X0306 4 2019-06-24 0 0001527753 Personalis, Inc. PSNL 0001573991 Ninth MDV Partners, L.L.C. 777 MARINERS ISLAND BOULEVARD SUITE 550 SAN MATEO CA 94404 0 0 1 0 0001410787 MDV IX LP 777 MARINERS ISLAND BOULEVARD SUITE 550 SAN MATEO CA 0 0 1 0 0001435083 MDV ENF IX LP 777 MARINERS ISLAND BOULEVARD SUITE 550 SAN MATEO CA 94404 0 0 1 0 0001027621 FEIBER JONATHAN D 777 MARINERS ISLAND BOULEVARD SUITE 550 SAN MATEO CA 94404 0 0 1 0 0001503381 Ericson William W. 777 MARINERS ISLAND BOULEVARD SUITE 550 SAN MATEO CA 94404 0 0 1 0 Common Stock 2019-06-24 4 C 0 2288805 A 2288805 I See Footnote Common Stock 2019-06-24 4 C 0 107812 A 2396617 I See Footnote Common Stock 2019-06-24 4 C 0 61592 A 2458209 I See Footnote Common Stock 2019-06-24 4 C 0 18739 A 18739 I See Footnote Common Stock 2019-06-24 4 C 0 882 A 19621 I See Footnote Common Stock 2019-06-24 4 C 0 504 A 20125 I See Footnote Common Stock 2019-06-24 4 C 0 127504 A 127504 I See Footnote Series A Convertible Preferred Stock 2019-06-24 4 C 0 2288805 0.00 D Common Stock 2288805 0 I See Footnote Series A Convertible Preferred Stock 2019-06-24 4 C 0 18739 0.00 D Common Stock 18739 0 I See Footnote Series B Convertible Preferred Stock 2019-06-24 4 C 0 107812 0.00 D Common Stock 107812 0 I See Footnote Series B Convertible Preferred Stock 2019-06-24 4 C 0 882 0.00 D Common Stock 882 0 I See Footnote Series C Convertible Preferred Stock 2019-06-24 4 C 0 61592 0.00 D Common Stock 61592 0 I See Footnote Series C Convertible Preferred Stock 2019-06-24 4 C 0 504 0.00 D Common Stock 504 0 I See Footnote Series C Convertible Preferred Stock 2019-06-24 4 C 0 127504 0.00 D Common Stock 127504 0 I See Footnote The Series A Convertible Preferred Stock, Series B Convertible Preferred Stock and Series C Convertible Preferred Stock automatically converted into Common Stock on a 1-for-1 basis immediately upon the closing of the Issuer's initial public offering and have no expiration date. These shares are held directly by MDV IX, L.P. ("MDV IX"). Ninth MDV Partners, L.L.C. ("Ninth MDV") is the general partner of MDV IX. Jonathan Feiber and William Ericson are the managing members of Ninth MDV and either are deemed to have sole voting and dispositive power with respect to the shares held by MDV IX. Each disclaims beneficial ownership of these securities except to the extent of his or its respective pecuniary interest therein. These shares are held directly by MDV ENF IX, L.P. ("ENF IX"). Ninth MDV is the general partner of ENF IX. Jonathan Feiber and William Ericson are the managing members of Ninth MDV and either are deemed to have sole voting and dispositive power with respect to the shares held by ENF IX. Each disclaims beneficial ownership of these securities except to the extent of his or its respective pecuniary interest therein. These shares are held directly by MDV IX, L.P., as nominee for MDV IX, L.P. and MDV ENF IX, L.P. ("IX Funds"). Ninth MDV is the general partner of IX Funds. Jonathan Feiber and William Ericson are the managing members of Ninth MDV and either are deemed to have sole voting and dispositive power with respect to the shares held by IX Funds. Each disclaims beneficial ownership of these securities except to the extent of his or its respective pecuniary interest therein. /s/ Ninth MDV Partners, L.L.C., By: Brett Teele, Authorized Signatory 2019-06-26 /s/ MDV IX, L.P., By: Ninth MDV Partners, L.L.C., its General Partner, By: Brett Teele, Authorized Signatory 2019-06-26 /s/ MDV ENF IX, L.P., By: Ninth MDV Partners, L.L.C., its General Partner, By: Brett Teele, Authorized Signatory 2019-06-26 /s/ Jonathan Feiber 2019-06-26 /s/ William Ericson 2019-06-26