Quantum-Si Inc (QSI)
Health Care · Proteomics instrumentation and consumables · NASDAQ
A proteomics instrumentation and consumables company bringing massively parallel single-molecule protein sequencing to researchers and clinicians through its Platinum platform, with a next-generation Proteus system in development.
What Quantum-Si Inc does
Quantum-Si is a life sciences company developing single-molecule detection platforms for proteomics research. The company provides next-generation protein sequencing (NGPS) technology enabling researchers and clinicians to analyze the proteome (the full set of proteins in a cell) in a massively parallel fashion rather than sequentially. Its current offerings include the Platinum NGPS line of instruments, analysis software, and consumable kits, with the next-generation Proteus platform anticipated to launch by end of 2026.
Themes: proteomics research, protein sequencing, single-molecule detection, biomarker discovery, life sciences instrumentation, consumables and reagents
Fundamentals
- Price$0.7906 as of 2026-08-26 close
- Market cap$172M as of 2026-08-27
- 1-year return-32.4% 2025-08-26 close $1.17 → 2026-08-26 close $0.7906
- P/En/a negative earnings
- Net margin-5605.9% as of 2026-08-27
- Gross margin+40.0% as of 2026-08-27
- ROE-47.3% as of 2026-08-27
- Debt / equity0.00 as of 2026-08-27
- Revenue growth (YoY)-46.2% as of 2026-08-27
- Beta3.30 as of 2026-08-27
- Last reported earnings2026-08-13 SEC EDGAR Form 8-K (Item 2.02)
How QSI compares in its sector
- net profit marginbottom 10% 504 covered Health Care peers, as of 2026-08-27
- operating marginbottom 10% 504 covered Health Care peers, as of 2026-08-27
- gross marginbottom 25% 384 covered Health Care peers, as of 2026-08-27
- return on equitymiddle range 576 covered Health Care peers, as of 2026-08-27
- free cash flow (absolute dollars, latest fiscal year)bottom 25% 493 covered Health Care peers, as of FY2025
Position among covered Health Care companies that report each metric (minimum 5 peers). A relative position within our covered catalog — not a valuation, quality, or investment judgment. A higher percentile is simply a higher value (for P/E, more expensive on earnings — never "better"). Informational only.
How Quantum-Si Inc looks technically
Quantum-Si Inc (QSI) is trading 24.3% below its 200-day average, the long-term trend line — a long-term downtrend. Its 50-day average crossed below its 200-day average about 158 trading days ago — a "death cross", a bearish long-term signal. There is no clear trend right now — the price is choppy (ADX, a 0–100 trend-strength gauge, is 19, below the 25 that marks a real trend), though buyers have been pushing harder than sellers lately — pressure, not a trend. Momentum is neutral — its 14-day RSI (a 0–100 momentum gauge) is 49, neither overbought (above 70) nor oversold (below 30). It made a new 20-day high about 2 trading days ago. It is 74.5% below its highest point of the past year.
Trend
8
| Distance from the 200-day | it is trading 24.3% below its 200-day average, the long-term trend line — a long-term downtrend | -24.3% |
|---|---|---|
| 50-day moving average | its average price over the last 50 trading days — a short-term trend line — is $0.83 | $0.83 |
| 200-day moving average | its average price over the last 200 trading days — the long-term trend line — is $1.04 | $1.04 |
| Swing structure | its recent peaks and dips disagree — one of them is rising while the other is not, so there is no clean up or down pattern in the swings | mixed — one of the two is not confirming |
| Last swing turn | its last significant turn was a swing low 12 calendar days ago — the swings before that are what the structure reading is measured on | 12 sessions |
| Wave structure | its recent swings can be read as a completed three-part downward correction — a pullback in the A-B-C shape Elliott-wave chartists use; the labelling fails if price closes below 0.71. It is the only labelling that fits, and it describes the swings already printed, not what comes next. | possible three-wave downward correction, complete |
| Since the 50/200 cross | its 50-day average crossed below its 200-day average about 158 trading days ago — a "death cross", a bearish long-term signal | 158 sessions |
| Trend strength (14-day ADX) | there is no clear trend right now — the price is choppy (ADX, a 0–100 trend-strength gauge, is 19, below the 25 that marks a real trend), though buyers have been pushing harder than sellers lately — pressure, not a trend | 18.8 |
Momentum
3
| 14-day RSI | momentum is neutral — its 14-day RSI (a 0–100 momentum gauge) is 49, neither overbought (above 70) nor oversold (below 30) | 49.2 |
|---|---|---|
| Position in its 14-day range | it is trading in the lower half of its 14-day range ($0.71 to $0.931) — its "stochastic" reading is 36 out of 100, where 0 would mean closing exactly at the 14-session low and 100 exactly at the high. This measures WHERE the price sits inside its recent range, which is a different question from the RSI beside it: RSI is a momentum gauge, measuring how FAST the price has been moving, so a stock can drift quietly to the bottom of its range with an ordinary RSI, or fall sharply and still sit in the middle. It has been slipping within that range over the last few sessions. | 36.5 |
| Since the MACD crossed zero | MACD, a trend-momentum gauge, is in positive territory (momentum leaning bullish) | 16 sessions |
Range
12
| 52-week high | its highest closing price over the past year (about 252 trading days) was $3.10 | $3.10 |
|---|---|---|
| From the 52-week high | it is 74.5% below its 52-week high (its highest price of the past year) | -74.5% |
| Above the 52-week low | it is 14.6% above its 52-week low (its lowest price of the past year) | +14.6% |
| Below the 52-week high | it is 74.5% below its highest point of the past year | 74.5% |
| Since a 20-day breakout | it made a new 20-day high about 2 trading days ago | 2 sessions |
| Since a 55-day breakout | it made a new 55-day low about 21 trading days ago | 21 sessions |
| All-time high | its highest closing price on record is $14.17 (set on 2021-07-12) | $14.17 |
| Given back of the 52-week move | over the past year its closes ranged ($0.702 to $2.63), and it has recovered only a small part of its fall from last year’s high — 5% of it. Chart-watchers call 61.8%-65% given back the "golden pocket" — for this company that is $1.89 to $1.96. It is watched widely enough that orders cluster there, which is the honest reason it matters; it is not a forecast. | 4.6% |
| From the all-time high | it is 94.4% below its all-time high | -94.4% |
| Nearest price level | it is trading 9.9% above a support level at $0.7125 — a price it turned at twice since 2026-04-02, most recently on 2026-08-14. Since 2024-08-26 it has 2 such levels below the current price and 14 above. Levels like these describe where the price has reversed or paused before; they are not a forecast of where it will go. | -9.9% |
| All-time low | its lowest closing price on record is $0.6121 (set on 2024-11-19) | $0.6121 |
| Above the all-time low | it is 29.2% above its all-time low | +29.2% |
Volatility
5
| Band width vs its own 6 months | day-to-day price swings are narrower than usual versus its own recent 6-month history (tighter than about 85% of it) | 15th percentile |
|---|---|---|
| Typical daily range | in a typical session it travels about $0.0667 between its high and its low — about 8.4% of its price. That is its "average true range" over the last 14 sessions, which also counts the distance from the previous close, so a day that opens well away from yesterday counts as the large move it was | $0.0667 |
| Bollinger bands (20-day, ±2σ) | most of its recent trading has stayed between about $0.7 and $0.85 — the "Bollinger bands", a range drawn two standard deviations either side of its 20-day average price, which widens when the stock gets more volatile and narrows when it settles | $0.7 – $0.78 – $0.85 |
| Typical daily range (% of price) | its price moves about 8.4% in a typical session — among the most volatile in the catalog. This is the average gap between a session's high and low over the last 14 sessions, counting overnight moves, expressed against the current price so it can be compared with companies trading at any price | 8.4% |
| Stretch from the 200-day average | it is trading 3.8 daily ranges below its 200-day average price (24.3% below it in plain percentage terms) — a way of asking how far it has stretched from its own average in units of how far it normally moves in a day, so a calm company and a jumpy one can be compared on the same scale | 3.8 daily ranges below its 200-day average |
Volume
1
| Volume vs its 30-day average | trading volume is about normal versus its 30-day average | 0.87× |
|---|
Analyst
2
| Change in the average price target | analysts have cut their average price target by 8.0% since the prior reading | -8.0% |
|---|---|---|
| Change in the consensus rating | not available for this company yet | n/a |
Candlestick patterns
3
| Since a doji | 7 sessions ago it opened and closed at almost the same price after trading through a wider range — a "doji", the classic picture of buyers and sellers finishing the session level | 7 sessions ago |
|---|---|---|
| Since a bullish engulfing | 5 sessions ago it opened below the previous session's close and finished above that session's open — a "bullish engulfing" pair, where one up day more than undid the down day before it | 5 sessions ago |
| Since a bearish engulfing | 9 sessions ago it opened above the previous session's close and finished below that session's open — a "bearish engulfing" pair, where one down day more than undid the up day before it | 9 sessions ago |
Price gaps
3
| Gap at the open | it opened on 2026-08-26 0.4% above the previous session's close — an overnight gap, the part of the move that happened while the market was shut, and traded back through that level before the close | +0.3% |
|---|---|---|
| Open gap | it gapped 2.6% above the previous close 1 session ago and has not traded back through the level it left behind at 0.77 — an "unfilled gap", which describes a price range no trade has since crossed and is not a forecast that it will be crossed | +2.6% |
| Gap filled | a 4.2% gap down opened on 2026-08-24 has been "filled" 1 session ago — price traded back through the level the gap left behind, and it took 1 session to close | 1 session ago |
Price streaks
1
| Closing streak | it closed lower in its latest session, after a session that did not close lower — a single down day rather than a run | 1 session down |
|---|
Relative strength
4
| vs market, 1 month | over the past 1 month this stock lagged the market by 1.0 percentage points (the stock gained 2.7% while the market gained 3.7%) | -1.0% |
|---|---|---|
| vs market, 3 months | over the past 3 months this stock lagged the market by 28.9 percentage points (the stock lost 26.8% while the market gained 2.1%) | -28.9% |
| vs market, 6 months | over the past 6 months this stock lagged the market by 32.9 percentage points (the stock lost 21.7% while the market gained 11.1%) | -32.9% |
| vs market, 12 months | over the past 12 months this stock lagged the market by 51.2 percentage points (the stock lost 32.4% while the market gained 18.7%) | -51.2% |
Signal agreement
2
| Bullish technical signals | 2 of the 9 technical signals we can compute for it are currently in a bullish state: a fresh 20-day high, MACD momentum is positive — these describe past price behaviour, not a forecast | 2 of 9 |
|---|---|---|
| Bearish technical signals | 4 of the 9 technical signals we can compute for it are currently in a bearish state: a "death cross" — its 50-day average is below its 200-day, trading below its 200-day average, lagging the market over 6 months, trading below the Ichimoku cloud — these describe past price behaviour, not a forecast | 4 of 9 |
Trend (Ichimoku cloud)
1
| Vs the Ichimoku cloud | trading 13% below the Ichimoku cloud — a band drawn from where its own highs and lows sat up to 2026-07-21 and projected forward over today's price, the side traders read as an established downtrend, with the band above acting as the level that would have to be cleared. The band itself is thick, spanning 14.4% of the share price, which is taken to mean a barrier that has held for a while and takes effort to cross. | -12.7% |
|---|
Volume-weighted price
2
| Vs this year’s average price paid | the price is 20% below the average price paid so far this year, so the typical buyer over that stretch is under water. That average is $0.9821 — a volume-weighted average of daily closes over 158 sessions, not a true tick-by-tick VWAP. | -19.5% |
|---|---|---|
| Vs the average paid since it last reported | the price is sitting right on the average price paid since it last reported on 2026-08-13 (its 10-Q), so the typical buyer over that stretch is roughly break-even. That average is $0.7869 — a volume-weighted average of daily closes over 10 sessions, not a true tick-by-tick VWAP. | +0.5% |
Price levels it has turned at before
QSI last closed at $0.7906 on 2026-08-26. Since 2024-08-26 it has turned at 2 prices below its last close and 14 above; the 2 nearest below and the 3 nearest above are listed, nearest first.
| Level | Side | Distance | Evidence |
|---|---|---|---|
| $0.7125 | Support | 9.9% below the last close | turned there twice · 2026-04-02 to 2026-08-14 |
| $0.8705 | Resistance | 10.1% above the last close | turned there four times · 2024-09-04 to 2026-05-08 |
| $0.695 | Support | 12.1% below the last close | turned there twice · 2024-11-01 to 2026-07-30 |
| $0.918 | Resistance | 16.1% above the last close | turned there three times · 2026-02-05 to 2026-08-13 |
| $1.02 | Resistance | 28.5% above the last close | turned there four times · 2024-11-11 to 2026-07-02 |
A level is a price this company reversed or paused at more than once — they describe past behaviour, not a forecast of where the price will go.
Wave structure
Its recent swings can be read as a three-part downward correction — the A-B-C shape chartists use for a pullback — now complete.
This labelling fails — stops being a possible reading at all — if it closes below $0.71.
It is the only labelling that fits these swings, though its proportions are not the textbook ones. It was chosen from 3 labellings that survived the rules, counting shorter readings of the same bars.
This reading has stood for 4 trading days, since 2026-08-21.
Read from daily closes as of 2026-08-26.
An Elliott-wave count describes the swings already printed and the level that would disprove it. It is not a forecast, a target, or advice.
Screens: Trading below the 200-day moving average · Pulled back from the 12-month high · Broke out to a new 20-day high · trendless / choppy (low ADX) · Analyst price target recently CUT · lagging the market | Learn: moving average · golden cross · adx · rsi · breakout · fifty two week high low
Based on daily closing prices as of 2026-08-26. Describes past price behavior only — informational, not financial advice.
Analyst consensus
- Consensus ratingBuy (1.67 mean, 1=Strong Buy…5=Strong Sell) — 3 analysts
- Mean price target$2.30 range $1.00 – $4.00; median $1.90
Analyst estimates, as of 2026-08-23. These are third-party analyst opinions and price targets, aggregated — not a recommendation, prediction, or advice from stocks-llm. Informational only.
Analyst EPS estimate for QSI
- Consensus EPS estimate-$0.12 next reporting period, as of 2026-08-23
Change over time is not available yet: it needs two readings of the same reporting period at least 30 days apart, and we have been recording these estimates since 2026-08-04. An estimate for a DIFFERENT quarter is not a revision, so a reading from before the last report is never compared with one after it.
The consensus estimate for the next reporting period, and how it has moved between readings of that SAME period. A change is measured only between readings estimating one period — when a company reports, the consensus moves to the next quarter and the two numbers are not comparable. Informational only, not a forecast and not advice.
Key risks (from latest filing)
["Proteus platform delay or failure to launch by end of 2026 or without promised customer-focused capabilities could materially impact market credibility and long-term financial success","Significant revenue decline (down 46% YoY) and deeply negative net margin (-5606%) indicate severe financial stress and limited path to profitability","New product launches and pending Proteus announcement may slow customer purchasing decisions for existing Platinum instruments and consumables, impacting near-term revenue"]
What changed in the latest 10-Q
AI-assisted comparison of QSI's 10-Q filed 2026-05-07 against the prior one filed 2025-11-05.
Management's Discussion & Analysis (MD&A)
- Added:
- Newer filing references Form 10-K for year ended December 31, 2025 filed March 3, 2026; older filing references Form 10-K for year ended December 31, 2024 filed March 3, 2025
- Newer filing covers three months ended March 31, 2026 and 2025; older filing covers three and nine months ended September 30, 2025 and 2024
- Newer filing adds: 'Our current platform includes our Platinum® NGPS line of instruments' (plural 'line' vs singular in older)
- Newer filing adds detailed financial table for three months ended March 31, 2026 vs 2025 showing product revenue decline from $808K to $216K
- Newer filing adds: 'In November 2025, we presented an updated technology and product roadmap'
- Newer filing adds: 'Proteus aims to provide single-molecule, amino acid level resolution while also providing anticipated significantly higher sequencing output per sample'
- Newer filing adds: 'The first generation of Proteus and associated sequencing consumables is anticipated to include motion control, liquid handling, and a new on-board single optical system'
- Newer filing adds: 'As a result of the anticipated launch of Proteus, we expect some customers may delay purchasing decisions for existing products, which is expected to adversely impact revenue until Proteus becomes commercially available'
- Newer filing adds comprehensive results of operations table with specific financial metrics and variance analysis
- Removed:
- Older filing includes 'Restructuring' section describing November 2024 organizational restructuring, 23% workforce reduction, and $2.3 million severance charges; not present in newer filing
- Older filing includes 'Equity Transactions' section with 'At-the-Market Equity Offering Program' describing September 26, 2025 Sales Agreement with Leerink Partners for $100 million offering; not present in newer filing (text cuts off)
- Older filing states 'Going forward, we intend to follow a systematic, phased approach to continue to successfully launch updates and enhancements to our platform'; removed in newer filing
- Older filing states Proteus 'is estimated to launch in the second half of 2026'; newer filing changes to 'anticipated to launch by the end of 2026'
- Older filing states 'Our evolving product roadmap provides for continued updates and enhancements'; newer filing replaces with 'In November 2025, we presented an updated technology and product roadmap'
- Reworded:
- Older: 'proprietary universal single-molecule detection platform'; Newer: 'proprietary, universal, single-molecule detection platform' (comma added)
- Older: 'Next-Gen Protein Sequencing™'; Newer: 'next-gen protein sequencing ("NGPS")' (formatting and capitalization change)
- Older: 'We believe that the ability'; Newer: 'We believe in the ability' (wording simplification)
- Older: 'Platinum NGPS instrument'; Newer: 'Platinum® NGPS line of instruments' (trademark and plural added)
- Older: 'Proteus is estimated to launch in the second half of 2026'; Newer: 'Proteus is anticipated to launch by the end of 2026' (timing language changed from 'second half' to 'by end')
- Older: 'Proteus aims to provide single molecule'; Newer: 'Proteus aims to provide single-molecule' (hyphenation added)
- Older: 'significantly higher sequencing output'; Newer: 'anticipated significantly higher sequencing output' (added 'anticipated')
- Notes:
- Newer filing text is truncated mid-sentence at 'Revenue, Cost of Revenue and Gross Profit' section; comparison limited to available text
- Older filing text is truncated at end of 'At-the-Market Equity Offering Program' section; full extent of removals cannot be verified
- Different fiscal periods compared (Q1 2026 vs Q3 2025) makes some structural differences expected
Risk Factors
- Added:
- Added forward-looking statement bullet point about Proteus™ platform anticipated to be commercially available by end of 2026 with customer-focused applications and capabilities (filed 2026-05-07)
- Added forward-looking statement bullet point about development and launch of new products potentially slowing or delaying customer purchasing decisions for existing instruments and consumables (filed 2026-05-07)
- Reworded:
- Reference to Annual Report on Form 10-K fiscal year changed from 'December 31, 2024' in older filing to 'December 31, 2025' in newer filing (reflects updated fiscal year reference)
- Notes:
- Balance sheet comparison shows different reporting periods (March 31, 2026 vs December 31, 2025 in newer filing; September 30, 2025 vs December 31, 2024 in older filing) making financial statement line-item changes not directly comparable
- Text provided appears truncated and incomplete for balance sheets in both filings
AI-assisted comparison of two SEC filing sections. It describes wording and theme changes only, makes no materiality, legal, or investment judgement, and is not financial advice. Informational only — not financial advice.
Insider activity (SEC Form 4)
0 open-market purchases and 8 open-market sales by insiders in the last 90 days.
- Last 90 days0 buys · 8 sells ($71160) — 4 selling insiders
- Last 180 days0 buys · 12 sells ($313517) — 4 selling insiders
Activity heuristic: net selling (a transparent product heuristic from the counts above, not a prediction or advice)
Most recent open-market transaction: 2026-06-23. As of 2026-08-27.
View full insider trading history → View SEC Form 3/4/5 filingsAsk about QSI's insider activity →
Only open-market purchases (SEC code P) and sales (code S) are counted here. Option exercises, vesting/awards, gifts, and shares withheld for taxes are excluded — they are compensation or mechanical, not open-market conviction. Sales may be planned and non-discretionary (e.g. a Rule 10b5-1 plan) and are not necessarily bearish; open-market buying is not a recommendation to buy. Informational only — not financial advice.
Institutional ownership (13F)
6 institutional 13F filers reported holding QSI as of 2026-03-31 (quarter-end position, filed within 45 days).
- Distinct 13F filers 6
- Reported shares held 24,433,951
- Reported value $18,911,877
reported quarterly holdings change (2025-12-31 → 2026-03-31): 1 new, 2 increased, 3 decreased, 0 exited. Change counts cover only managers that filed 13F reports in BOTH quarters, derived between two quarter-end snapshots — not same-day trades; a single manager is never said to have "bought" or "sold".
Institutional holdings are quarter-end long positions reported on SEC Form 13F-HR, filed up to 45 days after the quarter ends — they are delayed, are not real-time trades, exclude short positions and most non-US securities, and are not investment advice. Any increase/decrease is a reported change between two quarterly snapshots, not a same-day purchase or sale. These are quarter-end snapshots from the 13F filings on SEC EDGAR, filed within 45 days — not real-time, and any change is a difference between two quarterly reports, not a same-day trade. Informational only — not financial advice.
Short interest (FINRA)
QSI had 15,417,732 shares of reported short interest as of the 2026-07-31 FINRA settlement date (delayed, bi-monthly; not real-time).
Short interest as a percent of shares outstanding is not shown for QSI because we do not hold a verified share count to divide it by. The reported figures above are unaffected.
- Reported short interest (shares) 15,417,732
- Prior settlement (shares) 14,129,789
- Reported change 9.12%
- Days to cover (reported) 5.91
Reported to FINRA as of the 2026-07-31 settlement date. Short interest is reported to FINRA and published on a delayed, bi-monthly schedule (as of a settlement date, disseminated roughly eight business days later) — it is NOT real-time, does not cover every venue or all US trading, and is not a short-squeeze prediction or investment advice. Days-to-cover is the value FINRA reports; percent of float is not shown because the source file carries no share-count denominator — where a percent appears it is of shares OUTSTANDING, the larger base, and is therefore a floor on percent of float. Informational only — not financial advice.
Competitors & peers
- Thermo Fisher Scientific
- Agilent Technologies (A)
- PerkinElmer (PKI)
- Waters Corporation (WAT)
- Shimadzu
- Bruker Corporation
AI-enriched competitor set. Linked names are companies covered by stocks-llm; other named peers are shown for reference only.
Compare QSI vs…
Frequently asked questions
What does Quantum-Si Inc (QSI) do?
Quantum-Si is a life sciences company developing single-molecule detection platforms for proteomics research. The company provides next-generation protein sequencing (NGPS) technology enabling researchers and clinicians to analyze the proteome (the full set of proteins in a cell) in a massively parallel fashion rather than sequentially.
What sector is Quantum-Si Inc (QSI) in?
Quantum-Si Inc (QSI) is classified in the Health Care sector. Its industry is Proteomics instrumentation and consumables. It trades on NASDAQ.
Who are Quantum-Si Inc's (QSI) competitors?
Notable peers of Quantum-Si Inc (QSI) include Thermo Fisher Scientific, Agilent Technologies, PerkinElmer, Waters Corporation and Shimadzu. This peer set is informational only — not financial advice.
Is Quantum-Si Inc (QSI) overbought or oversold right now?
Quantum-Si Inc (QSI) is currently neither overbought nor oversold — its 14-day RSI (a 0–100 momentum gauge) is 49, in the neutral middle (as of 2026-08-26). RSI describes recent price momentum, not a forecast — informational only, not financial advice.
Where does stocks-llm's data on QSI come from?
Fundamentals and prices come from market data, as of 2026-08-27; company filings and profile facts come from SEC EDGAR. All figures are delayed daily-close data shown with their as-of date — informational only, not financial advice.
Fundamentals: market data, as of 2026-08-27. Filings: SEC EDGAR. Prices are delayed daily-close data.
Last updated 2026-08-26.
Informational only — NOT financial advice. All figures are delayed daily-close data from SEC EDGAR & market data, shown with their as-of date.