Benson Hill SPAC Presentation Deck

BENSON HILL Disclaimer (Cont'd) This presentation provides summary information only and is being delivered solely for informational purposes. The recipient of this presentation acknowledges that: 1. GS, Credit Suisse, Barclays, Star Peak II and Benson Hill do not provide legal, tax or accounting advice of any kind. 2. It is not relying on GS, Credit Suisse, Barclays, Star Peak II or Benson Hill for legal, tax or accounting advice, and that the recipient should receive separate and qualified legal, tax and accounting advice in connection with any transaction or course of conduct. 3. Nothing contained herein shall be deemed to be a recommendation from GS, Credit Suisse, Barclays, Star Peak II or Benson Hill to any party to enter into any transaction or to take any course of action. 4. This presentation is not intended to provide a basis for evaluating any transaction or other matter. 5. This presentation is confidential and may not be copied by, or disclosed or made available to, any person without the prior written consent of GS, Credit Suisse and Barclays. 6. None of GS, Credit Suisse, Barclays, Star Peak II or Benson Hill shall have any liability, whether direct or indirect, in contract or tort or otherwise, to any person in connection with this presentation. In connection with the Business Combination, Star Peak II intends to file with the SEC a registration statement on Form S-4 containing a preliminary proxy statement and a preliminary prospectus of Star Peak II, and after the registration statement is declared effective, Star Peak II will mail a definitive proxy statement/prospectus relating to the proposed Business Combination to its stockholders. This presentation does not contain all the information that should be considered concerning the proposed Business Combination and is not intended to form the basis of any investment decision or any other decision in respect of the Business Combination. Star Peak Il's stockholders and other interested persons are advised to read, when available, the preliminary proxy statement/prospectus and the amendments thereto and the definitive proxy statement/prospectus and other documents filed in connection with the proposed Business Combination, as these materials will contain important information about Star Peak II, Benson Hill and the Business Combination. When available, the definitive proxy statement/prospectus and other relevant materials for the proposed Business Combination will be mailed to stockholders of Star Peak II as of a record date to be established for voting on the proposed Business Combination. Stockholders will also be able to obtain copies of the preliminary proxy statement/prospectus, the definitive proxy statement/prospectus and other documents filed with the SEC, without charge, once available, at the SEC's website at www.sec.gov, or by directing a request to: Star Peak Corp II, 1603 Orrington Avenue, 13th Floor, Evanston, IL 60201. Star Peak II and its directors and executive officers may be deemed participants in the solicitation of proxies from Star Peak Il's stockholders with respect to the proposed Business Combination. A list of the names of those directors and executive officers and a description of their interests in Star Peak II is contained in Star Peak Il's final prospectus related to its initial public offering dated January 5, 2021, which was filed with the SEC and is available free of charge at the SEC's web site at www.sec.gov, or by directing a request to: Star Peak Corp II, 1603 Orrington Avenue, 13th Floor, Evanston, IL 60201. Additional information regarding the interests of such participants will be contained in the proxy statement/prospectus for the proposed Business Combination when available. Benson Hill and its directors and executive officers may also be deemed to be participants in the solicitation of proxies from the stockholders of Star Peak II in connection with the proposed Business Combination. A list of the names of such directors and executive officers and information regarding their interests in the proposed Business Combination will be included in the proxy statement for the proposed Business Combination when available. INVESTMENT IN ANY SECURITIES DESCRIBED HEREIN HAS NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND EXCHANGE COMMISSION OR ANY OTHER REGULATORY AUTHORITY NOR HAS ANY REGULATORY AUTHORITY PASSED UPON OR ENDORSED THE MERITS OF THE OFFERING OR THE ACCURACY OR ADEQUACY OF THE INFORMATION CONTAINED HEREIN. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE. THIS PRESENTATION DOES NOT CONSTITUTE AN OFFER OR SOLICITATION OF ANY SECURITIES. STAR PEAK II WILL MAKE ANY OFFER TO SELL SECURITIES ONLY PURSUANT TO A DEFINITIVE SUBSCRIPTION AGREEMENT, AND STAR PEAK II RESERVES THE RIGHT TO WITHDRAW OR AMEND FOR ANY REASON ANY OFFERING AND TO REJECT ANY SUBSCRIPTION AGREEMENT IN WHOLE OR IN PART FOR ANY REASON. 4

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