X0609 4 2026-09-18 0001568651 Oscar Health, Inc. OSCR 0001844181 Kushner Joshua false 75 VARICK STREET, 5TH FLOOR NEW YORK NY 10013 true true true false Co-Founder and Vice Chairman false Class A Common Stock 2026-09-18 4 J false 6268097 0 D 0 I By Thrive Capital Partners VII Growth, L.P. Class A Common Stock 2026-09-18 4 J false 75520 0 D 0 I By Claremount VII Associates, L.P. Class A Common Stock 2026-09-18 4 J false 1323589 0 A 1323589 I By Thrive Capital Partners II, L.P. Class A Common Stock 2026-09-18 4 J false 4855810 0 A 4855810 I By Thrive Capital Partners III, L.P. Class A Common Stock 2026-09-18 4 J false 164218 0 A 164218 I By Claremount TW, L.P. Class A Common Stock 2026-09-18 4 J false 1323589 0 D 0 I By Thrive Capital Partners II, L.P. Class A Common Stock 2026-09-18 4 J false 4855810 0 D 0 I By Thrive Capital Partners III, L.P. Class A Common Stock 2026-09-18 4 J false 164218 0 D 0 I By Claremount TW, L.P. Class B Common Stock 2026-09-18 4 J false 1323589 0 D Class A Common Stock 1323589 4779730 I By Thrive Capital Partners II, L.P. Class B Common Stock 2026-09-18 4 J false 4855810 0 D Class A Common Stock 4855810 17535258 I By Thrive Capital Partners III, L.P. Class B Common Stock 2026-09-18 4 J false 164218 0 D Class A Common Stock 164218 593021 I By Claremount TW, L.P. Class B Common Stock 2026-09-18 4 J false 6268097 0 A Class A Common Stock 6268097 6268097 I By Thrive Capital Partners VII Growth, L.P. Class B Common Stock 2026-09-18 4 J false 75520 0 A Class A Common Stock 75520 75520 I By Claremount VII Associates, L.P. Class B Common Stock Class A Common Stock 1040704 1040704 I By Thrive Capital Partners V, L.P. Class B Common Stock Class A Common Stock 19239 19239 I By Claremount V Associates, L.P. Class B Common Stock Class A Common Stock 2498513 2498513 I By Thrive Capital Partners VI Growth, L.P. Class B Common Stock Class A Common Stock 48982 48982 I By Claremount VI Associates, L.P. On September 18, 2026, (i) Thrive Capital Partners II, L.P. ("Thrive II") transferred 1,307,831 and 15,758 shares of Class B Common Stock to Thrive Capital Partners VII Growth, L.P. ("Thrive VII Growth") and Claremount VII Associates, L.P. ("Claremount VII"), respectively, in exchange for 1,307,831 and 15,758 shares of Class A Common Stock held by Thrive VII Growth and Claremount VII, respectively; (ii) Thrive Capital Partners III, L.P. ("Thrive III") transferred 4,798,003 and 57,807 shares of Class B Common Stock to Thrive VII Growth and Claremount VII, respectively, in exchange for 4,798,003 and 57,807 shares of Class A Common Stock held by Thrive VII Growth and Claremount VII, respectively; (iii) Claremount TW, L.P. ("Claremount TW") transferred 162,263 and 1,955 shares of Class B Common Stock to Thrive VII Growth and Claremount VII, respectively, in exchange for 162,263 and 1,955 shares of Class A Common Stock held by Thrive VII Growth and Claremount VII, respectively. Thrive Partners II GP, LLC is the general partner of Thrive II; Thrive Partners III GP, LLC is the general partner of each of Thrive III and Claremount TW; Thrive Partners V GP, LLC is the general partner of each of Thrive Capital Partners V, L.P. ("Thrive V") and Claremount V Associates, L.P. ("Claremount V"); Thrive Partners VI GP, LLC is the general partner of each of Thrive Capital Partners VI Growth, L.P. ("Thrive VI Growth") and Claremount VI Associates, L.P. ("Claremount VI"); Thrive Partners VII Growth GP, LLC is the general partner of Thrive VII Growth; and Thrive Partners VII GP, LLC is the general partner of Claremount VII (together with Thrive II, Thrive III, Claremount TW, Thrive V, Claremount V, Thrive VI Growth, Claremount VI, Thrive VII Growth, the "Thrive Capital Funds"). (continued from footnote 2) Thrive Partners II GP, LLC, Thrive Partners III GP, LLC, Thrive Partners V GP, LLC, Thrive Partners VI GP, LLC, Thrive Partners VII Growth GP, LLC and Thrive Partners VII GP, LLC are collectively referred to as the "Thrive General Partners." Joshua Kushner is the sole managing member of each of the Thrive General Partners and, in his capacity as managing member, has voting and investment power over the shares held by each of the Thrive Capital Funds. Each of the foregoing entities and Mr. Kushner disclaims beneficial ownership of the shares held of record by the Thrive Capital Funds, except to the extent of its or his pecuniary interest therein. On September 18, 2026, (i) Thrive II distributed to its limited partners and sole general partner, pro rata and without consideration, 1,323,589 shares of Class A Common Stock; (ii) Thrive III distributed to its limited partners and sole general partner, pro rata and without consideration, 4,855,810 shares of Class A Common Stock; and (iii) Claremount TW distributed to its limited partners and sole general partner, pro rata and without consideration, 164,218 shares of Class A Common Stock. Each of Thrive Partners II GP, LLC and Thrive Partners III GP, LLC, in turn, distributed to their members, pro rata and without consideration, the shares of Class A Common Stock received in the foregoing distributions. Such distributions were made in accordance with the exemptions afforded by Rule 16a-9(a) and Rule 16a-13 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). The Class B Common Stock is convertible at any time at the option of the holder into Class A Common Stock on a one-to-one basis, subject to certain exceptions, and will mandatorily convert into Class A Common Stock on the date that is seven years from the date of the prospectus used in connection with the Issuer's initial public offering and upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. /s/ Joshua Kushner 2026-09-18