X0609 4 2026-09-03 0 0001568651 Oscar Health, Inc. OSCR 0001844320 Schlosser Mario false 75 VARICK STREET, 5TH FLOOR NEW YORK NY 10013 1 0 0 0 1 Class A Common Stock 2026-09-03 4 S 0 31422 31.45 D 449444 D The sale was effected pursuant to a Rule 10b5-1 instruction letter entered into on August 8, 2025 to satisfy the Reporting Person's tax withholding obligation upon the vesting of previously granted equity awards. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.97 to $31.96, 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. /s/ Melissa Curtin, Attorney-in-fact 2026-09-08