Disclaimer 2 This presentation (“Presentation”) is provided for informational purposes only and has been prepared to assist interested parties in making their own evaluation with respect to the proposed business combination between ARYA Sciences Acquisition Corp III (“ARYA”) and Nautilus Biotechnology, Inc. (“Nautilus” or the “Company”) and related transactions (the “Potential Business Combination”) and for no other purpose. This information contained herein does not purport to be all-inclusive and none of ARYA, Nautilus, Jefferies LLC and Goldman Sachs & Co. LLC nor any of their respective affiliates nor any of its or their control persons, officers, directors, employees or representatives makes any representation or warranty, express or implied, as to the accuracy, completeness or reliability of the information contained in this Presentation. You should consult your own counsel and tax and financial advisors as to legal and related matters concerning the matters described herein, and, by accepting this Presentation, you confirm that you are not relying upon the information contained herein to make any decision. Without the express prior written consent of ARYA and Nautilus, this Presentation and any information contained within it may not be (i) reproduced (in whole or in part), (ii) copied at any time, (iii) used for any purpose other than your evaluation of the Potential Business Combination or (iv) provided to any other person, except your employees and advisors with a need to know who are advised of the confidentiality of the information.Forward Looking Statements. Certain statements in this Presentation may be considered forward-looking statements. Forward-looking statements generally relate to future events or ARYA’s or the Company’s future financial or operating performance. For example, statements concerning the following include forward-looking statements: the success and timing of product development activities; the Company’s expected commercial strategy; the ability to compete with other companies; the market size and growth potential and the ability to serve those markets; projected financial information; and the potential effects of the Potential Business Combination on the Company. In some cases, you can identify forward-looking statements by terminology such as “may,” “should,” “expect,” “intend,” “will,” “estimate,” “anticipate,” “believe,” “predict,” “potential,” or “continue,” or the negatives of these terms or variations of them or similar terminology. Such forward-looking statements are subject to risks, uncertainties, and other factors which could cause actual results to differ materially from those expressed or implied by such forward-looking statements. These forward-looking statements are based upon estimates and assumptions that, while considered reasonable by ARYA and its management, and Nautilus and its management, as the case may be, are inherently uncertain. New risks and uncertainties may emerge from time to time, and it is not possible to predict all risks and uncertainties. Factors that may cause actual results to differ materially from current expectations include, but are not limited to, risk related to Nautilus' ability to successfully develop and launch a commercial product and achieve market acceptance, raise additional funds that may be necessary for the operations of its business and product development, establish manufacturing capacity, manage its operations and potential growth and scale its business, protect its intellectual property, maintain effective internal controls, and the potential impact of the COVID-19 pandemic, as well as various other factors beyond management’s control including general economic conditions and other risks, uncertainties and factors set forth in the section entitled “Risk Factors” and “Cautionary Note Regarding Forward-Looking Statements” in ARYA’s final prospectus relating to its initial public offering, dated August 6, 2020, and other filings with the Securities and Exchange Commission (SEC). Nothing in this Presentation should be regarded as a representation by any person that the forward-looking statements set forth herein will be achieved or that any of the contemplated results of such forward-looking statements will be achieved. You should not place undue reliance on forward-looking statements in this Presentation, which speak only as of the date they are made and are qualified in their entirety by reference to the cautionary statements herein. Neither ARYA nor the Company undertakes any duty to update these forward-looking statements. Additional Information. In connection with the Potential Business Combination, ARYA intends to file with the SEC a registration statement on Form S-4 containing a preliminary proxy statement/prospectus of ARYA, and after the registration statement is declared effective, ARYA will mail a definitive proxy statement/prospectus relating to the proposed Business Combination to its shareholders. 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. ARYA’s shareholders 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 Nautilus, ARYA and the Business Combination. When available, the definitive proxy statement/prospectus and other relevant materials for the proposed Business Combination will be mailed to shareholders of ARYA as of a record date to be established for voting on the proposed Business Combination. Shareholders 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: ARYA Sciences Acquisition Corp III, 51 Astor Place, 10th Floor, New York, NY 10003.Participants in the Solicitation. ARYA, Nautilus and their respective directors and executive officers may be deemed participants in the solicitations of proxies from ARYA’s shareholders with respect to the proposed Business Combination. A list of the names of ARYA’s directors and executive officers and a description of their interests in ARYA is contained in ARYA’s final prospectus relating to its initial public offering, dated August 6, 2020, which was filed with the SEC 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, NY 10003. Additional information regarding the interests of the participants in the solicitation of proxies from ARYA’s shareholders with respect to the proposed Business Combination will be contained in the proxy statement/prospectus for the proposed Business Combination when available.No Offer or Solicitation. This communication is for informational purposes only and does not constitute, or form a part of, an offer to sell or the solicitation of an offer to sell or an offer to buy or the solicitation of an offer to buy any securities, and there shall be no sale of securities, in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended, and otherwise in accordance with applicable law. Certain information contained in this Presentation relates to or is based on studies, publications, surveys and the Company’s own internal estimates and research. In addition, all of the market data included in this Presentation involves a number of assumptions and limitations, and there can be no guarantee as to the accuracy or reliability of such assumptions. Finally, while the Company believes its internal research is reliable, such research has not been verified by any independent source. This meeting and any information communicated at this meeting are strictly confidential and should not be discussed outside your organization.The reader shall not rely upon any statement, representation or warranty made by any other person, firm or corporation (including, without limitation, Jefferies LLC, Goldman Sachs & Co. LLC or any of their affiliates or control persons, officers, directors and employees) in making its investment or decision to invest in the Company. None of ARYA, the Company, Jefferies LLC or Goldman Sachs & Co. LLC, nor any of their respective affiliates nor any of its or their control persons, officers, directors, employees or representatives, shall be liable to the reader for any information set forth herein or any action taken or not taken by any reader, including any investment in shares of ARYA or the Company. Nautilus Biotechnology Confidential – Do Not Distribute