Investor Relations

This communication does not constitute a solicitation of any vote or approval. In connection with the proposed business combination, Dune Acquisition Corp., a Delaware corporation ("Dune") will file with the Securities and Exchange Commission (the "SEC") a proxy statement. Dune also plans to file other documents with the SEC regarding the proposed transaction. After the proxy statement has been cleared by the SEC, a definitive proxy statement will be mailed to the shareholders of Dune. SHAREHOLDERS OF DUNE ARE URGED TO READ THE PROXY STATEMENT (INCLUDING ALL AMENDMENTS AND SUPPLEMENTS THERETO) AND OTHER DOCUMENTS RELATING TO THE PROPOSED BUSINESS COMBINATION 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. Shareholders will be able to obtain free copies of the proxy statement and other documents containing important information about Dune and Assetpromarketing Holding Corp., a Delaware corporation, and its affiliates ("Assetpromarketing") once such documents are filed with the SEC, through the website maintained by the SEC at http://www.sec.gov

Dune and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the shareholders of Dune in connection with the proposed transaction. Information about the directors and executive officers of Dune is set forth in Dune's final prospectus dated December 17, 2020 and filed with the SEC on December 21, 2020. Other information regarding the participants in the proxy solicitation and a description of their direct and indirect interests, by security holdings or otherwise, will be contained in the proxy statement and other relevant materials to be filed with the SEC when they become available.

This communication does not constitute a solicitation of any vote or approval. In connection with the proposed business combination, Dune Acquisition Corp., a Delaware corporation ("Dune") will file with the Securities and Exchange Commission (the "SEC") a proxy statement. Dune also plans to file other documents with the SEC regarding the proposed transaction. After the proxy statement has been cleared by the SEC, a definitive proxy statement will be mailed to the shareholders of Dune. SHAREHOLDERS OF DUNE ARE URGED TO READ THE PROXY STATEMENT (INCLUDING ALL AMENDMENTS AND SUPPLEMENTS THERETO) AND OTHER DOCUMENTS RELATING TO THE PROPOSED BUSINESS COMBINATION 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. Shareholders will be able to obtain free copies of the proxy statement and other documents containing important information about Dune and Assetpromarketing Holding Corp., a Delaware corporation, and its affiliates ("Assetpromarketing") once such documents are filed with the SEC, through the website maintained by the SEC at http://www.sec.gov.

In connection with the proposed business combination, Dune Acquisition Corp., a Delaware corporation ("Dune") will file a proxy statement with the Securities and Exchange Commission (the "SEC"). Additionally, Dune will file other relevant materials with the SEC in connection with the proposed business combination. The materials to be filed by Dune with the SEC may be obtained free of charge at the SEC's web site at www.sec.gov. Security holders of Dune are urged to read the proxy statement and the other relevant materials when they become available before making any voting decision with respect to the proposed business combination because they will contain important information about the business combination and the parties to the business combination. Dune and its respective directors and executive officers may be deemed to be participants in the solicitation of proxies of Dune's stockholders in connection with the proposed business combination. Security holders may obtain more detailed information regarding the names, affiliations and interests of certain of Dune's executive officers and directors in the solicitation by reading Dune's final prospectus dated December 17, 2020 and filed with the SEC on December 21, 2020, and the proxy statement and other relevant materials filed with the SEC in connection with the business combination when they become available. Information concerning the interests of Dune's participants in the solicitation, which may, in some cases, be different than those of Dune's stockholders generally, will be set forth in the proxy statement relating to the business combination when it becomes available.