Results of Operations and Financial Condition. On August 13, 2026 , Quantum-Si Incorporated (the “Company”) issued a press release announcing its results for the three and six months ended June 30, 2026 and provided a business update. A copy of the press release is furnished as Exhibit 99.1 hereto. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exc…

Entry into a Material Definitive Agreement. On June 18, 2026 (the “Effective Date”), Quantum-Si, Incorporated, a Delaware corporation (the “Company”), entered into a lease agreement (the “Lease Agreement”) with Sterling City Science South Development, LLC, a Delaware limited liability company, (the “Landlord”), pursuant to which the Company will lease approximately 54,374 square feet (the “Rentable Area”) of planned office, laboratory and manufacturing space located at 9955 Pacific Heights Bo…

Creation of a Direct Financial Obligation or an Obligation Under an Off-Balance Sheet Arrangement of a Registrant. The information included in

Results of Operations and Financial Condition. On May 7, 2026 , Quantum-Si Incorporated (the “Company”) issued a press release announcing its results for the three months ended March 31, 2026 and provided a business update. A copy of the press release is furnished as Exhibit 99.1 hereto. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)…

Results of Operations and Financial Condition. On March 3, 2026, Quantum-Si Incorporated (the “Company”) issued a press release announcing its results for the fourth quarter and full year ended December 31, 2025 and provided a business update. A copy of the press release is furnished as Exhibit 99.1 hereto. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended…

Results of Operations and Financial Condition. On November 5, 2025 , Quantum-Si Incorporated (the “Company”) issued a press release announcing its results for the three and nine months ended September 30, 2025 and provided a business update. A copy of the press release is furnished as Exhibit 99.1 hereto. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (t…

Termination of a Material Definitive Agreement. The information contained in

Creation of a Direct Financial Obligation or an Obligation Under an Off-Balance Sheet Arrangement of a Registrant. The information contained in

Entry into a Material Definitive Agreement. On September 23, 2025, Quantum-Si Incorporated (the “Company”) and Winchester Office LLC (“Winchester”) entered into a Settlement and Mutual Release Agreement (the “Mutual Release Agreement”) in connection with a lease dated December 28, 2021, by and between the Company, as tenant, and Winchester, as landlord (the “Lease Agreement”), for certain premises in the building located at 115 Munson Street, New Haven, CT, 06511 (the “Premises”). The Lease A…

Results of Operations and Financial Condition. On August 5, 2025 , Quantum-Si Incorporated (the “Company”) issued a press release announcing its results for the three and six months ended June 30, 2025 and provided a business update. A copy of the press release is furnished as Exhibit 99.1 hereto. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exch…

Entry into a Material Definitive Agreement. On July 3, 2025, Quantum-Si Incorporated (the “Company”) entered into a securities purchase agreement (the “Purchase Agreement”) with a certain institutional investor (the “Purchaser”) pursuant to which the Company agreed to issue and sell, in a registered direct offering (the “Registered Direct Offering”) an aggregate of (i) 18,200,000 shares (the “Shares”) of the Company’s Class A common stock, $0.0001 par value per share (the “Common Stock”) at a…

Termination of a Material Definitive Agreement. In connection with the Registered Direct Offering, the Company provided written notice, effective as of July 3, 2025, to Canaccord Genuity LLC of its election to terminate that certain Equity Distribution Agreement, dated December 11, 2024 for the Company’s at the market offering. At the time of termination, the Company had sold 23,425,650 shares of its Class A common stock under the Equity Distribution Agreement for aggregate gross proceeds of…

Results of Operations and Financial Condition. On May 15, 2025 , Quantum-Si Incorporated (the “Company”) issued a press release announcing its results for the three months ended March 31, 2025 and provided a business update. A copy of the press release is furnished as Exhibit 99.1 hereto. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”…

Results of Operations and Financial Condition. On March 3, 2025, Quantum-Si Incorporated (the “Company”) issued a press release announcing its results for the fourth quarter and full year ended December 31, 2024 and provided a business update. A copy of the press release is furnished as Exhibit 99.1 hereto. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended…

Entry into a Material Definitive Agreement. On January 3, 2025, Quantum-Si Incorporated (the “Company”) entered into a securities purchase agreement (the “Purchase Agreement”) with certain institutional investors (the “Purchasers”) pursuant to which the Company agreed to issue and sell, in a registered direct offering (the “Registered Direct Offering”) an aggregate of 15,625,000 shares (the “Shares”) of the Company’s Class A common stock, $0.0001 par value per share (the “Common Stock”) at a…

Termination of a Material Definitive Agreement. On December 11, 2024, the Company exercised its right to terminate that certain Equity Distribution Agreement (the “ Agreement ”), dated August 11, 2023, by and between the Company and Evercore Group L.L.C. (“ Evercore ”), as sales agent. The Agreement previously established an “at-the-market” offering program through which the Company had the right to sell, from time to time, through Evercore, up to an aggregate of $75 million of the Company’s…

Entry into a Material Definitive Agreement. On December 11, 2024, Quantum-Si Incorporated, a Delaware corporation (the “ Company ”) entered into an Equity Distribution Agreement (the “ Sales Agreement ”) with Canaccord Genuity LLC (“ Canaccord ”) to sell shares of the Company’s Class A common stock, par value $0.0001 (the “ Common Stock ”), having an aggregate offering price of up to $75 million (the “ Shares ”), from time to time through an “at the market offering” program under which Canacc…

Costs Associated with Exit or Disposal Activities. On November 21, 2024, Quantum-Si Incorporated (the “Company”) committed to an organizational restructuring program designed to streamline and focus its overall corporate resources, as well as align required resources to focus on future product development objectives, including its recently announced Proteus TM platform. As a result, the Company is terminating approximately 23% of its 187-employee workforce. In connection with the restructurin…

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing. On November 4, 2024, 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”), has fallen below $1.00 per share for 30 consecutive business days, the Compan…

Results of Operations and Financial Condition. On November 12, 2024 , Quantum-Si Incorporated (the “Company”) issued a press release announcing its results for the three and nine months ended September 30, 2024 and providing a business update. A copy of the press release is furnished as Exhibit 99.1 hereto. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended…

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing. On November 4, 2024, 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”), has fallen below $1.00 per share for 30 consecuti…

Chief Commercial Officer — Grace Johnston, Ph.D.: Grace Johnston resigned as Chief Commercial Officer and was replaced by Todd Bennett.

Results of Operations and Financial Condition. On August 7, 2024 , Quantum-Si Incorporated (the “Company”) issued a press release announcing its results for the three and six months ended June 30, 2024 and providing a business update. A copy of the press release is furnished as Exhibit 99.1 hereto. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exc…

Changes in the Registrant’s Certifying Accountant. On June 4, 2024, the Audit Committee of the Board of Directors (the “Audit Committee”) of Quantum-Si Incorporated (the “Company”) appointed PricewaterhouseCoopers LLP (“PwC”) as the Company’s independent registered public accounting firm, subject to completion of PwC’s standard client acceptance procedures, for the fiscal year ending December 31, 2024. On June 4, 2024, the Audit Committee also dismissed Deloitte & Touche LLP (“Deloitte”) as t…

Chairperson of the Board — Charles Kummeth: Charles Kummeth was elected to the Board and appointed as Chairperson of the Board, replacing Jonathan M. Rothberg.