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The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001567929-26-000003","document":"form4-08182026_100849.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/2021728/000156792926000003/form4-08182026_100849.xml","form_type":"4"}},{"id":683899,"issuer":{"id":3072,"kind":"organization","name":"Cerebras Systems Inc.","symbol":"CBRS"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-08-18T22:38:56.000Z","date":"2026-08-14","kind":"other","planned":false,"acquired":false,"shares":37453,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Foundation Capital VIII Principals Fund, L.L.C."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F6","text":"Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by FC8P to its general partner and limited partners without additional consideration."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities are directly held by Foundation Capital VIII Principals Fund, L.L.C. (\"FC8P\"). Foundation Capital Management Co. VIII, L.L.C. (\"FCM8\") is the manager of FC8P. The Reporting Person is a manager of FCM8 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001567929-26-000003","document":"form4-08182026_100849.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/2021728/000156792926000003/form4-08182026_100849.xml","form_type":"4"}},{"id":683898,"issuer":{"id":3072,"kind":"organization","name":"Cerebras Systems Inc.","symbol":"CBRS"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-08-18T22:38:56.000Z","date":"2026-08-14","kind":"other","planned":false,"acquired":false,"shares":1738913,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Foundation Capital VIII, L.P."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by FC8 to its general partner and limited partners without additional consideration."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Securities are directly held by Foundation Capital VIII, L.P. 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The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001567929-26-000003","document":"form4-08182026_100849.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/2021728/000156792926000003/form4-08182026_100849.xml","form_type":"4"}},{"id":683897,"issuer":{"id":3072,"kind":"organization","name":"Cerebras Systems Inc.","symbol":"CBRS"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-08-18T22:38:56.000Z","date":"2026-08-14","kind":"exercise","planned":false,"acquired":true,"shares":27285,"ownership":{"direct":false,"nature":"By Foundation Capital Leadership Fund II, L.P."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Securities are directly held by Foundation Capital Leadership Fund II, L.P. (\"FCLF2\"). Foundation Capital Management Co. LF II, L.L.C. (\"FCMLF2\") is the general partner of FCLF2. The Reporting Person is a manager of FCMLF2 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein."}],"balance_after":136426,"source":{"system":"sec-edgar","filing":"0001567929-26-000003","document":"form4-08182026_100849.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/2021728/000156792926000003/form4-08182026_100849.xml","form_type":"4"}},{"id":683896,"issuer":{"id":3072,"kind":"organization","name":"Cerebras Systems Inc.","symbol":"CBRS"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-08-18T22:38:56.000Z","date":"2026-08-14","kind":"exercise","planned":false,"acquired":true,"shares":7490,"ownership":{"direct":false,"nature":"By Foundation Capital VIII Principals Fund, L.L.C."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities are directly held by Foundation Capital VIII Principals Fund, L.L.C. 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The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein."}],"balance_after":37453,"source":{"system":"sec-edgar","filing":"0001567929-26-000003","document":"form4-08182026_100849.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/2021728/000156792926000003/form4-08182026_100849.xml","form_type":"4"}},{"id":683895,"issuer":{"id":3072,"kind":"organization","name":"Cerebras Systems Inc.","symbol":"CBRS"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-08-18T22:38:56.000Z","date":"2026-08-14","kind":"exercise","planned":false,"acquired":true,"shares":347782,"ownership":{"direct":false,"nature":"By Foundation Capital VIII, L.P."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Securities are directly held by Foundation Capital VIII, L.P. 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The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein."}],"balance_after":1738913,"source":{"system":"sec-edgar","filing":"0001567929-26-000003","document":"form4-08182026_100849.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/2021728/000156792926000003/form4-08182026_100849.xml","form_type":"4"}},{"id":683894,"issuer":{"id":3072,"kind":"organization","name":"Cerebras Systems Inc.","symbol":"CBRS"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-08-18T22:38:56.000Z","date":"2026-06-24","kind":"exercise","planned":false,"acquired":true,"shares":109141,"ownership":{"direct":false,"nature":"By Foundation Capital Leadership Fund II, L.P."},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration."}],"balance_after":109141,"source":{"system":"sec-edgar","filing":"0001567929-26-000003","document":"form4-08182026_100849.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2021728/000156792926000003/form4-08182026_100849.xml","form_type":"4"}},{"id":683893,"issuer":{"id":3072,"kind":"organization","name":"Cerebras Systems Inc.","symbol":"CBRS"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-08-18T22:38:56.000Z","date":"2026-06-24","kind":"exercise","planned":false,"acquired":true,"shares":29963,"ownership":{"direct":false,"nature":"By Foundation Capital VIII Principals Fund, LLC"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Class B Common Stock was converted into one share of Class A Common Stock for no additional consideration."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities are directly held by Foundation Capital VIII Principals Fund, L.L.C. 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(\"FC8\"). Foundation Capital Management Co. VIII, L.L.C. (\"FCM8\") is the general partner of FC8. The Reporting Person is a manager of FCM8 and may be deemed to beneficially own such shares. The Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein."}],"balance_after":1391131,"source":{"system":"sec-edgar","filing":"0001567929-26-000003","document":"form4-08182026_100849.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2021728/000156792926000003/form4-08182026_100849.xml","form_type":"4"}},{"id":777385,"issuer":{"id":3072,"kind":"organization","name":"Cerebras Systems Inc.","symbol":"CBRS"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class B Common Stock","published_at":"2026-05-15T22:50:23.000Z","date":"2026-05-15","kind":"exercise","planned":false,"acquired":true,"shares":15302343,"ownership":{"direct":false,"nature":"See footnotes:"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Foundation Capital Management Co. VIII, L.L.C. is the General Partner of Foundation Capital VIII and the Manager of Foundation Capital VIII Principals and has sole voting and investment power with respect to the securities held by Foundation Capital VIII and Foundation Capital Principals. Steven P. Vassallo is a Manager of Foundation Capital Management Co. VIII, L.L.C. and may be deemed to beneficially own such shares. Foundation Capital Management Co. LF II, L.L.C. is the General Partner of Foundation Capital Leadership Fund and has sole voting and investment power with respect to the securities held by Foundation Capital Leadership Fund. Mr. Vassallo is a Manager of Foundation Capital Management Co. LF II, L.L.C. and may be deemed to beneficially own such shares. Mr. Vassallo disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Following the transactions reported herein, consists of (i) 1,091,411 shares of Class B common stock held by Foundation Leadership Fund, (ii) 299,627 shares of Class B common stock held by Foundation Capital VIII Principals, and (iii) 13,911,305 shares of Class B common stock held by Foundation Capital VIII."}],"balance_after":15302343,"derivative":{"underlying":"Class A Common Stock","underlying_shares":15302343},"source":{"system":"sec-edgar","filing":"0001628280-26-035744","document":"wk-form4_1778885420.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/2021728/000162828026035744/wk-form4_1778885420.xml","form_type":"4"}},{"id":777384,"issuer":{"id":3072,"kind":"organization","name":"Cerebras Systems Inc.","symbol":"CBRS"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Series E Preferred Stock","published_at":"2026-05-15T22:50:23.000Z","date":"2026-05-15","kind":"exercise","planned":false,"acquired":false,"shares":1145981,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Consists of (i) 1,091,411 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital Leadership Fund II, L.P. (\"Foundation Leadership Fund\"); (ii) 265,414 shares of Class B common stock underlying Series A Preferred Stock, 30,053 shares of Class B common stock underlying Series B Preferred Stock, 2,356 shares of Class B common stock underlying Series C Preferred Stock, 653 shares of Class B common stock underlying Series D Preferred Stock, and 1,151 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital VIII Principals Fund, LLC (\"Foundation Capital VIII Principals\");...(continued in footnote 3)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"(continued from footnote 2)...and (iii) 12,322,821 shares of Class B common stock underlying Series A Preferred Stock, 1,395,341 shares of Class B common stock underlying Series B Preferred Stock, 109,409 shares of Class B common stock underlying Series C Preferred Stock, 30,315 shares of Class B common stock underlying Series D Preferred Stock, and 53,419 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital VIII, L.P. (\"Foundation Capital VIII,\" and together with Foundation Leadership Fund and Foundation Capital VIII Principals, \"Foundation Capital\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Foundation Capital Management Co. VIII, L.L.C. is the General Partner of Foundation Capital VIII and the Manager of Foundation Capital VIII Principals and has sole voting and investment power with respect to the securities held by Foundation Capital VIII and Foundation Capital Principals. Steven P. Vassallo is a Manager of Foundation Capital Management Co. VIII, L.L.C. and may be deemed to beneficially own such shares. Foundation Capital Management Co. LF II, L.L.C. is the General Partner of Foundation Capital Leadership Fund and has sole voting and investment power with respect to the securities held by Foundation Capital Leadership Fund. Mr. Vassallo is a Manager of Foundation Capital Management Co. LF II, L.L.C. and may be deemed to beneficially own such shares. Mr. Vassallo disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Class B Common Stock","underlying_shares":1145981},"source":{"system":"sec-edgar","filing":"0001628280-26-035744","document":"wk-form4_1778885420.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/2021728/000162828026035744/wk-form4_1778885420.xml","form_type":"4"}},{"id":777383,"issuer":{"id":3072,"kind":"organization","name":"Cerebras Systems Inc.","symbol":"CBRS"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Series D Preferred Stock","published_at":"2026-05-15T22:50:23.000Z","date":"2026-05-15","kind":"exercise","planned":false,"acquired":false,"shares":30968,"ownership":{"direct":false,"nature":"See footnotes:"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Consists of (i) 1,091,411 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital Leadership Fund II, L.P. (\"Foundation Leadership Fund\"); (ii) 265,414 shares of Class B common stock underlying Series A Preferred Stock, 30,053 shares of Class B common stock underlying Series B Preferred Stock, 2,356 shares of Class B common stock underlying Series C Preferred Stock, 653 shares of Class B common stock underlying Series D Preferred Stock, and 1,151 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital VIII Principals Fund, LLC (\"Foundation Capital VIII Principals\");...(continued in footnote 3)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"(continued from footnote 2)...and (iii) 12,322,821 shares of Class B common stock underlying Series A Preferred Stock, 1,395,341 shares of Class B common stock underlying Series B Preferred Stock, 109,409 shares of Class B common stock underlying Series C Preferred Stock, 30,315 shares of Class B common stock underlying Series D Preferred Stock, and 53,419 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital VIII, L.P. (\"Foundation Capital VIII,\" and together with Foundation Leadership Fund and Foundation Capital VIII Principals, \"Foundation Capital\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Foundation Capital Management Co. VIII, L.L.C. is the General Partner of Foundation Capital VIII and the Manager of Foundation Capital VIII Principals and has sole voting and investment power with respect to the securities held by Foundation Capital VIII and Foundation Capital Principals. Steven P. Vassallo is a Manager of Foundation Capital Management Co. VIII, L.L.C. and may be deemed to beneficially own such shares. Foundation Capital Management Co. LF II, L.L.C. is the General Partner of Foundation Capital Leadership Fund and has sole voting and investment power with respect to the securities held by Foundation Capital Leadership Fund. Mr. Vassallo is a Manager of Foundation Capital Management Co. LF II, L.L.C. and may be deemed to beneficially own such shares. Mr. Vassallo disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Class B Common Stock","underlying_shares":30968},"source":{"system":"sec-edgar","filing":"0001628280-26-035744","document":"wk-form4_1778885420.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/2021728/000162828026035744/wk-form4_1778885420.xml","form_type":"4"}},{"id":777382,"issuer":{"id":3072,"kind":"organization","name":"Cerebras Systems Inc.","symbol":"CBRS"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Series C Preferred Stock","published_at":"2026-05-15T22:50:23.000Z","date":"2026-05-15","kind":"exercise","planned":false,"acquired":false,"shares":111765,"ownership":{"direct":false,"nature":"See footnotes:"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Consists of (i) 1,091,411 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital Leadership Fund II, L.P. (\"Foundation Leadership Fund\"); (ii) 265,414 shares of Class B common stock underlying Series A Preferred Stock, 30,053 shares of Class B common stock underlying Series B Preferred Stock, 2,356 shares of Class B common stock underlying Series C Preferred Stock, 653 shares of Class B common stock underlying Series D Preferred Stock, and 1,151 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital VIII Principals Fund, LLC (\"Foundation Capital VIII Principals\");...(continued in footnote 3)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"(continued from footnote 2)...and (iii) 12,322,821 shares of Class B common stock underlying Series A Preferred Stock, 1,395,341 shares of Class B common stock underlying Series B Preferred Stock, 109,409 shares of Class B common stock underlying Series C Preferred Stock, 30,315 shares of Class B common stock underlying Series D Preferred Stock, and 53,419 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital VIII, L.P. (\"Foundation Capital VIII,\" and together with Foundation Leadership Fund and Foundation Capital VIII Principals, \"Foundation Capital\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Foundation Capital Management Co. VIII, L.L.C. is the General Partner of Foundation Capital VIII and the Manager of Foundation Capital VIII Principals and has sole voting and investment power with respect to the securities held by Foundation Capital VIII and Foundation Capital Principals. Steven P. Vassallo is a Manager of Foundation Capital Management Co. VIII, L.L.C. and may be deemed to beneficially own such shares. Foundation Capital Management Co. LF II, L.L.C. is the General Partner of Foundation Capital Leadership Fund and has sole voting and investment power with respect to the securities held by Foundation Capital Leadership Fund. Mr. Vassallo is a Manager of Foundation Capital Management Co. LF II, L.L.C. and may be deemed to beneficially own such shares. Mr. Vassallo disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Class B Common Stock","underlying_shares":111765},"source":{"system":"sec-edgar","filing":"0001628280-26-035744","document":"wk-form4_1778885420.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2021728/000162828026035744/wk-form4_1778885420.xml","form_type":"4"}},{"id":777381,"issuer":{"id":3072,"kind":"organization","name":"Cerebras Systems Inc.","symbol":"CBRS"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Series B Preferred Stock","published_at":"2026-05-15T22:50:23.000Z","date":"2026-05-15","kind":"exercise","planned":false,"acquired":false,"shares":1425394,"ownership":{"direct":false,"nature":"See footnotes:"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Consists of (i) 1,091,411 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital Leadership Fund II, L.P. (\"Foundation Leadership Fund\"); (ii) 265,414 shares of Class B common stock underlying Series A Preferred Stock, 30,053 shares of Class B common stock underlying Series B Preferred Stock, 2,356 shares of Class B common stock underlying Series C Preferred Stock, 653 shares of Class B common stock underlying Series D Preferred Stock, and 1,151 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital VIII Principals Fund, LLC (\"Foundation Capital VIII Principals\");...(continued in footnote 3)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"(continued from footnote 2)...and (iii) 12,322,821 shares of Class B common stock underlying Series A Preferred Stock, 1,395,341 shares of Class B common stock underlying Series B Preferred Stock, 109,409 shares of Class B common stock underlying Series C Preferred Stock, 30,315 shares of Class B common stock underlying Series D Preferred Stock, and 53,419 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital VIII, L.P. (\"Foundation Capital VIII,\" and together with Foundation Leadership Fund and Foundation Capital VIII Principals, \"Foundation Capital\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Foundation Capital Management Co. VIII, L.L.C. is the General Partner of Foundation Capital VIII and the Manager of Foundation Capital VIII Principals and has sole voting and investment power with respect to the securities held by Foundation Capital VIII and Foundation Capital Principals. Steven P. Vassallo is a Manager of Foundation Capital Management Co. VIII, L.L.C. and may be deemed to beneficially own such shares. Foundation Capital Management Co. LF II, L.L.C. is the General Partner of Foundation Capital Leadership Fund and has sole voting and investment power with respect to the securities held by Foundation Capital Leadership Fund. Mr. Vassallo is a Manager of Foundation Capital Management Co. LF II, L.L.C. and may be deemed to beneficially own such shares. Mr. Vassallo disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Class B Common Stock","underlying_shares":1425394},"source":{"system":"sec-edgar","filing":"0001628280-26-035744","document":"wk-form4_1778885420.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2021728/000162828026035744/wk-form4_1778885420.xml","form_type":"4"}},{"id":777380,"issuer":{"id":3072,"kind":"organization","name":"Cerebras Systems Inc.","symbol":"CBRS"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Series A Preferred Stock","published_at":"2026-05-15T22:50:23.000Z","date":"2026-05-15","kind":"exercise","planned":false,"acquired":false,"shares":12588235,"ownership":{"direct":false,"nature":"See footnotes:"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F1","text":"Immediately prior to the closing of the Issuer's initial public offering, each share of the Issuer's redeemable convertible preferred stock automatically converted and was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Consists of (i) 1,091,411 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital Leadership Fund II, L.P. (\"Foundation Leadership Fund\"); (ii) 265,414 shares of Class B common stock underlying Series A Preferred Stock, 30,053 shares of Class B common stock underlying Series B Preferred Stock, 2,356 shares of Class B common stock underlying Series C Preferred Stock, 653 shares of Class B common stock underlying Series D Preferred Stock, and 1,151 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital VIII Principals Fund, LLC (\"Foundation Capital VIII Principals\");...(continued in footnote 3)"},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"(continued from footnote 2)...and (iii) 12,322,821 shares of Class B common stock underlying Series A Preferred Stock, 1,395,341 shares of Class B common stock underlying Series B Preferred Stock, 109,409 shares of Class B common stock underlying Series C Preferred Stock, 30,315 shares of Class B common stock underlying Series D Preferred Stock, and 53,419 shares of Class B common stock underlying Series E Preferred Stock held by Foundation Capital VIII, L.P. (\"Foundation Capital VIII,\" and together with Foundation Leadership Fund and Foundation Capital VIII Principals, \"Foundation Capital\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Foundation Capital Management Co. VIII, L.L.C. is the General Partner of Foundation Capital VIII and the Manager of Foundation Capital VIII Principals and has sole voting and investment power with respect to the securities held by Foundation Capital VIII and Foundation Capital Principals. Steven P. Vassallo is a Manager of Foundation Capital Management Co. VIII, L.L.C. and may be deemed to beneficially own such shares. Foundation Capital Management Co. LF II, L.L.C. is the General Partner of Foundation Capital Leadership Fund and has sole voting and investment power with respect to the securities held by Foundation Capital Leadership Fund. Mr. Vassallo is a Manager of Foundation Capital Management Co. LF II, L.L.C. and may be deemed to beneficially own such shares. Mr. Vassallo disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Class B Common Stock","underlying_shares":12588235},"source":{"system":"sec-edgar","filing":"0001628280-26-035744","document":"wk-form4_1778885420.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2021728/000162828026035744/wk-form4_1778885420.xml","form_type":"4"}},{"id":3578382,"issuer":{"id":4507,"kind":"organization","name":"Sunrun Inc.","symbol":"RUN"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-03-27T00:09:24.000Z","date":"2019-03-25","kind":"grant","acquired":true,"shares":3906,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Each share is represented by a Restricted Stock Unit (\"RSU\"). The RSUs will fully vest on January 1, 2020, subject to the Reporting Person's continued service as of that date."}],"balance_after":43716,"source":{"system":"sec-edgar","filing":"0001209191-19-021375","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1469367/000120919119021375/doc4.xml","form_type":"4"}},{"id":3612246,"issuer":{"id":4507,"kind":"organization","name":"Sunrun Inc.","symbol":"RUN"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-03-06T00:25:16.000Z","date":"2019-03-01","kind":"sale","acquired":false,"shares":39533,"price":16.04,"value":634109.32,"ownership":{"direct":false,"nature":"Vassallo Family Revocable Trust dated 7/15/02"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was $16.00 to $16.07 per share. The Reporting Person undertakes to provide, upon request by the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.  Transaction pursuant to a 10b5-1 Plan adopted on August 31, 2018."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The shares are held by the Vassallo Family Revocable Trust dated 7/15/02 (the \"Vassallo Family Trust\"). Steve P. Vassallo is a trustee of the Vassallo Family Trust. The Reporting Person disclaims beneficial ownership of the shares held by the Vassallo Family Trust except to the extent of his proportionate pecuniary interest therein."}],"balance_after":124893,"source":{"system":"sec-edgar","filing":"0001209191-19-017072","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1469367/000120919119017072/doc4.xml","form_type":"4"}},{"id":3628995,"issuer":{"id":4507,"kind":"organization","name":"Sunrun Inc.","symbol":"RUN"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-02-27T22:49:43.000Z","date":"2019-02-25","kind":"sale","acquired":false,"shares":7726,"price":16,"value":123616.0,"ownership":{"direct":false,"nature":"Vassallo Family Revocable Trust dated 7/15/02"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was $16.00 to $16.02 per share. The Reporting Person undertakes to provide, upon request by the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.  Transaction pursuant to a 10b5-1 Plan adopted on August 31, 2018."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The shares are held by the Vassallo Family Revocable Trust dated 7/15/02 (the \"Vassallo Family Trust\"). Steve P. Vassallo is a trustee of the Vassallo Family Trust. 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VI, L.L.C."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"Represents a change in the form of ownership from indirect to direct by virtue of the receipt of shares in the pro-rata in-kind distribution of Common Stock of the Issuer by FC VI described in footnote 1 above."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"FCM VI is the sole general partner of FC VI, and has sole voting and investment power with respect to the shares held by FC VI. The Reporting Person is a managing member of FCM VI, and may be deemed to share voting and investment power over the shares owned by FC VI. The Reporting Person disclaims beneficial ownership in the shares held by the aforementioned entities except to the extent of his pecuniary interest therein."}],"balance_after":288400,"source":{"system":"sec-edgar","filing":"0001209191-18-041826","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1469367/000120919118041826/doc4.xml","form_type":"4"}},{"id":3871772,"issuer":{"id":4507,"kind":"organization","name":"Sunrun Inc.","symbol":"RUN"},"owners":[{"id":19985,"kind":"person","name":"Vassallo Steven","position":1,"cik":"0001567929","reported_name":"Vassallo Steven","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2018-07-06T14:38:24.000Z","date":"2018-07-05","kind":"other","acquired":false,"shares":1120000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Foundation Capital VI, L.P."},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents a pro-rata in-kind distribution of Common Stock of the Issuer by Foundation Capital VI, L.P. (\"FC VI\") effected following the close of the trading market on July 5, 2018 without consideration to its limited partners and its general partner, Foundation Capital Management Co. VI, L.L.C. (\"FCM VI\").  Transaction pursuant to a 10b5-1 Plan adopted on May 31, 2018."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"FCM VI is the sole general partner of FC VI, and has sole voting and investment power with respect to the shares held by FC VI. The Reporting Person is a managing member of FCM VI, and may be deemed to share voting and investment power over the shares owned by FC VI. The Reporting Person disclaims beneficial ownership in the shares held by the aforementioned entities except to the extent of his pecuniary interest therein."}],"balance_after":4621468,"source":{"system":"sec-edgar","filing":"0001209191-18-041826","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1469367/000120919118041826/doc4.xml","form_type":"4"}}],"next_cursor":"2018-07-06T14:38:24.000000Z,3871772"}