X0609 4 2026-08-03 0 0001849056 Oklo Inc. OKLO 0002021786 Cochran Caroline false C/O OKLO INC. 3190 CORONADO DR. SANTA CLARA CA 95054 1 1 1 0 Co-Founder, COO 1 Class A Common Stock 2026-08-03 4 S 0 40000 41.35 D 438039 D Class A Common Stock 2026-08-03 4 S 0 16500 38.55 D 552979 I By Caroline Cochran GRAT Class A Common Stock 2026-08-03 4 S 0 3500 39.60 D 549479 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 474011 I By Caroline DeWitt GRAT No. 3 Class A Common Stock 2026-08-03 4 S 0 40000 41.68 D 471533 I By Jacob DeWitte Class A Common Stock 2026-08-03 4 S 0 12849 40.14 D 523634 I By Jacob DeWitte GRAT Class A Common Stock 2026-08-03 4 S 0 7151 40.94 D 516483 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 Class A Common Stock 506807 I By Jacob DeWitte GRAT No.3 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 $41.06- $41.52 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. For more information about the equity of the Issuer held by the Reporting Person, please see the Issuer's most recent definitive proxy statement filed with the Securities and Exchange Commission. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.10- $39.10 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 $39.28- $39.75 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 $41.52- $42.03 inclusive. The Reporting Person's spouse 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. For more information about the equity of the Issuer held by the Reporting Person's spouse, please see the Issuer's most recent definitive proxy statement filed with the Securities and Exchange Commission. Represents securities held by the Reporting Person's spouse. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $39.75- $40.74 inclusive. The Reporting Person's spouse 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 beneficially owned by the Reporting Person's spouse. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $40.76 - $41.05 inclusive. The Reporting Person's spouse 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 2026-08-05