Dashed lines mark market-closed periods (overnight, weekends & holidays)
About Quantum-Si
Quantum-Si (QSI) has a market cap of $162.45M as of August 2026 — #12 of the 12 pure-play quantum computing stocks by market value.
Quantum-Si is building a semiconductor chip-based platform for single-molecule protein sequencing using quantum-detection technology. Its Platinum Pro system targets proteomics research; next-gen Proteus instrument targets late 2026 commercial launch.
Sector
Healthcare
Industry
Medical Devices
Employees
145
Founded
2017
Headquarters
Guilford, CT
Shares Outstanding
217.8M
Quantum Division
https://www.quantum-si.com/technology/
Quantum Technology
Roadmap Target
Proteus commercial launch late 2026 (18+ amino acids, ~1,000× throughput); 20 of 20 amino acids by 2027
Quantum-Si is NOT a quantum computing company. It uses quantum tunneling detection in a CMOS semiconductor chip for single-molecule protein sequencing (proteomics). Current product: Platinum Pro (launched Jan 2025, V4 kit detects 17 of 20 amino acids). Next-gen: Proteus instrument (late 2026 commercial launch target) — 18+ amino acids at launch, tens of millions of peptides per experiment (vs. tens of thousands on Platinum Pro), ~90 min run time. Successful sequencing on integrated Proteus instruments (April 2026, KinetIQ Array dev kit, 17 amino acids); Early Access Program summer 2026.
Cash Position & Runway
Total Cashⓘ
$127.38M
TTM Cash Burnⓘ
$94.72M
per year (TTM)
Cash Runwayⓘ
16 mo
Total Debtⓘ
$0.00
Quarterly Operating Cash Flow
Red bars = cash burn (negative operating CF). Green = cash-flow positive. Source: SEC EDGAR 10-Q filings.
Financial Metrics (Annual)
Total Revenueⓘ
$2.44M
Revenue Growth (YoY)ⓘ
-20.3%
Gross Marginsⓘ
47.33%
Operating Marginsⓘ
-4765.97%
Net Marginsⓘ
-4160.06%
Total Debtⓘ
$0.00
P/E Ratio (TTM)ⓘ
—
EPS (TTM)ⓘ
$-0.5100
Price / Bookⓘ
0.81
Earnings Per Share (TTM)
EPS (TTM)ⓘ
$-0.5100
Unprofitable
P/E Ratioⓘ
—
Price / Bookⓘ
0.81
Price-to-Book
Returns vs S&P 500
1Y
3Y
5Y
Source: price_history vs SPY · Periods where price history is unavailable are hidden
Government Contracts & Grants
Total Obligated
$381.06K
Awards Found
5
Excluded: Subcontracts, state/local funding, classified contracts, awards <~$30k.
Source: USAspending.gov · Updated quarterly
Shares Outstanding History
Share-count history will appear here once Quantum-Si has filed enough reports with the SEC to chart a trend. Recently listed companies start with a single data point.
Daily Short Volume (FINRA)
Latest Short Vol %
66.7%
2026-07-29
Short Volume
2,001,134
| Date | Short Vol | Total Vol | Short % |
|---|---|---|---|
| 2026-07-29 | 2,001,134 | 3,001,329 | 66.7% |
| 2026-07-27 | 357,898 | 695,781 | 51.4% |
| 2026-07-24 | 1,145,144 | 1,811,128 | 63.2% |
| 2026-07-22 | 1,044,775 | 2,008,320 | 52% |
| 2026-07-17 | 852,392 | 1,628,533 | 52.3% |
| 2026-07-16 | 1,594,476 | 2,300,890 | 69.3% |
| 2026-07-15 | 646,717 | 1,277,359 | 50.6% |
| 2026-07-13 | 1,242,050 | 2,231,554 | 55.7% |
| 2026-07-10 | 1,250,043 | 1,988,395 | 62.9% |
| 2026-07-09 | 704,745 | 1,687,317 | 41.8% |
Source: FINRA CNMS · Not the same as total short interest (outstanding positions) · Updated daily
Recent Research Papers (arXiv)
arXiv ↗Quantum SI: The New System of Units
Star-Mesh Quantized Hall Array Resistance Devices
Conception of an enhanced mechanism for a new Kibble balance directly traceable to the quantum SI
Challenges to miniaturizing cold atom technology for deployable vacuum metrology
Source: arXiv.org API · Papers mentioning company name · Updated every 48 hours
StockTwits Sentiment
Source: StockTwits · last 30 messages · updated every 4h
Recent News
Press Releases
GlobeNewswire ↗Source: Company newsroom (direct) + wire services (GlobeNewswire, PR Newswire) via Finnhub
News Mention Volume (30 days)
Articles indexed every 4h · Sentiment scored via Loughran-McDonald financial word lists (bullish/bearish keyword frequency). Not ML-based — scores reflect word presence only and may not capture context or sarcasm.
SEC Filings & Earnings Reports
View annual, quarterly, and material-event filings on SEC EDGAR
FY 2025
Quantum-Si posts ~$11M revenue in FY2025 as net losses persist; Platinum Pro launched, Proteus on track for 2026
Management expects Proteus to launch commercially by end of 2026; international distribution network expansion planned for 2026 to support Proteus market awareness.
FY 2024
Revenue
$3.10M
▲ 186.5% YoY
Net Income
-$101.00M
Quantum-Si posts $3.1M revenue in FY2024 first full commercial year, net loss narrows slightly to $101M
Company targeting broader commercial adoption via Platinum Pro shipments (Q1 2025), Avantor distribution ramp, and 18+ international partners; longer-term growth anchored on next-gen Proteus platform. Continued losses expected as R&D and commercialization spending remains elevated.
FY 2023
Revenue
$1.08M
Net Income
-$95.96M
Cash
$133.86M
Quantum-Si posts first-ever $1.1M revenue but burns $96M as pre-commercial losses persist
Management expects cash and marketable securities of $257.7M to fund operations for at least 12 months. Continued negative operating cash flows anticipated until commercial scale is achieved. ATM offering of up to $75M available but unused. Capital expenditures expected to remain ~$4.5M annually.
FY 2022
Net Income
-$132.44M
Cash
$351.30M
Quantum-Si burns $132M in FY2022 with zero revenue; $351M cash runway intact
Management expects to launch Carbon automated sample prep instrument in 2023 and believes existing $351M in cash and securities is sufficient for at least 12 months. Restructuring targets cost reduction; however, negative operating cash flows are expected to continue for the foreseeable future.
FY 2021
Net Income
-$94.99M
Cash
$471.30M
Quantum-Si burns $95M in FY2021 with zero revenue; SPAC deal nets $511M cash war chest
Company targets commercial launch of Platinum NGPS and Carbon sample prep instruments in H2 2022 (RUO); expects continued heavy spending on R&D, sales/marketing, and headcount build-out; believes $471.3M in cash/securities sufficient for at least 12 months of operations.
FY 2020
Revenue
$0.00
Net Income
-$263.14K
Cash
$1.03M
HighCape SPAC raised $115M in IPO, seeking life sciences acquisition by Sept 2022
Pending closing of Quantum-Si Business Combination; $425M PIPE financing secured. If combination fails, Trust liquidated and warrants expire worthless.
10-K · 10-Q · 20-F · 40-F · 6-K filings
All Filings ↗| Date Filed | Form | Period Covered | |
|---|---|---|---|
| 2026-05-07 | 10-Q | 2026-03-31 | EDGAR ↗ |
| 2026-03-03 | 10-K | 2025-12-31 | EDGAR ↗ |
| 2025-11-05 | 10-Q | 2025-09-30 | EDGAR ↗ |
| 2025-08-05 | 10-Q | 2025-06-30 | EDGAR ↗ |
| 2025-05-15 | 10-Q | 2025-03-31 | EDGAR ↗ |
| 2025-03-03 | 10-K | 2024-12-31 | EDGAR ↗ |
| 2024-11-12 | 10-Q | 2024-09-30 | EDGAR ↗ |
| 2024-08-07 | 10-Q | 2024-06-30 | EDGAR ↗ |
| 2024-05-09 | 10-Q | 2024-03-31 | EDGAR ↗ |
| 2024-02-29 | 10-K | 2023-12-31 | EDGAR ↗ |
| 2023-11-09 | 10-Q | 2023-09-30 | EDGAR ↗ |
| 2023-08-07 | 10-Q | 2023-06-30 | EDGAR ↗ |
| 2023-05-11 | 10-Q | 2023-03-31 | EDGAR ↗ |
| 2023-03-17 | 10-K | 2022-12-31 | EDGAR ↗ |
| 2022-11-08 | 10-Q | 2022-09-30 | EDGAR ↗ |
| 2022-08-08 | 10-Q | 2022-06-30 | EDGAR ↗ |
| 2022-05-10 | 10-Q | 2022-03-31 | EDGAR ↗ |
| 2022-03-01 | 10-K | 2021-12-31 | EDGAR ↗ |
| 2021-11-15 | 10-Q | 2021-09-30 | EDGAR ↗ |
| 2021-08-16 | 10-Q | 2021-06-30 | EDGAR ↗ |
| 2021-06-10 | 10-Q/A | 2021-03-31 | EDGAR ↗ |
| 2021-05-24 | 10-Q | 2021-03-31 | EDGAR ↗ |
| 2021-05-10 | 10-K/A | 2020-12-31 | EDGAR ↗ |
| 2021-03-30 | 10-K | 2020-12-31 | EDGAR ↗ |
| 2020-11-13 | 10-Q | 2020-09-30 | EDGAR ↗ |
Source: SEC EDGAR · Annual: 10-K / 20-F / 40-F · Quarterly: 10-Q / 6-K · AI summaries generated automatically
Earnings releases, contracts, leadership changes, offerings
All 8-Ks ↗Source: SEC EDGAR · Material events, earnings releases, contract announcements · Updated weekly
S-3 shelf registrations, 424B prospectuses, and document-verified foreign-issuer supplements represent potential dilution events. Quantum-Si has 29 such filings on record.
All Shelf Filings ↗Source: SEC EDGAR · S-3 = shelf registration, 424B3/B5 = active offering (dilutive)
SC 13G/D filers · >5% ownership
All 13G/D ↗| Institution | Form | % Owned | Filed |
|---|---|---|---|
| SC 13G/A | 4.77% | 2025-10-30 | |
| SC 13G | 5.30% | 2025-07-29 | |
| SC 13G | 7.00% | 2024-02-05 | |
| SC 13G/A | 6.10% | 2024-01-29 | |
| SC 13G/A | 2.30% | 2026-07-29 |
Source: SEC EDGAR SC 13G/D · Updated monthly
Open-market buys and sells by directors and officers
All Form 4s ↗90-Day Activity
| Filed | Insider | Type | Shares | Price |
|---|---|---|---|---|
| 2026-06-24 | ▼ SELL | 11,311 | $0.8990 | |
| 2026-06-24 | ▼ SELL | 11,310 | $0.9574 | |
| 2026-06-24 | ▼ SELL | 15,112 | $0.8990 | |
| 2026-06-24 | ▼ SELL | 15,111 | $0.9574 | |
| 2026-06-24 | ▼ SELL | 4,117 | $0.8990 | |
| 2026-06-24 | ▼ SELL | 4,116 | $0.9574 | |
| 2026-06-24 | ▼ SELL | 7,794 | $0.8990 | |
| 2026-06-24 | ▼ SELL | 7,794 | $0.9574 | |
| 2026-04-22 | ▼ SELL | 83,712 | $0.9950 | |
| 2026-04-22 | ▼ SELL | 83,712 | $1.01 | |
| 2026-04-22 | ▼ SELL | 37,381 | $0.9950 | |
| 2026-04-22 | ▼ SELL | 37,382 | $1.01 | |
| 2026-03-24 | ▼ SELL | 12,149 | $0.8266 | |
| 2026-03-24 | ▼ SELL | 11,628 | $0.8483 | |
| 2026-03-24 | ▼ SELL | 11,239 | $0.8266 | |
| 2026-03-24 | ▼ SELL | 10,758 | $0.8483 | |
| 2026-03-24 | ▼ SELL | 6,110 | $0.8266 | |
| 2026-03-24 | ▼ SELL | 5,849 | $0.8483 | |
| 2026-03-24 | ▼ SELL | 4,422 | $0.8266 | |
| 2026-03-24 | ▼ SELL | 4,233 | $0.8483 | |
| 2026-03-16 | ▲ BUY | 261,121 | — | |
| 2026-03-16 | ▲ BUY | 1,305,606 | — | |
| 2026-03-16 | ▲ BUY | 391,681 | — | |
| 2026-03-16 | ▲ BUY | 652,803 | — | |
| 2026-03-09 | ▲ BUY | 109,890 | $0.9505 | |
| 2026-03-09 | ▲ BUY | 500,000 | $0.9196 | |
| 2025-12-22 | ▼ SELL | 23,707 | $1.28 | |
| 2025-12-22 | ▼ SELL | 8,627 | $1.28 | |
| 2025-12-22 | ▼ SELL | 11,951 | $1.28 | |
| 2025-12-22 | ▼ SELL | 21,927 | $1.28 |
Source: SEC EDGAR Form 4 · Open-market buys and sells · Updated daily
Bull vs Bear: Analyst Opinions on Quantum-Si (QSI)
Generated from live analyst targets, SEC filings and market data as of August 2026 — not investment advice.
▲ THE BULL CASE
• Wall Street's mean price target of $2.50 implies 235% upside — consensus rating Buy across 3 analysts.
• 2 of 3 analyst ratings are Buy or Strong Buy.
• $381.06K in U.S. federal contracts and grants across 5 awards validates the technology with government customers.
• Retail sentiment on StockTwits runs 78% bullish over the last 9 scored posts.
▼ THE BEAR CASE
• Revenue declined 20% year-over-year to $2.44M (latest fiscal year).
• Only about 16 months of cash runway at the current burn rate — a capital raise (and dilution) is likely.
• 29 at-the-market / shelf offering filings (S-3 / 424B / SUPPL) on record — an active dilution channel.
• 66.7% of daily trading volume is short selling (FINRA), signaling heavy bearish positioning.
• Not yet profitable: net loss of $101.34M in the latest fiscal year.
How long is Quantum-Si's (QSI) cash runway?
Quantum-Si has roughly 16 months of cash runway as of August 2026 — $127.38M in cash divided by its trailing-twelve-month operating burn.
How much government funding has Quantum-Si received?
Quantum-Si has received $381.06K in U.S. federal contracts and grants across 5 tracked awards (USAspending.gov).
Is QSI stock at risk of shareholder dilution?
Dilution risk is elevated: 29 shelf/ATM offering filings on record, only ~16 months of cash runway.
What percentage of QSI's trading volume is short?
66.7% of QSI's daily trading volume was short selling as of 2026-07-29 (FINRA daily short volume).