X0508 4 2025-12-22 0001849056 Oklo Inc. OKLO 0002021433 DeWitte Jacob C/O OKLO INC. 3190 CORONADO DR. SANTA CLARA CA 95054 true true true false Co-Founder, CEO true Class A Common Stock 9780098 D Class A Common Stock 9502108 I By Caroline Cochran Class A Common Stock 2025-12-22 4 S false 30635 80.8378 D 1969365 I By Jacob DeWitte GRAT Class A Common Stock 2025-12-22 4 S false 142695 81.6720 D 1826670 I By Jacob DeWitte GRAT Class A Common Stock 2025-12-22 4 S false 191284 82.6108 D 1635386 I By Jacob DeWitte GRAT Class A Common Stock 2025-12-22 4 S false 42653 83.5580 D 1592733 I By Jacob DeWitte GRAT Class A Common Stock 2025-12-22 4 S false 11090 84.5529 D 1581643 I By Jacob DeWitte GRAT Class A Common Stock 2025-12-22 4 S false 1643 85.7025 D 1580000 I By Jacob DeWitte GRAT Class A Common Stock 2025-12-22 4 S false 30634 80.8378 D 1969366 I By Caroline Cochran GRAT Class A Common Stock 2025-12-22 4 S false 142696 81.6720 D 1826670 I By Caroline Cochran GRAT Class A Common Stock 2025-12-22 4 S false 191284 82.6108 D 1635386 I By Caroline Cochran GRAT Class A Common Stock 2025-12-22 4 S false 42653 83.5580 D 1592733 I By Caroline Cochran GRAT Class A Common Stock 2025-12-22 4 S false 11089 84.5529 D 1581644 I By Caroline Cochran GRAT Class A Common Stock 2025-12-22 4 S false 1644 85.7025 D 1580000 I By Caroline Cochran GRAT Represents securities held by the Reporting Person's spouse. 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 $80.16 to $81.16, 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 $81.17 to $82.17, 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 $82.18 to $83.18, 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 $83.19 to $84.19, 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 $84.20 to $85.20, 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 $85.21 to $85.73, 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. /s/ Richard Craig Bealmear, Attorney-in-Fact 2025-12-23