QSI

$0.79-$0.05 (-5.66%)prev close

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Held by

portfolios on TandT

Bookmarked by

users

Avg position size

—

of holders' portfolios

13F filers

institution

Market cap

$182.4M

218M shares

52-week range

$0.69 – $3.10

4% from low

Sector

MEASURING & CONTROLLING DEVICES, NEC

Exchange

NASDAQ

Change$-7.34

Analyst estimates (consensus)

Year	Est. revenue	Growth	Est. EPS	EPS range	Fwd P/E	# Analysts
2026	$1M	-62.5%	$-0.43	$-0.56–$-0.27	—	1
2027	$10M	+844.4%	$-0.40	$-0.51–$-0.25	—	1
2028	$28M	+191.0%	$-0.31	$-0.35–$-0.28	—	3
2029	$66M	+134.0%	$-0.21	$-0.27–$-0.13	—	1

Forward consensus · growth is YoY vs the prior fiscal-year estimate · Fwd P/E at the current price · source: Financial Modeling Prep

Earnings surprises

Beat consensus in 7 of the last 8 reported quarters

Reported	Est. EPS	Actual	Surprise
2026-08-13	$-0.11	$-0.11	+2.9%
2026-05-07	$-0.12	$-0.10	+16.7%
2026-03-03	$-0.14	$-0.08	+42.9%
2025-11-05	$-0.12	$-0.17	-41.7%
2025-08-05	$-0.16	$-0.16	+0.0%
2025-05-15	$-0.17	$-0.11	+35.3%
2025-03-03	$-0.18	$-0.18	+0.0%
2024-11-12	$-0.21

DCF fair valuemodel estimate

Intrinsic value

$0.10

Price

$0.79

Implied downside

-87%

Peer comparison

Symbol	Price	Today	Mkt cap	P/E
QSIQuantum-Si incorporated	$0.79	-5.66%	$156M	—
ADCTADC Therapeutics S.A.	$1.05	-14.63%	$134M	—
ALTAltimmune, Inc.	$2.88	-1.71%	$560M	—
ANNXAnnexon, Inc.	$5.26	-1.31%	$862M	—
AURAAura Biosciences, Inc.	$7.65	-1.29%

Quantum-Si Incorporated Class A Common Stock

Quantum-Si Inc is a life sciences company focused on proteomics research and analytical technologies. It develops single-molecule detection platforms designed to enable next-generation protein sequencing (NGPS) and large-scale protein analysis. Its technology supports massively parallel sequencing of proteins and can also be applied to the study of nucleic acids, providing tools for researchers and clinical applications in molecular analysis. The company's revenue is derived from sales of products and services.

www.quantum-si.com

Employees: 145
IPO / List date: Jun 11, 2021
HQ: BRANFORD, CT

Held by traders on TradeandTell

No one on the platform currently holds QSI.

Super investors & insiders

Institutions holding (13F)

Institution	Shares	Reported
Renaissance Technologiesas of 2026-03-31	117,900	$91.3K

Insider activity (SEC Form 4)

Click to see transaction details on SEC.gov. Form 4s cover trades by officers, directors, and 10%+ owners, due within 2 business days of the trade.

Insider activity (SEC Form 4)

Recent trades on TradeandTell

No one on the platform has traded QSI yet.

$QSI chatter on StockTwits

Eugenijus Visockas@Agge11Bullish4h
$QSI https://finance.yahoo.com/healthcare/articles/quantum-si-q2-earnings-call-030402584.html
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Flobus@TheGlobe3000Bullish8h
$QSI No obligatory cat tonight. Let me bring out the cookie monster cause I am going to stuff my face with QSI shares until I choke on it!
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Tony@GoldenKnightsFanBullish9h
$QSI I think QSI may be making the necessary changes and optimizations to Proteus to meet the requirements of a potential acquirer, with the ultimate goal of selling the company rather than launching the product independently. Of course, they couldn’t publicly say that while negotiations are taking place behind closed doors. This theory becomes even more interesting when you factor in the 20% workforce reduction they announced. Cutting the workforce while preparing to launch an entirely new product doesn’t exactly sound like a company gearing up for a major commercial rollout. And there’s still been no word on who purchased those 30 million shares in July 2025. Maybe just a wishful thinking on my part. I think this conference call was designed to demoralize retail investors,and they succeeded!
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Tu Blue@Abbie129h
$QSI I'm afraid of this getting delisted or reverse split. Since this Proteus will launch next year and this is my fear factor. If they could stay above 1$ it would be great.
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Tony@GoldenKnightsFanBullish9h
$QSI Even if QSI launches Proteus in Q2 2027 as they’ve indicated, it could still take another 2–3 quarters before we see meaningful orders from potential customers and gain real visibility into future revenue. By then, a reverse split may already be necessary to avoid delisting. And an RS could seriously damage the company and investor sentiment. For some reason, I think they are fine- tunning Proteus to meet a customer's requirements, even though hawkins denied that and stated that they are making these changes in Proteus due to their internal analysis and not due to customers demanding it. He ruled out that last point twice when he was asked, as if he was trying to say, there is nothing to see here. Which makes me more suspicious. Then, you have 20% reduction in workforce... that does sound like a company preparing to launch a new product to the market. This conference call was designed to destroy retail investors sentiment. They sure succeeded in that.
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OJ@mxli_58119h
Decision made. 🎯 Selling $QSI and moving into $KRKNF.
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Stocktwits Earnings@StocktwitsEarnings9h
$QSI Q2 '26 Earnings Results & Recap • Reported GAAP EPS of -$0.11 up 31.25% YoY • Reported revenue of $0.34M down -41.79% YoY
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Sab@Sabo759h
$QSI it so cheap right now. What are you people waiting for.
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beauadire sorryy@senoussiBullish9h
$QSI
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Morty752@Morty7529h
$QSI Like what I said!
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Tony@GoldenKnightsFanBullish10h
$QSI I am surprised that this isn't down 10-15% now. Dead money for the next 9 months.
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Michael Petrea@BuytheFear29Bullish10h
$QSI they have solid institutional ownership
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Mark Hogue@dachshund36Bullish11h
$QSI I think there are some very positive developments. Hoping there will be an investor presentation pdf and a YouTube video on these details.
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Akhedr1@Akhedr111h
$QSI Can’t see a single positive thing in this release. Totally disappointing.
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Hon Wen Hao@2255dfr11h
$QSI
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