Rigetti Computing, Inc.

Rule 10b5-1 Trading Arrangements

Other than as set forth below, during the three months ended March 31, 2026, none of our directors or officers (as defined in Rule 16a-1(f) promulgated under the Exchange Act) adopted or terminated any “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement” (as each term is defined in Item 408 of Regulation S-K).

On March 9, 2026, Ray Johnson, amember of our board of directors, (i)terminated the Rule 10b5-1 trading arrangement that he adopted on March 12, 2025 (the “Johnson Original Arrangement”) and (ii)adopted a new 10b5-1 trading arrangement(the “Johnson Modified Arrangement”). The Johnson Modified Arrangement represents the modification, as described in Rule 10b5-1(c)(1)(iv), of the Johnson Original Arrangement. The Johnson Modified Arrangement changed the amount, price and timing of the sale of the securities underlying such Rule 10b5-1 trading arrangement, but not the duration of such Rule 10b5-1 trading arrangement, which remains scheduled to terminate on June 10, 2027, subject to earlier termination upon the sale of all shares subject to the plan, or as otherwise provided in the plan. The aggregate number of shares of our Common Stock to be sold pursuant to the Johnson Modified Arrangement is up to 375,307 shares of our Common Stock. The aggregate number of shares of our Common Stock to be sold pursuant to the Johnson Original Arrangement was up to 265,088 shares of our Common Stock; as of the date of termination of the Johnson Original Arrangement, 166,715 shares of our Common Stock had been sold under the Johnson Original Arrangement.