SCHEDULE 13G/A 0001104659-22-020688 0001849019 XXXXXXXX LIVE 1 Class A Common Stock, par value $0.0001 per share 12/31/2024 0001849056 Oklo Inc. 02156V109 3190 Coronado Dr. Santa Clara CA 95054 Rule 13d-1(d) AltC Sponsor LLC DE 0.00 0.00 0.00 0.00 0.00 N 0 OO M. Klein Associates, Inc. NY 0.00 500000.00 0.00 500000.00 500000.00 N 0.41 CO Michael Klein X1 0.00 500000.00 0.00 500000.00 500000.00 N 0.41 IN Oklo Inc. 3190 Coronado Dr., Santa Clara, CA 95054 This statement is filed on behalf of each of the following persons (collectively, the "Reporting Persons"): 1. AltC Sponsor LLC 2. M. Klein Associates, Inc. 3. Michael Klein This Schedule 13G/A is being filed as an amendment ("Amendment No. 1") to the statement on Schedule 13G filed with the Securities and Exchange Commission ("SEC") on behalf of AltC Sponsor LLC (the "Sponsor"), M. Klein Associates, Inc. ("M. Klein") and Michael Klein (together with the Sponsor and M. Klein, the "Reporting Persons"), with respect to the Class A common stock ("Common Stock") of Oklo Inc. (the "Issuer") on February 11, 2022 (the "Schedule 13G"), pursuant to Rule 13d-2 of the Securities Exchange Act of 1934, as amended, to amend and supplement certain information set forth below in the items indicated. All capitalized terms used in this Amendment No. 1 and not otherwise defined herein have the meanings ascribed to such terms in the Schedule 13G. The Reporting Persons are filing this Amendment No. 1 to report (i) the distribution of shares of Common Stock by the Sponsor on a pro rata basis to its members or their permitted transferees, including to M. Klein, and (ii) that the Reporting Persons ceased to beneficially own more than five percent of the class of Common Stock. The principal business address of each of the Reporting Persons is as follows: 640 Fifth Avenue, 14th Floor New York, NY 10019 See responses to Item 4 on each cover page. Y See responses to Item 9 on each cover page. The responses to Items 5-11 of the cover pages of this Schedule 13G/A are incorporated herein by reference. On November 14, 2024, the Sponsor consummated a pro rata distribution of its shares of Common Stock to its members (the "Sponsor Distribution"). After the Sponsor Distribution, 212,900 shares of Common Stock are held of record by M. Klein Associates, Inc. and 287,100 shares of Common Stock are held of record by Allies Capital Corp. Michael Klein is the controlling stockholder of M. Klein Associates, Inc., which is the managing member of the Sponsor. Michael Klein is the sole stockholder of Allies Capital Corp. Percentage ownership is based on 122,096,270 shares of Common Stock outstanding as of November 14, 2024, as reported by the Issuer in its Quarterly Report on Form 10-Q filed on November 14, 2024. See responses to Item 11 on each cover page. See responses to Item 5 on each cover page. See responses to Item 6 on each cover page. See responses to Item 7 on each cover page. See responses to Item 8 on each cover page. N Y Y Y Y Y Y AltC Sponsor LLC /s/ Jay Taragin 02/14/2025 M. Klein Associates, Inc. /s/ Jay Taragin 02/14/2025 Michael Klein /s/ Michael Klein 02/14/2025