Oscar Health, Inc.

(a)None.

(b) None.

(c) On February 12, 2026, R. Scott Blackley, the Company’s Chief Financial Officer, entered into a Rule 10b5-1 trading arrangement that is intended to satisfy the affirmative defense of Rule 10b5-1(c). Mr. Blackley’s plan is for the sale of up to 210,000 shares of Class A common stock through June 26, 2027. The plan terminates on the earlier of the date all the shares under the plan are sold and June 26, 2027. No trades will commence under the plan until after the expiration of the applicable cooling off period on May 14, 2026.

On March 24, 2026, Mario Schlosser, the Company’s Co-Founder and Chief Technology Officer, entered into a Rule 10b5-1 trading arrangement that is intended to satisfy the affirmative defense of Rule 10b5-1(c). Mr. Schlosser’s plan is for the exercise of vested stock options and the associated sale of up to 660,000 shares of Class B common stock, and the additional sale of up to 415,000 shares of Class B common stock, through June 30, 2027. The plan terminates on the earlier of the date all the shares under the plan are sold and June 30, 2027. No trades will commence under the plan until after the expiration of the applicable cooling off period on June 23, 2026.

As previously disclosed, on November 10, 2025, Mark T. Bertolini, the Company’s Chief Executive Officer, in accordance with the Company’s standard practice for employees and executive officers, entered into the Company’s form of sell-to-cover instruction that is intended to satisfy the affirmative defense of Rule 10b5-1(c), providing for sales of a number of shares of Class A common stock as is necessary to cover tax withholding obligations incurred in connection with the vesting or settlement of restricted stock units held by Mr. Bertolini. On March 24, 2026, Mr. Bertolini amended and restated the existing instruction to exclude the settlement of certain shares of Class A common stock from the instruction. The amended and restated instruction will remain in effect so long as Mr. Bertolini is subject to such tax obligations, unless earlier terminated. The total number of shares of Class A common stock that may be sold pursuant to the amended and restated instruction is not determinable.