X0306 4 2022-01-10 0001816431 Quantum-Si Inc QSI 0001864883 Stark John VIII C/O QUANTUM-SI INCORPORATED 530 OLD WHITFIELD STREET GUILFORD CT 06437 true true Chief Executive Officer Class A Common Stock 2022-01-10 4 S 0 172167 5.8561 D 1985070 D Class A Common Stock 2022-01-11 4 S 0 7702 6.2841 D 1977368 D The sales reported in this Form 4 were effected to cover tax withholding obligations in connection with the vesting of restricted stock units ("RSUs") that were granted on February 17, 2021 pursuant to a "sell to cover" provision included in the RSU Agreement. Represents the weighted average sales price per share. The shares sold at prices ranging from $5.71 to $6.41 per share. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer. Includes 1,731,372 RSUs. Each RSU represents the right to receive one share of common stock upon vesting. 425,865 RSUs vested on January 7, 2022, with 1,277,595 RSUs vesting in 12 equal quarterly installments thereafter beginning with the quarter ending March 31, 2022, subject to Mr. Stark's continued service through the applicable vesting date. 453,777 RSUs vest (i) on the closing of a financing in excess of $50 million within three years of Mr. Stark's start date at a share price greater than $16.08 (as adjusted), or (ii) if the Issuer is a publicly listed company and within three years of Mr. Stark's start date the closing price of the Issuer's shares is $16.08 (as adjusted) or more for any 20 trading days within any 30 consecutive trading day period, subject to Mr. Stark's continued service through the applicable vesting date. Represents the weighted average sales price per share. The shares sold at prices ranging from $6.25 to $6.34 per share. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer. /s/ Christian LaPointe, Ph.D., Attorney-in-Fact 2022-01-12