Oklo

=== SEC Form 3 — Statement of Changes in Beneficial Ownership === Document Type: 3 Period of Report: 2026-07-27 --- Issuer --- Name: Oklo Inc. (OKLO) CIK: 0001849056 --- Reporting Owner --- Name: Renner Alexandra CIK: 0002147680 Role: Officer (Chief Product Officer) --- Holdings --- [Holding #1] Security: Class A Common Stock Ownership: D (Direct) [Holding #2] Security: Class A Common Stock Ownership: I (Indirect) [Holding #3] Security: Stock Option Ownership: D (Direct) Footnotes: [F1] The stock option vested as to 20% of the underlying shares on December 1, 2024 and continues to vest thereafter in 48 substantially equal monthly installments. On August 1, 2026, 4,546 stock options vested. [Holding #4] Security: Restricted Stock Units Ownership: D (Direct) Footnotes: [F3] Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock. [F2] The restricted stock units vest in three substantially equal annual installments beginning on March 31, 2027. [F2] The restricted stock units vest in three substantially equal annual installments beginning on March 31, 2027. [Holding #5] Security: Restricted Stock Units Ownership: D (Direct) Footnotes: [F3] Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock. [F4] The restricted stock units vest in 12 substantially equal quarterly installments beginning on August 27, 2026. [F4] The restricted stock units vest in 12 substantially equal quarterly installments beginning on August 27, 2026. [Holding #6] Security: Restricted Stock Units Ownership: D (Direct) Footnotes: [F3] Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock. [F5] The restricted stock units vest in twelve substantially equal quarterly installments, which began on July 13, 2026. [F5] The restricted stock units vest in twelve substantially equal quarterly installments, which began on July 13, 2026. [Holding #7] Security: Restricted Stock Units Ownership: D (Direct) Footnotes: [F3] Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock. [F6] The restricted stock units vest in full on March 8, 2027. [F6] The restricted stock units vest in full on March 8, 2027. [Holding #8] Security: Restricted Stock Units Ownership: D (Direct) Footnotes: [F3] Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock. [F7] The restricted stock units vest in three substantially equal annual installments, which began on March 6, 2026. [F7] The restricted stock units vest in three substantially equal annual installments, which began on March 6, 2026. [Holding #9] Security: Restricted Stock Units Ownership: D (Direct) Footnotes: [F3] Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock. [F8] The restricted stock units vest in full on September 26, 2026. [F8] The restricted stock units vest in full on September 26, 2026. [Holding #10] Security: Restricted Stock Units Ownership: D (Direct) Footnotes: [F3] Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock. [F9] The restricted stock units vested as to 20% of the underlying shares on March 13, 2026 and continue to vest thereafter in 48 substantially equal monthly installments. [F9] The restricted stock units vested as to 20% of the underlying shares on March 13, 2026 and continue to vest thereafter in 48 substantially equal monthly installments. [Holding #11] Security: Restricted Stock Units Ownership: D (Direct) Footnotes: [F3] Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock. [F10] The restricted stock units vest in three substantially equal annual installments, which began on November 29, 2025. [F10] The restricted stock units vest in three substantially equal annual installments, which began on November 29, 2025. --- Footnotes (Complete Index) --- F1: The stock option vested as to 20% of the underlying shares on December 1, 2024 and continues to vest thereafter in 48 substantially equal monthly installments. On August 1, 2026, 4,546 stock options vested. F10: The restricted stock units vest in three substantially equal annual installments, which began on November 29, 2025. F2: The restricted stock units vest in three substantially equal annual installments beginning on March 31, 2027. F3: Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock. F4: The restricted stock units vest in 12 substantially equal quarterly installments beginning on August 27, 2026. F5: The restricted stock units vest in twelve substantially equal quarterly installments, which began on July 13, 2026. F6: The restricted stock units vest in full on March 8, 2027. F7: The restricted stock units vest in three substantially equal annual installments, which began on March 6, 2026. F8: The restricted stock units vest in full on September 26, 2026. F9: The restricted stock units vested as to 20% of the underlying shares on March 13, 2026 and continue to vest thereafter in 48 substantially equal monthly installments. --- Signature --- /s/ /s/ Richard Craig Bealmear, Attorney-in-Fact (2026-08-04)