Oklo

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-09-13 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: Oklo Inc. (OKLO) CIK: 0001849056 --- Reporting Owner --- Name: Hanson John CIK: 0002146828 Role: Officer (Chief of Staff) --- Non-Derivative Transactions --- [Transaction #1] Security: Class A Common Stock Date: 2026-09-13 | Code: M (Exercise of derivative) Shares: +961 Shares Owned After: 360,391 | 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. --- Derivative Transactions --- [Transaction #1] Security: Restricted Stock Units Date: 2026-09-13 | Code: M (Exercise of derivative) Shares: -961 | Price: $0.00 Shares Owned After: 55,121 | 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. [F2] On March 13, 2025 the Reporting Person was granted 57,665 RSUs, vesting as to 20% of the underlying shares on March 13, 2026 and continuing to vest thereafter in 48 substantially equal quarterly installments. On September 13, 2026, 961 RSUs were distributed. [F2] On March 13, 2025 the Reporting Person was granted 57,665 RSUs, vesting as to 20% of the underlying shares on March 13, 2026 and continuing to vest thereafter in 48 substantially equal quarterly installments. On September 13, 2026, 961 RSUs were distributed. --- 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: On March 13, 2025 the Reporting Person was granted 57,665 RSUs, vesting as to 20% of the underlying shares on March 13, 2026 and continuing to vest thereafter in 48 substantially equal quarterly installments. On September 13, 2026, 961 RSUs were distributed. --- Signature --- /s/ /s/ Richard Craig Bealmear, Attorney-in-Fact (2026-09-15)