Renner Alexandra (Last) (First) (Middle) C/O OKLO INC. 3190 CORONADO DRIVE (Street) SANTA CLARA CALIFORNIA 95054 (City) (State) (Zip) UNITED STATES (Country) 2. Date of Event Requiring Statement (Month/Day/Year) 07/27/2026 3. Issuer Name and Ticker or Trading Symbol Oklo Inc. [ OKLO ] 3a. Foreign Trading Symbol 5. If Amendment, Date of Original Filed (Month/Day/Year) 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner X Officer (give title below) Other (specify below) Chief Product Officer 6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person Table I - Non-Derivative Securities Beneficially Owned 1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Class A Common Stock 472,135 D Class A Common Stock 123,153 I Joint account with spouse Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Option (1) 12/22/2033 Class A Common Stock 136,393 $ 3.18 D Restricted Stock Units (2) (2) Class A Common Stock 3,633 (3) D Restricted Stock Units (4) (4) Class A Common Stock 52,174 (3) D Restricted Stock Units (5) (5) Class A Common Stock 17,489 (3) D Restricted Stock Units (6) (6) Class A Common Stock 5,502 (3) D Restricted Stock Units (7) (7) Class A Common Stock 4,070 (3) D Restricted Stock Units (8) (8) Class A Common Stock 2,471 (3) D Restricted Stock Units (9) (9) Class A Common Stock 52,860 (3) D Restricted Stock Units (10) (10) Class A Common Stock 1,652 (3) D Explanation of Responses: 1. 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. 2. The restricted stock units vest in three substantially equal annual installments beginning on March 31, 2027. 3. Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock. 4. The restricted stock units vest in 12 substantially equal quarterly installments beginning on August 27, 2026. 5. The restricted stock units vest in twelve substantially equal quarterly installments, which began on July 13, 2026. 6. The restricted stock units vest in full on March 8, 2027. 7. The restricted stock units vest in three substantially equal annual installments, which began on March 6, 2026. 8. The restricted stock units vest in full on September 26, 2026. 9. 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. 10. The restricted stock units vest in three substantially equal annual installments, which began on November 29, 2025. Remarks: /s/ Richard Craig Bealmear, Attorney-in-Fact 08/04/2026 ** Signature of Reporting Person Date Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. * If the form is filed by more than one reporting person, see Instruction 5 (b)(v). ** Intentional misstatements or omissions of fac filed an initial statement of beneficial ownership (Form 3) as a Director of OKLO, with an event date of 5. The filer directly owns 472,135 shares of common stock. This is a routine insider-ownership disclosure with no indication of open-market purchases or activist intent.