X0508 4 2026-01-09 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 true Class A Common Stock 2026-01-09 4 S false 26741 111.38 D 799023 D Class A Common Stock 2026-01-09 4 S false 12977 112.32 D 1396096 I By Caroline Cochran GRAT Class A Common Stock 2026-01-09 4 S false 6096 112.83 D 1390000 I By Caroline Cochran GRAT 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 2026-01-09 4 S false 26740 111.38 D 808197 I By Jacob DeWitte Class A Common Stock 2026-01-09 4 S false 12977 112.32 D 1396097 I By Jacob DeWitte GRAT Class A Common Stock 2026-01-09 4 S false 6097 112.83 D 1390000 I By Jacob DeWitte GRAT Class A Common Stock 7851901 I By the Jacob DeWitte Family Trust Class A Common Stock 1000000 I By Jacob DeWitte GRAT No. 2 The sales reported herein were effected pursuant to a Rule 10b5-1 plan adopted on March 31, 2025. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $111.00 - $111.62, 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 within the range set forth herein. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $111.62 - $112.55, 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 within the range set forth herein. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $112.70 - $113.58, 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 within the range set forth herein. Represents securities held by the Reporting Person's spouse. Represents securities beneficially owned by the Reporting Person's spouse. /s/ Richard Craig Bealmear, Attorney-in-Fact 2026-01-13