13D remain unchanged. Information given in response to each item shall be deemed incorporated by reference in all other items, as applicable. Capitalized terms not defined in this Statement have the meanings ascribed to them in the Original Schedule 13D. The information set forth in Item 2(a) of the Original Schedule 13D is incorporated herein by reference. The information set forth in Item 2(b) of the Original Schedule 13D is incorporated herein by reference. The information set forth in Item 2(c) of the Original Schedule 13D is incorporated herein by reference. The information set forth in Item 2(d) of the Original Schedule 13D is incorporated herein by reference. The information set forth in Item 2(e) of the Original Schedule 13D is incorporated herein by reference. The information set forth in Item 2(f) of the Original Schedule 13D is incorporated herein by reference. Item 3 of the Original Schedule 13D is hereby amended by the addition of the following information: On August 14, 2026, each of Eclipse Continuity I, Eclipse I, Eclipse SPV II, and Eclipse SPV XIII engaged in a pro rata, in-kind distribution of (i) 133,660 shares of Class A common stock, (ii) 921,422 shares of Class A common stock, (iii) 1,093,594 shares of Class A common stock and (iv) 100,179 shares of Class A common stock, respectively, to their respective limited and general partners for no consideration (the "August 2026 Distribution"). Mr. Susan acquired an aggregate of 104,811 shares of Class A common stock from the Reporting Entities in the August 2026 Distribution and an estate-planning vehicle controlled by Mr. Susan received 119,816 shares of Class A common stock from the Reporting Entities in the August 2026 Distribution. Following the August 2026 Distribution, each Reporting Entity and Mr. Susan held the number of shares and percentages reported in Items 7-11 of the cover pages of this Amendment No. 2. The information set forth in Item 4 of the Original Schedule 13D is incorporated herein by reference. See Items 7-11 of the cover pages of this Statement and Item 2 above. Except to the extent of his or its pecuniary interest therein, each Reporting Person disclaims beneficial ownership of such shares of common stock, except for the shares, if any, such Reporting Person holds of record. See Items 7-11 of the cover pages of this Statement and Item 2 above. Except to the extent of his or its pecuniary interest therein, each Reporting Person disclaims beneficial ownership of such shares of common stock, except for the shares, if any, such Reporting Person holds of record. Except as reported in this Statement, none of the Reporting Persons has effected any transactions in the Issuer's securities within the past 60 days. The information set forth in Item 5(d) of the Original Schedule 13D is incorporated herein by reference. On August 14, 2026, the Reporting Persons ceased to be the beneficial owner of more than five percent of the outstanding shares of the Issuer. The information set forth in Item 6 of the Original Schedule 13D is incorporated herein by reference. Eclipse Continuity GP I, LLC /s/ Lior Susan 08/18/2026 Eclipse Continuity Fund I, L.P. /s/ Lior Susan 08/18/2026 Eclipse Ventures GP I, LLC /s/ Lior Susan 08/18/2026 Eclipse Ventures Fund I, L.P. /s/ Lior Susan 08/18/2026 Eclipse SPV II GP, LLC /s/ Lior Susan 08/18/2026 Eclipse SPV II, L.P. /s/ Lior Susan 08/18/2026 Eclipse SPV XIII GP, LLC /s/ Lior Susan 08/18/2026 Eclipse SPV XIII, L.P. /s/ Lior Susan 08/18/2026 Lior Susan /s/ Lior Susan 08/18/2026