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 September 30, 2026.

On August 11, 2026, R. Craig Bealmear, the Company's Chief Financial Officer, adopted a Rule 10b5-1 trading arrangement providing for the exercise of stock options for an aggregate of 233,714 shares of the Company's common stock and "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 exercise of such options. The transactions are scheduled to begin on February 1, 2027, with outstanding orders expiring on December 10, 2027 and the arrangement terminating no later than December 13, 2027, subject to early termination in accordance with its terms.

On September 29, 2026, trusts associated with Jacob DeWitte, the Company's Chief Executive Officer and a director, and Caroline DeWitte, the Company's Chief Operating Officer and a director, adopted a Rule 10b5-1 trading arrangement. The arrangement provides for the sale of an aggregate of up to 2,500,000 shares of the Company's common stock, consisting of 1,250,000 shares allocated to the Jacob DeWitte Family Trust and Jacob DeWitte Grantor Retained Annuity Trust No. 1 and 1,250,000 shares allocated to the Caroline DeWitte Family Trust and Caroline DeWitte Grantor Retained Annuity Trust No. 1. Sales are scheduled to begin on January 12, 2027, subject to certain commencement conditions, and continue through December 31, 2027, subject to earlier termination in accordance with its terms.