X0306 4 2021-08-20 0 0001568651 Oscar Health, Inc. OSCR 0001877735 Thrive Partners VII Growth GP, LLC C/O THRIVE CAPITAL, 295 LAFAYETTE STREET, SUITE 701 NEW YORK NY 10012 0 0 1 0 0001841736 Thrive Capital Partners VII Growth, L.P. C/O THRIVE CAPITAL, 295 LAFAYETTE STREET, SUITE 701 NEW YORK NY 10012 0 0 1 0 0001877733 Thrive Partners VII GP, LLC C/O THRIVE CAPITAL, 295 LAFAYETTE STREET, SUITE 701 NEW YORK NY 10012 0 0 1 0 0001841808 Claremount VII Associates, L.P. C/O THRIVE CAPITAL, 295 LAFAYETTE STREET, SUITE 701 NEW YORK NY 10012 0 0 1 0 Class A Common Stock 2021-08-20 4 P 0 68042 13.4122 A 68542 I See footnote Class A Common Stock 2021-08-23 4 P 0 125900 13.0104 A 194442 I See footnote Class A Common Stock 2021-08-24 4 P 0 1074342 12.69 A 1268784 I See footnote Represents (i) 67,232 shares purchased by Thrive Capital Partners VII Growth, L.P. ("Thrive VII Growth") and (ii) 810 shares purchased by Claremount VII Associates, L.P. ("Claremount VII"). The price reported in Column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $13.12 to $13.53, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price at which the transactions were effected. All shares were purchased in accordance with the daily volume and other limitations and requirements of Rule 10b-18. Shares held directly by Thrive VII Growth and Claremount VII. Thrive Partners VII Growth GP, LLC ("Thrive Partners VII Growth") is the general partner of Thrive VII Growth. Thrive Partners VII GP, LLC ("Thrive Partners VII") is the general partner of Claremount VII. Joshua Kushner is the sole managing member of each of Thrive Partners VII Growth and Thrive Partners VII and, in his capacity as managing member, has voting and investment power over the shares held by each of Thrive VII Growth and Claremount VII. Each of the foregoing entities and Mr. Kushner disclaim beneficial ownership of the shares held of record by Thrive VII Growth and Claremount VII except to the extent of their pecuniary interest therein. Represents (i) 124,401 shares purchased by Thrive VII Growth and (ii) 1,499 shares purchased by Claremount VII. The price reported in Column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $12.83 to $13.29, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price at which the transactions were effected. All shares were purchased in accordance with the daily volume and other limitations and requirements of Rule 10b-18. Represents (i) 1,061,552 shares purchased by Thrive VII Growth and (ii) 12,790 shares purchased by Claremount VII. All shares were purchased in accordance with the daily volume and other limitations and requirements of Rule 10b-18. THRIVE PARTNERS VII GROWTH GP, LLC, By: /s/ Joshua Kushner, Managing Member 2021-08-24 THRIVE CAPITAL PARTNERS VII GROWTH, L.P., By: Thrive Partners VII Growth GP, LLC, By: /s/ Joshua Kushner, Managing Member 2021-08-24 THRIVE PARTNERS VII GP, LLC, By: /s/ Joshua Kushner, Managing Member 2021-08-24 CLAREMOUNT VII ASSOCIATES, L.P., By: Thrive Partners VII GP, LLC, By: /s/ Joshua Kushner, Managing Member 2021-08-24