Oklo

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-09-26 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: Oklo Inc. (OKLO) CIK: 0001849056 --- Reporting Owner --- Name: Goodwin William Carroll Murphy CIK: 0002080717 Role: Officer (Chief Strategy Officer) --- Non-Derivative Transactions --- [Transaction #1] Security: Class A Common Stock Date: 2026-09-26 | Code: M (Exercise of derivative) Shares: +3,294 Shares Owned After: 48,562 | Ownership: D (Direct) Footnotes: [F1] Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's Class A Common Stock. [Transaction #2] Security: Class A Common Stock Date: 2026-09-28 | Code: S (Open market sale) Shares: -1,775 | Price: $37.39 Total Value: $66,367.25 Shares Owned After: 46,787 | Ownership: D (Direct) Footnotes: [F2] Represents the number of shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of the RSUs. The sale was to satisfy tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary transaction by the Reporting Person. --- Derivative Transactions --- [Transaction #1] Security: Restricted Stock Units Date: 2026-09-26 | Code: M (Exercise of derivative) Shares: -3,294 | Price: $0.00 Shares Owned After: 94,593 | Ownership: D (Direct) Footnotes: [F1] Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's Class A Common Stock. [F3] On November 4, 2025, the Reporting Person was granted 3,294 RSUs. On September 26, 2026, the RSUs vested in full. [F3] On November 4, 2025, the Reporting Person was granted 3,294 RSUs. On September 26, 2026, the RSUs vested in full. --- Footnotes (Complete Index) --- F1: Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's Class A Common Stock. F2: Represents the number of shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of the RSUs. The sale was to satisfy tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary transaction by the Reporting Person. F3: On November 4, 2025, the Reporting Person was granted 3,294 RSUs. On September 26, 2026, the RSUs vested in full. --- Signature --- /s/ /s/ Richard Craig Bealmear, Attorney-in-Fact (2026-09-29)