Oklo

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-09-01 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: Oklo Inc. (OKLO) CIK: 0001849056 --- Reporting Owner --- Name: Cochran Caroline CIK: 0002021786 Role: Director, Officer (Co-Founder, COO), 10%+ Owner --- Non-Derivative Transactions --- [Transaction #1] Security: Class A Common Stock Date: 2026-09-01 | Code: S (Open market sale) Shares: -40,000 | Price: $38.66 Total Value: $1,546,400.00 Shares Owned After: 398,039 | Ownership: D (Direct) Footnotes: [F1] The sales reported herein were effected pursuant to a Rule 10b5-1 plan adopted on March 31, 2025. [F2] The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.59- $38.75 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. [F3] 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. [Transaction #2] Security: Class A Common Stock Date: 2026-09-01 | Code: S (Open market sale) Shares: -19,800 | Price: $38.88 Total Value: $769,824.00 Shares Owned After: 529,679 | Ownership: I (Indirect) | Nature: By Caroline Cochran GRAT Footnotes: [F1] The sales reported herein were effected pursuant to a Rule 10b5-1 plan adopted on March 31, 2025. [F4] The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.75- $39.08 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. [F3] 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. [Transaction #3] Security: Class A Common Stock Date: 2026-09-01 | Code: S (Open market sale) Shares: -200 | Price: $39.15 Total Value: $7,830.00 Shares Owned After: 529,479 | Ownership: I (Indirect) | Nature: By Caroline Cochran GRAT Footnotes: [F1] The sales reported herein were effected pursuant to a Rule 10b5-1 plan adopted on March 31, 2025. [F3] 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. [Transaction #4] Security: Class A Common Stock Date: 2026-09-01 | Code: S (Open market sale) Shares: -40,000 | Price: $38.40 Total Value: $1,536,000.00 Shares Owned After: 431,533 | Ownership: I (Indirect) | Nature: By Jacob DeWitte Footnotes: [F1] The sales reported herein were effected pursuant to a Rule 10b5-1 plan adopted on March 31, 2025. [F5] The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.08- $38.52 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. [F6] 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. [F7] Represents securities held by the Reporting Person's spouse. [Transaction #5] Security: Class A Common Stock Date: 2026-09-01 | Code: S (Open market sale) Shares: -20,000 | Price: $38.56 Total Value: $771,200.00 Shares Owned After: 496,483 | Ownership: I (Indirect) | Nature: By Jacob DeWitte GRAT Footnotes: [F1] The sales reported herein were effected pursuant to a Rule 10b5-1 plan adopted on March 31, 2025. [F8] The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.52- $38.59 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. [F6] 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. [F9] Represents securities beneficially owned by the Reporting Person's spouse. --- Holdings --- [Holding #1] Security: Class A Common Stock Ownership: I (Indirect) Footnotes: [F3] 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. [Holding #2] Security: Class A Common Stock Ownership: I (Indirect) Footnotes: [F3] 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. [Holding #3] Security: Class A Common Stock Ownership: I (Indirect) Footnotes: [F3] 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. [Holding #4] Security: Class A Common Stock Ownership: I (Indirect) Footnotes: [F6] 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. [F9] Represents securities beneficially owned by the Reporting Person's spouse. [Holding #5] Security: Class A Common Stock Ownership: I (Indirect) Footnotes: [F6] 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. [F9] Represents securities beneficially owned by the Reporting Person's spouse. [Holding #6] Security: Class A Common Stock Ownership: I (Indirect) Footnotes: [F6] 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. [F9] Represents securities beneficially owned by the Reporting Person's spouse. --- Footnotes (Complete Index) --- F1: The sales reported herein were effected pursuant to a Rule 10b5-1 plan adopted on March 31, 2025. F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.59- $38.75 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. F3: 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. F4: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.75- $39.08 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. F5: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.08- $38.52 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. F6: 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. F7: Represents securities held by the Reporting Person's spouse. F8: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.52- $38.59 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. F9: Represents securities beneficially owned by the Reporting Person's spouse. --- Signature --- /s/ /s/ Richard Craig Bealmear, Attorney-in-Fact (2026-09-02)