Rigetti Computing, Inc.

Rigetti Computing, Inc. (the “Company”) is unable to file, without unreasonable effort or expense, its Quarterly Report on Form 10-Q for the three and nine months ended September 30, 2022 (the “Q3 Form 10-Q”) with the Securities and Exchange Commission (the “SEC”) within the prescribed time period. As previously disclosed, on November 14, 2022, the audit committee of the Company’s board of directors (the “Audit Committee”), based on the recommendation of, and after consultation with, the Company’s management, and as discussed with BDO USA, LLP (“BDO”), the Company’s independent registered public accounting firm, concluded that the Company’s previously issued unaudited interim condensed consolidated financial statements for the quarters ended March 31, 2022 and June 30, 2022 (the “Affected Financials”), each as previously filed with the SEC, should no longer be relied upon and should be restated due to the matters described below. At the closing of the Company’s business combination with Supernova Partners Acquisition Company II Ltd

Supernova Partners Acquisition Company II, Ltd. (the “Company”) has determined that it is unable, without unreasonable effort or expense, to file its Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2021 (the “Q1 2021 Form 10-Q”) by the prescribed filing date due to the reasons described below. The Company is working diligently to complete the Q1 2021 Form 10-Q as soon as possible; however, given the scope of the process for evaluating the impact on the Company’s financial statements of the Staff Statement on Accounting and Reporting Considerations for Warrants Issued by Special Purpose Acquisition Companies (“SPACs”) issued by the staff of the Securities and Exchange Commission on April 12, 2021, the Company is unable to complete and file the Q1 2021 Form 10-Q by the required due date of May 17, 2021 without unreasonable effort and expense. The Company does, however, expect to file such report within five calendar days thereof. Forward-Looking Statements This notification contains “forward-looking statements.” These statements are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements reflect management’s current expectations based on currently available operating, financial and competitive information, but are subject to risks, uncertainties and assumptions that could cause actual results to differ materially from those anticipated in or implied by the forward-looking statements. Our forward-looking statements are generally identified with words such as “anticipate,” “believe,” budgeted,” “continue,” “could,” “estimate,” “expect,” “forecast,” “goal,” “intend,” “may,” “objective,” “plan,” “potential,” “predict,” “projection,” “scheduled,” “should,” or other similar words