OKLO

SEC source: 0001104659-24-060615 · tm2414121-11_4seq1.xml · nonDerivative · entry 2

DeWitte Jacob · CIK 0002021433 · Director · Co-Founder, CEO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · By Caroline Cochran

Disclosed balance after: 10,911,600

F1 · kind: Represents securities received as part of the Issuer's business combination, in connection with that certain Agreement and Plan of Merger and Reorganization, dated as of July 11, 2023 (the "Merger Agreement"), by and between the Issuer (formerly AltC Acquisition Corp.), AltC Merger Sub, Inc., and Oklo Inc. ("Legacy Oklo") pursuant to which shares of common stock of Legacy Oklo automatically converted into the right to receive (i) cash and Class A Common Stock of the Issuer and (ii) the right to receive Earnout Shares (as defined below).

F1 · price: Represents securities received as part of the Issuer's business combination, in connection with that certain Agreement and Plan of Merger and Reorganization, dated as of July 11, 2023 (the "Merger Agreement"), by and between the Issuer (formerly AltC Acquisition Corp.), AltC Merger Sub, Inc., and Oklo Inc. ("Legacy Oklo") pursuant to which shares of common stock of Legacy Oklo automatically converted into the right to receive (i) cash and Class A Common Stock of the Issuer and (ii) the right to receive Earnout Shares (as defined below).

F2 · ownership.nature: Represents securities held by the Reporting Person's spouse.

SEC source: 0001104659-24-060615 · tm2414121-11_4seq1.xml · nonDerivative · entry 1

DeWitte Jacob · CIK 0002021433 · Director · Co-Founder, CEO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,190,452

F1 · kind: Represents securities received as part of the Issuer's business combination, in connection with that certain Agreement and Plan of Merger and Reorganization, dated as of July 11, 2023 (the "Merger Agreement"), by and between the Issuer (formerly AltC Acquisition Corp.), AltC Merger Sub, Inc., and Oklo Inc. ("Legacy Oklo") pursuant to which shares of common stock of Legacy Oklo automatically converted into the right to receive (i) cash and Class A Common Stock of the Issuer and (ii) the right to receive Earnout Shares (as defined below).

F1 · price: Represents securities received as part of the Issuer's business combination, in connection with that certain Agreement and Plan of Merger and Reorganization, dated as of July 11, 2023 (the "Merger Agreement"), by and between the Issuer (formerly AltC Acquisition Corp.), AltC Merger Sub, Inc., and Oklo Inc. ("Legacy Oklo") pursuant to which shares of common stock of Legacy Oklo automatically converted into the right to receive (i) cash and Class A Common Stock of the Issuer and (ii) the right to receive Earnout Shares (as defined below).

SEC source: 0001104659-24-060609 · tm2414121-9_4seq1.xml · derivative · entry 1

Bealmear Richard Craig · CIK 0001855623 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,325,759

Underlying: Class A Common Stock · 1,325,759 shares

Expires 2033-08-01

F1 · kind: Represents securities received as part of the Issuer's business combination, in connection with that certain Agreement and Plan of Merger and Reorganization, dated as of July 11, 2023 (the "Merger Agreement"), by and between the Issuer (formerly AltC Acquisition Corp.), AltC Merger Sub, Inc., and Oklo Inc. ("Legacy Oklo") pursuant to which each Legacy Oklo stock option was automatically converted into the right to receive stock options of the Issuer with the same terms and conditions.

F1 · price: Represents securities received as part of the Issuer's business combination, in connection with that certain Agreement and Plan of Merger and Reorganization, dated as of July 11, 2023 (the "Merger Agreement"), by and between the Issuer (formerly AltC Acquisition Corp.), AltC Merger Sub, Inc., and Oklo Inc. ("Legacy Oklo") pursuant to which each Legacy Oklo stock option was automatically converted into the right to receive stock options of the Issuer with the same terms and conditions.

F2 · derivative.exercise_date: The stock option vests as to 20% of the underlying shares on August 1, 2024 and thereafter in 48 substantially equal monthly installments.

SEC source: 0001104659-24-060612 · tm2414002-1_4seq1.xml · derivative · entry 2

Klein Michael Stuart · CIK 0001327392 · Director · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · 10% owner

AltC Sponsor LLC · CIK 0001849019 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Class A Common Stock, par value $0.0001 per share · 12,500,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · price: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · derivative.exercise_date: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · derivative.expiration_date: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F1 · ownership.nature: This Form 4 is filed by the following Reporting Persons: Michael Stuart Klein, M. Klein Associates, Inc., and AltC Sponsor LLC (the "Sponsor"). Because of the relationships among the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of their respective pecuniary interests.

F3 · ownership.nature: The reported shares of the Issuer are directly held by the Sponsor. Michael Klein is the controlling stockholder of M. Klein Associates, Inc., which is the managing member of the Sponsor. The filing of this statement shall not be deemed to be an admission that, for purposes of Section 16 under the Securities Exchange Act of 1934, as amended, or otherwise, any of the Reporting Persons is the beneficial owner of any securities reported herein. The Reporting Persons disclaim beneficial ownership of any securities of the Issuer except to the extent of such Reporting Person's pecuniary interest therein.

SEC source: 0001104659-24-060612 · tm2414002-1_4seq1.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · 10% owner

AltC Sponsor LLC · CIK 0001849019 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 13,935,500

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · price: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F1 · ownership.nature: This Form 4 is filed by the following Reporting Persons: Michael Stuart Klein, M. Klein Associates, Inc., and AltC Sponsor LLC (the "Sponsor"). Because of the relationships among the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of their respective pecuniary interests.

F3 · ownership.nature: The reported shares of the Issuer are directly held by the Sponsor. Michael Klein is the controlling stockholder of M. Klein Associates, Inc., which is the managing member of the Sponsor. The filing of this statement shall not be deemed to be an admission that, for purposes of Section 16 under the Securities Exchange Act of 1934, as amended, or otherwise, any of the Reporting Persons is the beneficial owner of any securities reported herein. The Reporting Persons disclaim beneficial ownership of any securities of the Issuer except to the extent of such Reporting Person's pecuniary interest therein.

SEC source: 0001104659-24-060608 · tm2414121-8_4seq1.xml · derivative · entry 2

Altman Samuel H. · CIK 0001571705 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Hydrazine Capital II, L.P.

Disclosed balance after: 581,131

Underlying: Class A Common Stock · 581,131 shares

Expires not disclosed

F3 · derivative.exercise_price: Each earnout right represents a contingent right to receive one share of the Issuer's Class A Common Stock (each, an "Earnout Share") upon the satisfaction of certain price thresholds. Pursuant to an "earnout" provision in the Merger Agreement, the Earnout Shares may be issued in three separate tranches based upon (A) the closing sale price of one share of the Issuer's Class A Common Stock for any twenty trading days within any sixty consecutive trading day period within the five-year period following the closing of the Issuer's business combination or (B) if the Issuer undergoes a Change in Control (as defined in the Merger Agreement), the price per share received by stockholders of the Issuer in such Change in Control transaction.

F1 · kind: Represents securities received as part of the Issuer's business combination, in connection with that certain Agreement and Plan of Merger and Reorganization, dated as of July 11, 2023 (the "Merger Agreement"), by and between the Issuer (formerly AltC Acquisition Corp.), AltC Merger Sub, Inc., and Oklo Inc. ("Legacy Oklo") pursuant to which shares of common stock of Legacy Oklo automatically converted into the right to receive (i) cash and Class A Common Stock of the Issuer and (ii) the right to receive Earnout Shares (as defined below).

F1 · price: Represents securities received as part of the Issuer's business combination, in connection with that certain Agreement and Plan of Merger and Reorganization, dated as of July 11, 2023 (the "Merger Agreement"), by and between the Issuer (formerly AltC Acquisition Corp.), AltC Merger Sub, Inc., and Oklo Inc. ("Legacy Oklo") pursuant to which shares of common stock of Legacy Oklo automatically converted into the right to receive (i) cash and Class A Common Stock of the Issuer and (ii) the right to receive Earnout Shares (as defined below).

F3 · derivative.exercise_date: Each earnout right represents a contingent right to receive one share of the Issuer's Class A Common Stock (each, an "Earnout Share") upon the satisfaction of certain price thresholds. Pursuant to an "earnout" provision in the Merger Agreement, the Earnout Shares may be issued in three separate tranches based upon (A) the closing sale price of one share of the Issuer's Class A Common Stock for any twenty trading days within any sixty consecutive trading day period within the five-year period following the closing of the Issuer's business combination or (B) if the Issuer undergoes a Change in Control (as defined in the Merger Agreement), the price per share received by stockholders of the Issuer in such Change in Control transaction.

F3 · derivative.expiration_date: Each earnout right represents a contingent right to receive one share of the Issuer's Class A Common Stock (each, an "Earnout Share") upon the satisfaction of certain price thresholds. Pursuant to an "earnout" provision in the Merger Agreement, the Earnout Shares may be issued in three separate tranches based upon (A) the closing sale price of one share of the Issuer's Class A Common Stock for any twenty trading days within any sixty consecutive trading day period within the five-year period following the closing of the Issuer's business combination or (B) if the Issuer undergoes a Change in Control (as defined in the Merger Agreement), the price per share received by stockholders of the Issuer in such Change in Control transaction.

F2 · ownership.nature: The Reporting Person has sole voting and investment power over the shares held by Hydrazine Capital II, L.P. and therefore may be deemed to share beneficial ownership over such shares.

SEC source: 0001104659-24-060608 · tm2414121-8_4seq1.xml · nonDerivative · entry 1

Altman Samuel H. · CIK 0001571705 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Hydrazine Capital II, L.P.

Disclosed balance after: 3,151,379

F1 · kind: Represents securities received as part of the Issuer's business combination, in connection with that certain Agreement and Plan of Merger and Reorganization, dated as of July 11, 2023 (the "Merger Agreement"), by and between the Issuer (formerly AltC Acquisition Corp.), AltC Merger Sub, Inc., and Oklo Inc. ("Legacy Oklo") pursuant to which shares of common stock of Legacy Oklo automatically converted into the right to receive (i) cash and Class A Common Stock of the Issuer and (ii) the right to receive Earnout Shares (as defined below).

F1 · price: Represents securities received as part of the Issuer's business combination, in connection with that certain Agreement and Plan of Merger and Reorganization, dated as of July 11, 2023 (the "Merger Agreement"), by and between the Issuer (formerly AltC Acquisition Corp.), AltC Merger Sub, Inc., and Oklo Inc. ("Legacy Oklo") pursuant to which shares of common stock of Legacy Oklo automatically converted into the right to receive (i) cash and Class A Common Stock of the Issuer and (ii) the right to receive Earnout Shares (as defined below).

F2 · ownership.nature: The Reporting Person has sole voting and investment power over the shares held by Hydrazine Capital II, L.P. and therefore may be deemed to share beneficial ownership over such shares.

SEC source: 0001104659-24-077386 · tm2417538-2_4aseq1.xml · derivative · entry 2

Klein Michael Stuart · CIK 0001327392 · Director · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · 10% owner

AltC Sponsor LLC · CIK 0001849019 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Class A Common Stock, par value $0.0001 per share · 12,500,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · price: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · derivative.exercise_date: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · derivative.expiration_date: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F1 · ownership.nature: This Form 4 is filed by the following Reporting Persons: Michael Stuart Klein, M. Klein Associates, Inc., and AltC Sponsor LLC (the "Sponsor"). Because of the relationships among the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of their respective pecuniary interests.

F3 · ownership.nature: The reported shares of the Issuer are directly held by the Sponsor. Michael Klein is the controlling stockholder of M. Klein Associates, Inc., which is the managing member of the Sponsor. The filing of this statement shall not be deemed to be an admission that, for purposes of Section 16 under the Securities Exchange Act of 1934, as amended, or otherwise, any of the Reporting Persons is the beneficial owner of any securities reported herein. The Reporting Persons disclaim beneficial ownership of any securities of the Issuer except to the extent of such Reporting Person's pecuniary interest therein.

SEC source: 0001104659-24-077386 · tm2417538-2_4aseq1.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · 10% owner

AltC Sponsor LLC · CIK 0001849019 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 13,950,000

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · price: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F1 · ownership.nature: This Form 4 is filed by the following Reporting Persons: Michael Stuart Klein, M. Klein Associates, Inc., and AltC Sponsor LLC (the "Sponsor"). Because of the relationships among the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of their respective pecuniary interests.

F3 · ownership.nature: The reported shares of the Issuer are directly held by the Sponsor. Michael Klein is the controlling stockholder of M. Klein Associates, Inc., which is the managing member of the Sponsor. The filing of this statement shall not be deemed to be an admission that, for purposes of Section 16 under the Securities Exchange Act of 1934, as amended, or otherwise, any of the Reporting Persons is the beneficial owner of any securities reported herein. The Reporting Persons disclaim beneficial ownership of any securities of the Issuer except to the extent of such Reporting Person's pecuniary interest therein.

SEC source: 0001104659-21-092204 · tm2122217-1_4seq1.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director · Chairman · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · Chairman · 10% owner

AltC Sponsor LLC · CIK 0001849019 · Director · Chairman · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,435,500

F1 · ownership.nature: The reported shares of AltC Acquisition Corp. (the "Issuer") are directly held by AltC Sponsor LLC (the "Sponsor"). Michael Klein is the controlling stockholder of M. Klein Associates, Inc. which is the managing member of the Sponsor.

F2 · ownership.nature: On July 12, 2021 in connection with the Issuer's initial public offering, the Sponsor purchased from the Issuer 1,450,000 shares of Class A common stock, par value $0.0001, at a purchase price of $10.00 per share.

SEC source: 0001104659-24-077384 · tm2417538-1_4aseq1.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director · Chairman · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · Chairman · 10% owner

AltC Sponsor LLC · CIK 0001849019 · Director · Chairman · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,450,000

F1 · ownership.nature: The reported shares of AltC Acquisition Corp. (the "Issuer") are directly held by AltC Sponsor LLC (the "Sponsor"). Michael Klein is the controlling stockholder of M. Klein Associates, Inc. which is the managing member of the Sponsor.

F2 · ownership.nature: On July 12, 2021 in connection with the Issuer's initial public offering, the Sponsor purchased from the Issuer 1,450,000 shares of Class A common stock, par value $0.0001, at a purchase price of $10.00 per share.