Director — Dr. Ray Johnson: A board member resigned without any stated disagreement, representing a standard director departure rather than a senior executive loss.

Chief Operating Officer — David Rivas: The filing discloses the internal promotion of the Chief Technology Officer to the newly created role of Chief Operating Officer, which is a succession event rather than a departure.

of this Current Report (including Exhibit 99.1 hereto) is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (“Exchange Act”), or otherwise subject to liabilities of that section, and shall not be deemed incorporated by reference into any filing under the Exchange Act or the Securities Act of 1933, as amended (“Securities Act”), except as expressly set forth by specific reference in such filing.

Unregistered Sales of Equity Securities. The information set forth in

Other Events. On May 20, 2026, Rigetti Sub entered into a letter of intent (the “Letter of Intent”) with the U.S. Department of Commerce with respect to a proposed $100 million award (the “Award”) under the U.S. CHIPS and Science Act over a three-year period to accelerate superconducting quantum computing research and development. The Letter of Intent contemplates that the Department will be issued shares of the Company’s common stock in an amount consistent with the total amount of the Award…

of this Current Report (including Exhibit 99.1 hereto) is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (“Exchange Act”), or otherwise subject to liabilities of that section, and shall not be deemed incorporated by reference into any filing under the Exchange Act or the Securities Act of 1933, as amended (“Securities Act”), except as expressly set forth by specific reference in such filing.

Entry into a Material Definitive Agreement. On April 17, 2026 (“Effective Date”), Rigetti & Co, LLC. (“Subtenant”), a wholly-owned subsidiary of Rigetti Computing, Inc., entered into a Sublease Agreement (the “Sublease”) with Chinook Therapeutics, Inc. (the “Sublandlord”), pursuant to which Subtenant will lease approximately 12,543 rentable square feet of office and laboratory space located at 740 Heinz Avenue, Berkeley, California, 94710 (the “Premises”) from the Sublandlord. The Premises re…

Director — H. Gail Sandford: Ms. Sandford decided not to stand for re-election to the Board of Directors upon the completion of her current term.

of this Current Report (including Exhibit 99.1 hereto) is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (“Exchange Act”), or otherwise subject to liabilities of that section, and shall not be deemed incorporated by reference into any filing under the Exchange Act or the Securities Act of 1933, as amended (“Securities Act”), except as expressly set forth by specific reference in such filing.

of this Current Report (including Exhibit 99.1 hereto) is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (“Exchange Act”), or otherwise subject to liabilities of that section, and shall not be deemed incorporated by reference into any filing under the Exchange Act or the Securities Act of 1933, as amended (“Securities Act”), except as expressly set forth by specific reference in such filing.

Other Events. On September 2, 2025, the Company announced that it had signed an MOU with C-DAC. Through this MOU, the Company and C-DAC intend to explore the co-development of hybrid quantum computing systems to support government laboratories and academics pursuing quantum computing research and development. The Company and C-DAC intend to collaborate on the design and development of hybrid quantum computing systems and related technologies and bring them to market. The Company and C-DAC exp…

of this Current Report (including Exhibit 99.1 hereto) is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (“Exchange Act”), or otherwise subject to liabilities of that section, and shall not be deemed incorporated by reference into any filing under the Exchange Act or the Securities Act of 1933, as amended (“Securities Act”), except as expressly set forth by specific reference in such filing.

Other Events. On June 11, 2025, the Company announced that it had completed sales of $350 million gross proceeds of common stock pursuant to its previously disclosed “at-the-market” equity offering program (the “ATM Program”). The Company sold an aggregate 30,309,780 shares of its common stock under the ATM Program. The Company intends to use the proceeds generated by the ATM Program for working capital, capital expenditures and other general corporate purposes, and may also use a portion of…

Entry into a Material Definitive Agreement. On May 29, 2025, Rigetti Computing, Inc. (the “Company”) entered into an Open Market Sale Agreement SM (the “Agreement”) with Jefferies LLC (the “Agent”) with respect to an “at-the market” offering program, pursuant to which the Company may issue and sell, from time to time at its sole discretion, shares of its common stock, par value $0.0001 per share (“Company Common Stock”), through or to the Agent having an aggregate offering price of up to $350…

of this Current Report (including Exhibit 99.1 hereto) is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (“Exchange Act”), or otherwise subject to liabilities of that section, and shall not be deemed incorporated by reference into any filing under the Exchange Act or the Securities Act of 1933, as amended (“Securities Act”), except as expressly set forth by specific reference in such filing.

Director — Ray O. Johnson: Mr. Johnson's reclassification from Class I to Class III director is an administrative adjustment.

of this Current Report (including Exhibit 99.1 hereto) is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (“Exchange Act”), or otherwise subject to liabilities of that section, and shall not be deemed incorporated by reference into any filing under the Exchange Act or the Securities Act of 1933, as amended (“Securities Act”), except as expressly set forth by specific reference in such filing.

of this Current Report (including Exhibit 99.1 hereto) is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to liabilities of that section, and shall not be deemed incorporated by reference into any filing under the Exchange Act or the Securities Act of 1933, as amended, except as expressly set forth by specific reference in such filing. Note Regarding Forward-Looking Stateme…

Director — Cathy McCarthy: Ms. McCarthy decided not to stand for re-election.

of this Current Report is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (“Exchange Act”), or otherwise subject to liabilities of that section, and shall not be deemed incorporated by reference into any filing under the Exchange Act or the Securities Act of 1933, as amended, except as expressly set forth by specific reference in such filing. Forward-Looking Statements This Current Report on Form 8-K contains “forwa…

Entry into a Material Definitive Agreement. Collaboration Agreement On February 27, 2025, Rigetti & Co, LLC (“Rigetti Sub”), a wholly-owned subsidiary of Rigetti Computing, Inc., a Delaware corporation (“Rigetti” or the “Company”), entered into a Collaboration Agreement (the “Collaboration Agreement”) with Quanta Computer Inc., a Taiwan corporation (“Quanta”). Pursuant to the Collaboration Agreement, Rigetti Sub and Quanta may enter into written statements of work from time to time pursuant t…

Termination of a Material Definitive Agreement. On December 9, 2024, Rigetti Computing, Inc. (the “Company”) paid in full and terminated the Loan and Security Agreement, dated as of March 10, 2021 and as amended and restated on June 21, 2024 (the “Loan Agreement”), by and among Rigetti & Co., LLC (as successor-in-interest to Rigetti & Co., Inc., a Delaware corporation), a Delaware limited liability company, Rigetti Intermediate LLC, a Delaware limited liability company, and the Company as the…

Entry into a Material Definitive Agreement. On November 26, 2024, Rigetti Computing, Inc. (the “Company”) entered into securities purchase agreements (the “Purchase Agreements”) with two institutional investors (the “Purchasers”) pursuant to which the Company agreed to issue and sell, in a registered direct offering (the “Registered Direct Offering”) an aggregate of 50,000,000 shares (the “Shares”) of the Company’s common stock, $0.0001 par value per share (the “Common Stock”) at a price of $…

Other Events. On November 25, 2024, the Company announced that it has completed sales of $100 million gross proceeds of common stock pursuant to its previously disclosed “at-the-market” equity offering program (the “ATM Program”) since the commencement of the ATM Program in March 2024. Since September 30, 2024, the Company has received aggregate net proceeds of approximately $58.4 million (after deducting commissions and offering expenses) upon the sale of 38,091,364 shares of its common stoc…

of this Current Report (including Exhibit 99.1 hereto) is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (“Exchange Act”), or otherwise subject to liabilities of that section, and shall not be deemed incorporated by reference into any filing under the Exchange Act or the Securities Act of 1933, as amended (“Securities Act”), except as expressly set forth by specific reference in such filing.