X0508 4 2025-12-24 false 0001849056 Oklo Inc. OKLO 0002021786 Cochran Caroline C/O OKLO INC. 3190 CORONADO DR. SANTA CLARA CA 95054 true true true false Co-Founder, COO false Class A Common Stock 2025-12-24 4 G false 7583085 0 D 919023 D Class A Common Stock 7583085 I By the Caroline DeWitte Family Trust Class A Common Stock 1000000 I By Caroline DeWitte GRAT No. 2 Class A Common Stock 1580000 I By Caroline Cochran GRAT Class A Common Stock 1580000 I By Jacob DeWitte GRAT Class A Common Stock 2025-12-24 4 G false 7851901 0 D 928197 I By Jacob DeWitte Class A Common Stock 7851901 I By the Jacob DeWitte Family Trust Class A Common Stock 1000000 I By Jacob DeWitte GRAT No. 2 Excludes 1,000,000 shares previously owned directly which were contributed to a grantor retained annuity trust on December 24, 2025. On December 24, 2025, the Reporting Person transferred 7,583,085 shares to the Caroline DeWitte Family Trust for no consideration. The Reporting Person is trustee of the trust. The Reporting Person, members of her family and certain charitable organizations are the beneficiaries of the trust. The Reporting Person remains the beneficial owner of the securities held by the trust. These shares were previously reported as directly beneficially owned but were contributed to a grantor retained annuity trust on December 24, 2025. Represents securities beneficially owned by the Reporting Person's spouse. Excludes 1,000,000 shares previously owned by the Reporting Person's spouse which were contributed to a grantor retained annuity trust on December 24, 2025. On December 24, 2025, spouse of the Reporting Person transferred 7,851,901 shares to the Jacob DeWitte Family Trust for no consideration. Spouse of the Reporting Person is trustee of the trust. Spouse of the Reporting Person, members of his family and certain charitable organizations are the beneficiaries of the trust. Spouse of the Reporting Person remains the beneficial owner of the securities held by the trust. Represents securities held by the Reporting Person's spouse. These shares were previously reported as beneficially owned by the Reporting Person's spouse but were contributed to a grantor retained annuity trust on December 24, 2025. /s/ Richard Craig Bealmear, Attorney-in-Fact 2025-12-29