Offerings - Offering: 1	Feb. 26, 2026 USD ($) shares
Offering:
Fee Previously Paid	false
Other Rule	true
Security Type	Equity
Security Class Title	Class A common stock, par value $0.0001 per share
Amount Registered \| shares	8,654,750
Proposed Maximum Offering Price per Unit	0.98
Maximum Aggregate Offering Price	$ 8,481,655.00
Fee Rate	0.01381%
Amount of Registration Fee	$ 1,171.32
Offering Note	(1) Pursuant to Rule 416(a) under the Securities Act of 1933, as amended (the "Securities Act"), this Registration Statement on Form S-8 also covers any additional shares of Class A common stock, par value $0.0001 per share ("Class A Common Stock"), of Quantum-Si Incorporated (the "Registrant") which may become issuable under the Quantum-Si Incorporated 2021 Equity Incentive Plan (the "2021 Plan") in respect of the securities identified in the above table as a result of any stock dividend, stock split, recapitalization or other similar transaction, and any other securities with respect to which the outstanding shares are converted or exchanged. (2) Represents an increase of 8,654,750 shares of Class A Common Stock reserved for issuance under the 2021 Plan, by operation of the 2021 Plan's "evergreen" provision. The maximum number of shares which may be sold upon the exercise of options or issuance of stock-based awards granted under the 2021 Plan is subject to adjustment in accordance with certain anti-dilution and other provisions of the 2021 Plan. (3) Estimated solely for the purpose of calculating the amount of the registration fee pursuant to Rule 457(c) and Rule 457(h) promulgated under the Securities Act. The offering price per share and the aggregate offering price for shares reserved for future grant or issuance under the 2021 Plan are based on the average of the high and the low price of Registrant's Class A common stock as reported on The Nasdaq Global Market as of February 25, 2026.

true

Class A common stock, par value $0.0001 per share

Proposed Maximum Offering Price per Unit

0.98

0.01381%

(1) Pursuant to Rule 416(a) under the Securities Act of 1933, as amended (the "Securities Act"), this Registration Statement on Form S-8 also covers any additional shares of Class A common stock, par value $0.0001 per share ("Class A Common Stock"), of Quantum-Si Incorporated (the "Registrant") which may become issuable under the Quantum-Si Incorporated 2021 Equity Incentive Plan (the "2021 Plan") in respect of the securities identified in the above table as a result of any stock dividend, stock split, recapitalization or other similar transaction, and any other securities with respect to which the outstanding shares are converted or exchanged. (2) Represents an increase of 8,654,750 shares of Class A Common Stock reserved for issuance under the 2021 Plan, by operation of the 2021 Plan's "evergreen" provision. The maximum number of shares which may be sold upon the exercise of options or issuance of stock-based awards granted under the 2021 Plan is subject to adjustment in accordance with certain anti-dilution and other provisions of the 2021 Plan. (3) Estimated solely for the purpose of calculating the amount of the registration fee pursuant to Rule 457(c) and Rule 457(h) promulgated under the Securities Act. The offering price per share and the aggregate offering price for shares reserved for future grant or issuance under the 2021 Plan are based on the average of the high and the low price of Registrant's Class A common stock as reported on The Nasdaq Global Market as of February 25, 2026.