Quantum-Si Inc (0001816431) (Filer)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 14, 2026

QUANTUM-SI INCORPORATED

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (866) 688-7374

N/A

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company      o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Item 8.01     Other Events.

As previously disclosed, on July 23, 2026, Quantum-Si Incorporated (the “Company”) received written notice (the “Notice”) from the Listing Qualifications Department (the “Staff”) of The Nasdaq Stock Market LLC (“Nasdaq”) notifying the Company that, because the closing bid price for the Company’s Class A common stock, par value $0.0001 per share (the “Common Stock”), had fallen below $1.00 per share for 30 consecutive business days, the Company no longer met the minimum bid price requirement for continued inclusion on The Nasdaq Global Market pursuant to Nasdaq Listing Rule 5450(a)(1) (the “Bid Price Requirement”), and that the Company had 180 days to regain compliance with the Bid Price Requirement.

On October 14, 2026, the Staff notified the Company that, as of October 13, 2026, the Company had regained compliance with the Bid Price Requirement and that the matter is now closed. The Company will continue to monitor the closing bid price of its Common Stock in the future. If the Company does not maintain compliance with Nasdaq Listing Rule 5450(a)(1) in the future, it is likely that Nasdaq will once again provide notice that the Company’s Class A common stock will be subject to delisting.

Also, on October 15, 2026, the Company issued a press release announcing that it regained compliance with Nasdaq’s continued listing requirements. A copy of the press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits.

(d)Exhibits.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.