144 0001076352 XXXXXXXX LIVE 0001816431 Quantum-Si Inc 001-39486 29 BUSINESS PARK DRIVE BRANFORD CT 06405 (203) 458-7100 ROTHBERG JONATHAN M Director Common Jefferies

520 Madison Ave New York NY 10022

3506267 11716541.00 142710000 12/27/2024 Nasdaq Common 12/31/2015 Private Purchase from Company Quantum-Si Inc N 6250000 12/31/2015 Cash Y 12/27/2024 09/11/2023 Jonathan M. Rothberg