DIGITAL MANUFACTURING. REIMAGINED.

Disclaimer, cont. Industry and Market Data 然 In this presentation, Altimar II and Fathom rely on and refer to publicly available information and statistics regarding market participants in the sectors in which Fathom competes and other industry data. Any comparison of Fathom to the industry or to any of its competitors is based on this publicly available information and statistics and such comparisons assume the reliability of the information available to Altimar II and Fathom. Altimar II and Fathom obtained this information and statistics from third-party sources, including reports by market research firms and publicly available company filings. While Altimar II and Fathom believe such third-party information is reliable, there can be no assurance as to the accuracy or completeness of the referenced information. Neither Fathom nor Altimar Il has independently verified the information provided by the third-party sources. Trademarks This presentation may contain trademarks, service marks, trade names and copyrights of other companies which are the property of their respective owners. Solely for convenience, some of the trademarks, service marks, trade names and copyrights presentation may be listed without the TM, SM or Ⓡ symbols, but Altimar II and Fathom will assert, to the fullest extent under applicable law, the rights of the applicable owners, if any, to these trademarks, service marks, trade names and copyrights. Use of Projections This presentation also contains certain financial forecasts, including projected revenue. Neither Altimar II's nor Fathom's independent auditors have studied, reviewed, compiled or performed any procedures with respect to the projections for the purpose of their inclusion in this presentation, and accordingly, neither of them expressed an opinion or provided any other form of assurance with respect thereto for the purpose of this presentation. These projections are for illustrative purposes only and should not be relied upon as being necessarily indicative of future results. In this presentation, certain of the above-mentioned projected information has been provided for purposes of providing comparisons with historical data. The assumptions and estimates underlying the prospective financial information are inherently uncertain and are subject to a wide variety of significant business, economic and competitive risks and uncertainties that could cause actual results to differ materially from those contained in the prospective financial information. Projections are inherently uncertain due to a number of factors outside of Altimar II's or Fathom's control. While all financial projections, estimates and targets are necessarily speculative, Altimar II and Fathom believe that the preparation of prospective financial information involves increasingly higher levels of uncertainty the further out the projection, estimate or target extends from the date of preparation. Accordingly, there can be no assurance that the prospective results are indicative of future performance of the combined company after the Transaction or that actual results will not differ materially from those presented in the prospective financial information. Inclusion of the prospective financial information in this presentation should not be regarded as a representation by any person that the results contained in the prospective financial information will be achieved. Additional Information; Participation in Solicitation Altimar II expects to file a preliminary and definitive proxy statement, which may be included as part of a registration statement, and other relevant documents with the SEC. Altimar II stockholders and other interested persons are urged to read the proxy statement and any other relevant documents filed with the SEC when they become available because they will contain important information about Altimar II, Fathom and the proposed business combination. Stockholders will be able to obtain a free copy of the proxy statement (when filed), as well as other filings containing information about Altimar II, Fathom and the proposed business combination, without charge, at the SEC's website located at www.sec.gov. Altimar II and Fathom and their respective directors and executive officers, under SEC rules, may be deemed to be participants in the solicitation of proxies of Altimar II's shareholders in connection with the proposed business combination. Investors and security holders may obtain more detailed information regarding the names and interests in the proposed business combination of Altimar II's directors and officers in Altimar II's filings with the SEC, including Altimar II's registration statement on Form S-1 and prospectus for its initial public offering, which was originally filed with the SEC on January 20, 2021. To the extent that holdings of Altimar II's securities have changed from the amounts reported in Altimar II's registration statement on Form S-1, such changes have been or will be reflected on Statements of Change in Ownership on Form 4 filed with the SEC. Information regarding the persons who may, under SEC rules, be deemed participants in the solicitation of proxies of Altimar II's shareholders in connection with the proposed business combination will be set forth in the proxy statement/prospectus on Form S-4 for the proposed business combination, which is expected to be filed by Altimar II with the SEC. Investors and security holders of Altimar II and Fathom are urged to read the proxy statement/prospectus and other relevant documents that will be filed with the SEC carefully and in their entirety when they become available because they will contain important information about the proposed business combination. Investors and security holders will be able to obtain free copies of the proxy statement and other documents containing important information about Altimar II and Fathom through the website maintained by the SEC at www.sec.gov. Copies of the documents filed with the SEC by Altimar II can be obtained free of charge by directing a written request to Altimar II. FATHOM Fathom Proprietary and Confidential 3

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