X0609 4 2026-06-29 0 0001568651 Oscar Health, Inc. OSCR 0001352552 Bertolini Mark T false 75 VARICK STREET, 5TH FLOOR NEW YORK NY 10013 1 1 0 0 Chief Executive Officer 1 Class A Common Stock 2026-06-29 4 S 0 555826 29.17 D 8434740 D Class A Common Stock 2026-06-29 4 S 0 58926 30.08 D 8375814 D Class A Common Stock 2026-06-30 4 S 0 488654 28.35 D 7887160 D Class A Common Stock 2026-06-30 4 S 0 135590 28.97 D 7751570 D Represents sale of shares to satisfy tax withholding obligations in connection with the deferred settlement of performance stock units that vested on April 3, 2026. The sale was effected pursuant to a Rule 10b5-1 instruction letter entered into on November 10, 2025 and amended and restated on March 24, 2026. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $28.74 to $29.73, inclusive. The Reporting Person undertakes 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 sold at each separate price at which the transactions were effected. Includes shares to be issued in connection with the vesting of one or more restricted stock units. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $29.74 to $30.61, inclusive. The Reporting Person undertakes 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 sold at each separate price at which the transactions were effected. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $27.78 to $28.77, inclusive. The Reporting Person undertakes 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 sold at each separate price at which the transactions were effected. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $28.78 to $29.29, inclusive. The Reporting Person undertakes 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 sold at each separate price at which the transactions were effected. /s/ Melissa Curtin, Attorney-in-Fact 2026-07-01