Welcome to our dedicated page for Quantum-Si Incorporated SEC filings (Ticker: QSI), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
This page compiles U.S. SEC filings for Quantum-Si Incorporated (Nasdaq: QSI), a proteomics technology and life sciences company focused on single-molecule protein analysis and Next-Generation Protein Sequencing. Here, investors can review how Quantum-Si reports its financial performance, capital structure, and material corporate events in official regulatory documents.
Quantum-Si’s periodic reports, such as its quarterly results furnished via Form 8-K, provide detail on product and service revenue, cost of revenue, research and development spending, selling, general and administrative expenses, and items like lease termination or legal settlement expenses. These filings also include condensed consolidated balance sheets and statements of operations, along with non-GAAP metrics such as adjusted total operating expenses and adjusted EBITDA, together with reconciliations to GAAP measures.
Capital markets and financing activities are documented in Forms 8-K and related registration statements. Examples include a registered direct offering of Class A common stock and pre-funded warrants, an at-the-market Sales Agreement for Class A common stock, and the termination of a prior equity distribution agreement. Filings describe intended uses of proceeds, such as funding the Proteus platform development, commercialization, manufacturing development, research and development, and general corporate purposes.
Other material agreements and corporate actions, including lease terminations, settlement and mutual release agreements, and inducement equity awards under the 2023 Inducement Equity Incentive Plan, are also reported in Quantum-Si’s SEC filings. Stock Titan’s interface adds AI-powered summaries that highlight key terms, financial impacts, and timelines from these documents, helping readers quickly understand complex agreements, capital raises, and operating decisions without reading every line of each filing.
Quantum-Si Incorporated filed an amended Form S-3 shelf registration that establishes a base prospectus to offer up to
The company reports 164,357,534 shares of Class A outstanding and 19,937,500 Class B shares (all held by Chairman Jonathan M. Rothberg, Ph.D.) giving Class B holders 20 votes per share. Material dilution sources disclosed include reserved shares for equity plans, outstanding options and RSUs, and 3,833,319 Public Warrants plus 135,000 Private Warrants. The prospectus reiterates standard risk factors, forward-looking statement caution and sources for incorporated SEC filings.
Quantum-Si Incorporated disclosed in an 8-K that it has furnished a Sales Agreement dated September 26, 2025 between the company and Leerink Partners LLC, which is included as Exhibit 1.1 by reference to a Form S-3 filed the same day. The filing identifies the company’s Class A common stock (QSI) and redeemable warrants (QSIAW) listed on Nasdaq and confirms corporate identifying details.
The submission provides the existence and date of the Sales Agreement but includes no substantive commercial or financial terms, share amounts, placement mechanics, or expected proceeds within the 8-K text itself.
Quantum-Si Incorporated has filed a shelf registration on Form S-3 to offer up to $300,000,000 of various securities, which includes a sales agreement to sell up to $100,000,000 of Class A common stock under an at-the-market arrangement with Leerink Partners. The prospectus describes the terms and mechanics for multiple security types including Class A and Class B common stock, preferred stock, debt securities, warrants, rights and units, and includes detailed conversion, voting and redemption provisions. As of June 30, 2025, the company reported 164,357,534 shares of Class A common stock outstanding and 19,937,500 shares of Class B common stock outstanding, all held by the Chairman and affiliates, with Class B shares carrying 20 votes per share. The filing discloses reserved shares for equity plans and outstanding warrants, option pools and a weighted average option exercise price of $2.51. The prospectus incorporates prior SEC reports by reference and highlights risk factors, use-of-proceeds discretion by management, and potential dilution from future issuances.
Quantum-Si Incorporated entered into a Settlement and Mutual Release Agreement with Winchester Office LLC on September 23, 2025 to terminate a lease for premises at 115 Munson Street in New Haven, Connecticut. The lease, originally expected to run through July 31, 2032, will now end effective September 23, 2025, when the company surrenders the premises and its rent obligations cease.
As consideration for the early termination and settlement of all disputes, Quantum-Si agreed to pay a Termination Fee equal to an aggregate of $11,000,000.00, less a $272,618.16 credit for September 1, 2025 monthly recurring charges and the surrender of a security deposit of $573,214.50. The arrangement is described as a material definitive agreement and also as a direct financial obligation for the company.
Christian LaPointe, Ph.D., General Counsel and Corporate Secretary of Quantum-Si Inc. (QSI), reported routine share dispositions related to tax withholding on vested restricted stock units.
On 09/22/2025 and 09/23/2025 LaPointe sold 5,364 shares on each date under a mandatory sell-to-cover provision, for total reported sales of 10,728 shares. The weighted average sales prices were $1.6826 (shares sold $1.64–$1.72) and $1.635 (shares sold $1.57–$1.79). Following the transactions, beneficial ownership is reported as 966,170 shares after the first sale and 960,806 shares after the second sale. The sales were reported on a Form 4 signed by an attorney-in-fact on 09/24/2025.
Jeffrey Alan Hawkins, President & CEO and a director of Quantum-Si Inc. (QSI), reported two routine stock sales to cover taxes related to vested restricted stock units. On 09/22/2025 he sold 10,643 shares at a weighted average price of $1.6826, reducing his beneficial ownership to 2,612,368 shares. On 09/23/2025 he sold an additional 10,643 shares at a weighted average price of $1.635, reducing his beneficial ownership to 2,601,725 shares. The filings state these sales were mandatory sell-to-cover transactions for required federal, state and local withholding taxes tied to vested RSUs and that the reporter could not alter the sell-to-cover provision.
Quantum-Si Inc (QSI) insider sale summary: John S. Vieceli, identified as Chief Product Officer and a director-level reporting person, disclosed sales of Class A common stock tied to the vesting of previously granted restricted stock units. On 09/22/2025 he sold 9,843 shares at a weighted average price of $1.6826 per share and reported beneficial ownership of 832,743 shares after that sale. On 09/23/2025 he sold another 9,843 shares at a weighted average price of $1.635 per share and reported beneficial ownership of 822,900 shares thereafter. The filing states these sales were mandatory "sell-to-cover" transactions to satisfy federal, state and local withholding taxes and that the reporting individual could not alter that provision.
Jeffry R. Keyes, Chief Financial Officer of Quantum-Si Inc. (QSI), reported two routine stock sales tied to vested restricted stock units. The filing shows sales on 09/22/2025 and 09/23/2025 of 3,873 shares each day under a mandatory sell-to-cover provision used to satisfy federal, state and local tax withholding on vesting RSUs. The weighted average sale prices were $1.6826 (shares sold ranged $1.64–$1.72) and $1.635 (shares sold ranged $1.57–$1.79). Beneficial ownership reported after the transactions was 1,175,697 shares following the 09/22 sale and 1,171,824 shares following the 09/23 sale. The filer notes the sell-to-cover is mandatory and not subject to trustee election; the form was signed by an attorney-in-fact on 09/24/2025.
Bennett Todd C., Chief Commercial Officer and director of Quantum-Si Inc. (QSI), reported two mandatory sell-to-cover transactions tied to vested restricted stock units on 09/22/2025 and 09/23/2025. On each date he sold 18,482 shares of Class A common stock, totaling 36,964 shares sold to cover required federal, state and local withholding taxes.
The weighted average sale prices reported were $1.6826 on 09/22/2025 (shares sold ranged $1.64–$1.72) and $1.635 on 09/23/2025 (shares sold ranged $1.57–$1.79). Following the transactions, beneficial ownership was reported as 700,003 shares and then 681,521 shares, respectively. The filing was signed by an attorney-in-fact on 09/24/2025.
Jonathan M. Rothberg and affiliated entities disclosed holdings in Quantum-Si Inc. across both Class A and Class B stock classes and filed Amendment No. 4 to their Schedule 13D. For Class A, the filing reports beneficial ownership of 14,276,415 shares, representing 7.8% of the 182,557,698 Class A shares outstanding as of July 31, 2025; that amount includes personal shares, options exercisable within 60 days, and shares held by trusts and affiliated entities.
The filing also reports beneficial ownership of 19,937,500 Class B shares, representing 100% of outstanding Class B stock. As part of estate planning, trusts for Dr. Rothberg's children adopted a Rule 10b5-1 trading plan allowing sales of up to 8,973,841 Class A shares during the plan period from January 14, 2026 through January 14, 2027, subject to minimum price parameters; no assurance any sales will occur. The amendment adds the Rule 10b5-1 plan as Exhibit 5.