144 0001352552 XXXXXXXX LIVE 0001568651 Oscar Health, Inc. 001-40154 75 Varick Street, 5th Floor New York NY 10013 646-403-3677 Mark Bertolini Director CEO Common Stock Morgan Stanley Smith Barney LLC

Executive Financial Services 1 New York Plaza, 8th Floor New York NY 10004

2776937 83113724.41 265902000 06/25/2026 NYSE Common Stock 04/03/2026 Performance stock units Issuer N 3774470 04/03/2026 Services Rendered Common Stock 04/03/2026 Restricted stock units vesting under a registered plan Issuer N 955555 04/03/2026 Services Rendered Y Represents a sale of shares to satisfy tax withholding obligations in connection with the deferred settlement of performance stock units and time-based restricted 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. 06/25/2026 03/24/2026 Melissa Curtin, Attorney-in-Fact for Mark Bertolini