X0609 4 2026-04-03 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 0 Class A Common Stock 2026-04-03 4 M 0 5733334 A 10196877 D Class A Common Stock 2026-04-06 4 F 0 1000001 11.92 D 9196876 D Class A Common Stock 2026-04-06 4 P 0 1000000 11.92 A 10196876 D Performance Restricted Stock Units 2026-04-03 4 M 0 5733334 0 D Class A Common Stock 5733334 0 D Represents performance stock units (PSUs) that vested based on achievement of specified price per share targets. Each PSU represents a contingent right to receive one share of Class A common stock. Includes shares to be issued in connection with the vesting of one or more restricted stock units. Represents shares withheld by the issuer to satisfy tax obligations with respect to the portion of PSUs settled on April 6, 2026. Settlement of the remaining PSUs and the restricted stock units that vested on April 3, 2026, and sales to cover the resulting tax obligations, will occur at a later date in accordance with a 10b5-1 instruction letter entered into by the reporting person on November 10, 2025, as amended and restated on March 24, 2026. Represents shares of Class A common stock purchased from the issuer by the reporting person in a private placement transaction. /s/ Melissa Curtin, Attorney-in-Fact 2026-04-07