X0306 4 2020-09-16 0 0001770787 10x Genomics, Inc. TXG 0001495384 Venrock Associates VI, L.P. C/O VENROCK 3340 HILLVIEW AVENUE PALO ALTO CA 94304 0 0 1 0 0001495386 Venrock Partners VI, L.P. C/O VENROCK, 3340 HILLVIEW AVENUE PALO ALTO CA 94304 0 0 1 0 0001495383 Venrock Management VI, LLC C/O VENROCK, 3340 HILLVIEW AVENUE PALO ALTO CA 94304 0 0 1 0 0001495385 Venrock Partners Management VI, LLC C/O VENROCK, 3340 HILLVIEW AVENUE PALO ALTO CA 94304 0 0 1 0 Class A Common Stock 2020-09-16 4 J 0 911981 0.00 D 375844 I By Funds Class A Common Stock 2020-09-18 4 J 0 338019 0.00 D 37825 I By Funds On September 16, 2020, Venrock Associates VI, L.P. ("VA VI") and Venrock Partners VI, L.P. ("VP VI") distributed an aggregate of 1,250,000 shares of Class A Common Stock to their limited partners and general partners pursuant to a Trading and Distribution Plan adopted on September 11, 2020 (the "Plan"). Pursuant to the terms of the Plan, of the 1,250,000 shares distributed, 313,898 shares were distributed by VA VI to its general partner, Venrock Management VI, LLC ("VM VI") and 24,121 shares were distributed by VP VI to its general partner, Venrock Partners Management VI, LLC ("VPM VI"). Consists of 35,085 shares of Class A Common Stock held by VA VI, 2,740 shares of Class A Common Stock held by VP VI, 313,898 shares of Class A Common Stock held by VM VI and 24,121 shares of Class A Common Stock held by VPM VI. On September 18, 2020, VM VI and VPM VI distributed an aggregate of 338,019 shares of Class A Common Stock to their members and participants pursuant to the Plan. Consists of 35,085 shares of Class A Common Stock held by VA VI and 2,740 shares of Class A Common Stock held by VP VI. /s/ David L. Stepp, Authorized Signatory 2020-09-18 David L. Stepp, Authorized Signatory 2020-09-18 David L. Stepp, Authorized Signatory 2020-09-18 David L. Stepp, Authorized Signatory 2020-09-18