Quantum-Si Incorporated Class A Common Stock

Day range

$1.36 – $1.48

Open

$1.43

Prev close

$1.40

Volume

7.38M

Market cap

$306.44M

Shares out

198.95M

P/E

—

P/S

190.93

P/B

1.70

P/FCF

—

ROE

-54.7%

ROA

-50.9%

Debt/Equity

0.00

Div yield

0.00%

As of Oct 23, 2026

• Listing deficiency noticeOct 15, 2026

  On July 23, 2026, Quantum-Si Incorporated received written notice ... notifying the Company that, because the closing bid price ... 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 ... and that the Company had 180 days to regain compliance.

• Product or service launchOct 8, 2026

  On October 8, 2026, the Company issued a press release announcing that it has demonstrated detection of 19 amino acids in its Proteus™ development program.

• Investor presentationSep 29, 2026

  From time to time, Quantum-Si Incorporated (the "Company") presents and/or distributes slides and presentations to the investment community to provide updates and summaries of its business. On September 28, 2026, the Company issued a press release and posted to its website a presentation used at World HUPO 2026 in Singapore on September 29, 2026 at 12:15 p.m. SGT.

• Listing deficiency noticeJul 24, 2026

  On July 23, 2026, Quantum-Si Incorporated received written notice from the Listing Qualifications Department of The Nasdaq Stock Market LLC notifying the Company that, because the closing bid price for the Company's Class A common stock has fallen below $1.00 per share for 30 consecutive business days, the Company no longer meets the minimum bid price requirement for continued inclusion on The Nasdaq Global Market pursuant to Nasdaq Listing Rule 5450(a)(1). Pursuant to Nasdaq Listing Rule 5810(c)(3)(A), the Company has been provided an initial period of 180 calendar days, or until January 19, 2027, to regain compliance with the Bid Price Requirement.

• Lease agreementJun 24, 2026

  Quantum-Si, Incorporated entered into a lease agreement with Sterling City Science South Development, LLC, pursuant to which the Company will lease approximately 54,374 square feet of planned office, laboratory and manufacturing space located at 9955 Pacific Heights Boulevard, San Diego, California. The Lease Agreement provides for a term of one hundred twenty (120) months from the commencement date, anticipated to be on or about September 1, 2027, with initial monthly base rent of approximately $315,369.20 ($5.80/square foot).

Days to cover

2.5

Short interest

11.83M

Avg volume

4.8M

As of Sep 30, 2026 · reported to FINRA twice monthly.

• Quantum-Si to Provide a Business Update and Report Third Quarter 2026 Financial Results on November 5, 2026
  neutralGlobeNewswire Inc.· Oct 16, 2026
• Quantum-Si Presents Interim Proteus™ Data at World HUPO 2026 Demonstrating a Significant Step Change in Performance Compared to Platinum® Pro
  positiveGlobeNewswire Inc.· Sep 28, 2026
• Why Quantum-Si Stock Flopped on Friday
  negativeThe Motley Fool· Oct 10, 2025
• Russell 2000 Hits All-Time Highs: 8 Stocks Power Small-Cap Comeback
  positiveBenzinga· Sep 18, 2025
• Quantum Stocks Explode as IonQ Channels Nvidia-Like Vision
  neutralInvesting.com· May 27, 2025