Oklo Inc.

Rule 10b5-1 Trading Arrangements

Except as stated below, no director or officer (as defined in Rule 16a-1(f) under the Exchange Act) of the Company, adopted, modified, orterminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408 of Regulation S-K, during the three months ended December 31, 2025.

On December 15, 2025, William Goodwin, the Company’s Chief Legal and Strategy Officer, adopted a Rule 10b5-1 trading arrangement (the “Trading Arrangement”) intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act. The Trading Arrangement is intended to provide for “eligible sell-to-cover transactions” (as described in Rule 10b5-1(c)(1)(ii)(D)(3) under the Exchange Act) to satisfy tax withholding obligations arising exclusively from the vesting of equity awards and the related issuance of up to 13,620 shares of the Company’s common stock. The number of shares that will be sold to satisfy applicable tax withholding obligations upon vesting is not currently determinable as the number will vary based on the market price of the Company’s common stock and the extent to which vesting conditions are satisfied. The Trading Arrangement will terminate December 4, 2026, subject to early termination for certain specified events set forth in the Trading Arrangement.