ALTC Acq. 電子投票を行っている場合は、代理カードを返却しないでください。 23157 ALTC Acq。Corp.Proxy Card_REV 14-正面 あなたの投票は重要です。すぐに投票してください。 直ちに-1日24時間、週7日、または郵送投票 によるインターネット投票-迅速Easy 折り畳みここ·分離しないで·提供された封筒に インターネット- www.cstproxyvote.com インターネットを使ってあなたのエージェントに投票します。上記のサイトにアクセスする際には、代行カード が利用可能であることを確認します。提示に従ってあなたの株を投票します。 仮想会議- 仮想オンライン 特別会議に参加する予定であれば、 特別会議で電子投票を行うためには、12桁の数字 制御番号が必要です。仮想特別会議 にオンラインで参加するには、： https：//www.cstproxy.com/ altcquisitioncorp/2024にアクセスしてください。 郵送、署名、代理カードの日付を明記し、提供された郵便料金の封筒 に入れます。 あなたのインターネット投票許可で指定されたエージェント は、あなたの株に同じ方法で投票して、あなたのbr}マークをサインして代理カードにサインして返却するようにします。インターネットを通じて電子的に提出された投票は東部時間 夜11：59までに受信しなければなりません[•] 署名者はここでMichael KleinとJay Taragin(それぞれ“代表”)を代表として指定し， は米国東部時間 で開催されるALTC Acquisition Corp.株主特別総会で署名者が投票する権利のある株式(“株式”)を指定する権利があり，実際にはインターネット中継(http：//www.cstproxy.com/altcquisitioncorp/2024)またはその任意の継続および/または延期投票である.当該等の株式は、本書類の裏面に記載されている提案投票に従って、株主特別総会又はその任意の延会又は延期前に適切に提出された他の 事項において、被委代表が適宜決定しなければならない。 本委託書に代表される株式が適切に署名された場合には、以下の株主指示に署名するように 投票する。 署名と日付を明記したエージェントカードを返却しましたが、裏面のアドバイスについて具体的な指示 が与えられていない場合、このエージェントはすべての アドバイスに投票します。依頼書に署名、日付を明記して速やかに返却してください。 (引き続き裏面に日付を明記し、明記して署名) アルテカー買収会社株主特別会議依頼書。 本依頼書は取締役会を代表して募集しました

23157 ALTC Acq。Corp.Proxy Card_REV 14-Back 株主特別総会代理材料供給に関する重要な通知 は[●], 2024 This notice of meeting and the accompanying proxy statement/prospectus/consent solicitation statement are available at https://www.cstproxy.com/altcacquisitioncorp/2024 CONTROL NUMBER Signature______________________________ Signature, if held jointly__________________________________ Date_____________, 2024 When shares are held by joint tenants, both should sign. When signing as attorney, executor, administrator, trustee or guardian, please give full title as such. If a corporation, please sign in full corporate name by president or other authorized officer. If a partnership, please sign in partnership name by an authorized person. Proposal No. 1 — a proposal to (a) approve and adopt that certain Agreement and Plan of Merger and Reorganization, dated July 11, 2023 (the “Merger Agreement”), by and among AltC Acquisition Corp., a Delaware corporation (“AltC”), AltC Merger Sub, Inc., a Delaware corporation and direct wholly-owned subsidiary of AltC (“Merger Sub”), and Oklo Inc., a Delaware corporation (the “Company”), and the related agreements to which AltC is a party and (b) approve the merger of Merger Sub with and into the Company, with the Company surviving such merger as a wholly-owned subsidiary of AltC (the “Merger”), and the other transactions contemplated by the Merger Agreement and the related agreements to which AltC is a party (the “Transactions” or the “business combination” and, such proposal, the “business combination proposal”). Proposal No. 2 — a proposal to approve and adopt the proposed second amended and restated certificate of incorporation (the “second amended and restated certificate of incorporation”) of the post-closing company (the “Post-Closing Company”) in the form attached to the accompanying proxy statement/ prospectus/consent solicitation statement as Annex B (the “charter proposal”). Proposal No. 3 — a proposal to approve, on a non-binding advisory basis, certain governance provisions in the second amended and restated certificate of incorporation, presented separately in accordance with the United States Securities and Exchange Commission requirements (the “governance proposal”). Proposal No. 3A: a proposal to amend AltC’s amended and restated certificate of incorporation to restructure the capitalization of AltC such that (i) each share of Class A common stock of AltC, par value $0.0001 per share (“AltC Class A common stock”), issued and outstanding immediately prior to the date and time that the Merger becomes effective (the “Effective Time”) will remain outstanding as one (1) share of Class A common stock of the Post-Closing Company, par value $0.0001 per share (“Post-Closing Company Class A Common Stock”), and (ii) each share of Class B common stock of AltC, par value $0.0001 per share (“Class B common stock”), issued and outstanding immediately prior to the Effective Time will be reclassified on a one-for-one basis as one (1) share of Post-Closing Company Class A Common Stock. Proposal No. 3B: a proposal to amend AltC’s amended and restated certificate of incorporation to remove (i) the exclusive right of holders of Class B common stock to elect and remove directors of AltC, and instead require the approval by (x) a plurality of the votes cast by the stockholders present in person or represented by proxy and entitled to vote generally on the election of directors, to elect directors of the Post-Closing Company and (y) the affirmative vote of holders of at least a majority in voting power of the outstanding shares of capital stock of the Post-Closing Company entitled to vote generally in the election of directors, voting together as a single class, to remove directors from the Post-Closing Company; and (ii) stockholders’ ability to remove a director without cause. Proposal No. 3C: a proposal to amend AltC’s amended and restated certificate of incorporation to require the approval of the affirmative vote of holders of at least 66 2/3% in voting power of the outstanding shares of the capital stock of the Post-Closing Company entitled to vote thereon to approve changes to the Post-Closing Company’s bylaws and to amend or repeal any provisions inconsistent with certain sections of the second amended and restated certificate of incorporation. Proposal No. 3D: a proposal to amend AltC’s amended and restated certificate of incorporation to remove the requirement that a business combination or similar acquisition of the Post-Closing Company must be approved by at least 66 2/3% in voting power of the outstanding shares of capital stock of the Post-Closing Company entitled to vote thereon. Proposal No. 4 — a proposal to approve and adopt the Oklo Inc. 2024 Equity Incentive Plan (the “Incentive Plan”) in the form attached to the accompanying proxy statement/ prospectus/consent solicitation statement as Annex F, and the material terms thereof, including the authorization of the initial share reserve thereunder (the “incentive plan proposal”). Proposal No. 5 — a proposal to approve and adopt the Oklo Inc. 2024 Employee Stock Purchase Plan (the “ESPP”) in the form attached to the accompanying proxy statement/prospectus/consent solicitation statement as Annex G, and the material terms thereof, including the authorization of the initial share reserve thereunder (the “ESPP proposal”). Proposal No. 6 — a proposal to elect seven directors to serve staggered terms on the Post-Closing Company’s board of directors following the consummation of the business combination until immediately following the date of the 2025, 2026 and 2027 annual stockholder meetings, or in each case until their respective successors are duly elected and qualified, or until their earlier resignation, removal or death (the “director election proposal”). Nominee Class Lieutenant General (Ret.) John Jansen I Michael Klein I Sam Altman II Caroline Cochran II Richard W. Kinzley II Jacob DeWitte III Chris Wright III To withhold authority to vote for any individual nominee(s), mark “FOR ALL EXCEPT” and write the name(s) of the nominee(s) on the line below _________________________________________________________________ Proposal No. 7 - a proposal to approve, for purposes of complying with the applicable provisions of Section 312.03 of the New York Stock Exchange’s (the “NYSE”) Listed Company Manual, the issuance of shares of Post-Closing Company Class A Common Stock, including the approval of (a) the issuance of more than 20% of AltC’s issued and outstanding shares of common stock in connection with the business combination and (b) the issuance of shares of AltC Class A common stock (i) to one or more Related Parties (as defined in Section 312.03 of the NYSE’s Listed Company Manual) in connection with the Transactions and (ii) in connection with the acquisition of a company in which a Related Party may have a 5% or greater interest in or in the consideration to be paid in connection with such acquisition (the “NYSE proposal”). Proposal No. 8 — a proposal to adjourn the special meeting to a later date or dates, if necessary, to permit further solicitation and vote of proxies in the event that there are insufficient votes for, or otherwise in connection with, the approval of the business combination proposal, the charter proposal, the governance proposal, the incentive plan proposal, the ESPP proposal, the director election proposal or the NYSE proposal (the “adjournment proposal”). PROXY CARD THE BOARD OF DIRECTORS UNANIMOUSLY (OF THOSE WHO VOTED) RECOMMENDS A VOTE “FOR” ALL PROPOSALS. Please mark your votes like this X FOR ALL WITHHOLD ALL FOR ALL EXCEPT FOR AGAINST ABSTAIN FOR AGAINST ABSTAIN FOR AGAINST ABSTAIN FOR AGAINST ABSTAIN FOR AGAINST ABSTAIN FOR AGAINST ABSTAIN FOR AGAINST ABSTAIN FOR AGAINST ABSTAIN FOR AGAINST ABSTAIN FOR AGAINST ABSTAIN