Nautilus Biotechnology Confidential – Do Not Distribute 2 Forward-Looking StatementsThis communication contains certain “forward-looking statements” within the meaning of Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended, including statements regarding the anticipated timing and benefits of the merger (the “Transaction”) with ARYA Sciences Acquisition Corp III (“Arya III”). The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect”, “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward looking statements, but the absence of these words does not mean that a statement is not forward looking. The forward-looking statements contained herein are based on Nautilus’ current expectations and beliefs concerning future developments and their potential effects, but there can be no assurance that these will be as anticipated. These forward-looking statements involve a number of risks, uncertainties (some of which are beyond the control of Nautilus) or other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements. These factors include, among others: the inability to complete the Transaction on the expected timeline or at all; the inability to recognize the anticipated benefits of the proposed Transaction, including due to the failure to receive required security holder approvals, or the failure of other closing conditions; and costs related to the proposed Transaction. Except as required by law, Arya III and Nautilus do not undertake any obligation to update or revise any forward-looking statements whether as a result of new information, future events or otherwise. Additional InformationA full description of the terms of the transaction will be provided in a registration statement on Form S-4 to be filed with the SEC by Arya III that will include a prospectus with respect to the combined company’s securities to be issued in connection with the business combination and a proxy statement with respect to the shareholder meeting of Arya III to vote on the business combination. Arya III and Nautilus urge their investors, shareholders and other interested persons to read, when available, the preliminary proxy statement/ prospectus as well as other documents filed with the SEC because these documents will contain important information about Arya III, Nautilus Biotechnology and the transaction. After the registration statement is declared effective, the definitive proxy statement/prospectus to be included in the registration statement will be mailed to shareholders of Arya III as of a record date to be established for voting on the proposed business combination. Once available, shareholders of Arya III will also be able to obtain a copy of the S-4, including the proxy statement/prospectus, and other documents filed with the SEC without charge, by directing a request to: ARYA Sciences Acquisition Corp III, 51 Astor Place, 10th Floor, New York, New York 10003, Attn: Secretary. The preliminary and definitive proxy statement/prospectus to be included in the registration statement, once available, can also be obtained, without charge, at the SEC’s website (www.sec.gov).Participants in the SolicitationArya III and Nautilus Biotechnology and their respective directors and executive officers may be considered participants in the solicitation of proxies with respect to the potential transaction described in this communication under the rules of the SEC. Information about the directors and executive officers of Arya III is set forth in Arya III’s final prospectus filed with the SEC pursuant to Rule 424(b) of the Securities Act of 1933, as amended (the “Securities Act”) on August 10, 2020 and is available free of charge at the SEC’s website at www.sec.gov or by directing a request to: ARYA Sciences Acquisition Corp III, 51 Astor Place, 10th Floor, New York, New York 10003, Attn: Secretary. Information regarding the persons who may, under the rules of the SEC, be deemed participants in the solicitation of the Arya III shareholders in connection with the potential transaction will be set forth in the registration statement containing the preliminary proxy statement/prospectus when it is filed with the SEC. These documents can be obtained free of charge from the sources indicated above.Non-SolicitationThis communication is not a proxy statement or solicitation of a proxy, consent or authorization with respect to any securities or in respect of the potential transaction and shall not constitute an offer to sell or a solicitation of an offer to buy the securities of Arya III, the combined company or Nautilus Biotechnology, nor shall there be any sale of any such securities in any state or jurisdiction in which such offer, solicitation, or sale would be unlawful prior to registration or qualification under the securities laws of such state or jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of the Securities Act.