Additional Information and Where to Find It
Supernova Partners Acquisition Company II (Supernova) has filed a registration statement on
Form S-4 with the Securities Exchange Commission (the SEC), which includes a proxy statement/prospectus, that will be both the proxy statement to be distributed to holders of
Supernovas common shares in connection with its solicitation of proxies for the vote by Supernovas shareholders with respect to the proposed business combination and other matters as may be described in the registration statement, as
well as the prospectus relating to the offer and sale of the securities to be issued in the business combination. After the registration statement is declared effective, Supernova will mail a definitive proxy statement/prospectus and other relevant
documents to its shareholders. This communication 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. Supernovas shareholders and other interested persons are advised to read, when available, the preliminary proxy statement/prospectus included in the registration statement 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 Rigetti Holdings, Inc. (Rigetti), Supernova 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 Supernova 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, the definitive proxy statement and other documents filed with the SEC, without charge, once available, at the SECs website at
www.sec.gov, or by directing a request to Supernovas secretary at 4301 50th Street NW, Suite 300 PMB 1044, Washington, D.C. 20016, (202) 918-7050.
Participants in the Solicitation
Supernova and its
directors and executive officers may be deemed participants in the solicitation of proxies from Supernovas shareholders 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 Supernova is contained in Supernovas prospectus dated March 3, 2021 relating to its initial public offering, which was filed with the SEC and is available free of charge at the SECs website at
www.sec.gov. To the extent such holdings of Supernovas securities may have changed since that time, such changes have been or will be reflected on Statements of Change in Ownership on Form 4 filed with the SEC. Additional information
regarding the interests of such participants will be contained in the proxy statement/prospectus for the proposed business combination when available.
Rigetti and its directors and executive officers may also be deemed to be participants in the solicitation of proxies from the shareholders of Supernova 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/prospectus for the
proposed business combination when available.
No Offer or Solicitation
This communication does not constitute (i) a solicitation of a proxy, consent or authorization with respect to any securities or in respect of the
proposed business combination or (ii) an offer to sell, a solicitation of an offer to buy, or a recommendation to purchase any security of Supernova, Rigetti, or any of their respective affiliates.
Forward-Looking Statements
Certain statements in this
communication may be considered forward-looking statements. Forward-looking statements generally relate to future events and can be identified by terminology such as pro forma, may, should, could,
might, plan, possible, project, strive, budget, forecast, 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
Supernova and its management, and Rigetti and its management, as the case may be, are inherently uncertain. Factors that may cause actual results to differ materially from current expectations include, but are not limited to: the outcome of any
legal proceedings that may be instituted against Supernova, Rigetti, the combined company or others following the announcement of the business combination and any definitive agreements with respect thereto; the inability to complete the business
combination due to the failure to obtain