NasdaqTechnologyMeasuring & Controlling Devices, NECBRANFORD, CT

Quantum-Si Incorporated QSI

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Estimated market cap $252.70M219.74M shares, shares as of Nov 3, 2026CIK 1816431

Insider trades, 12 mo

2 buys · 30 sells

$494.7K sold, open market

Congress trades, 24 mo

—

No disclosed trades

13F holders, Q3 2026

19.7% of shares · 19 added

13F holders

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Lobbying, 12 mo

—

No lobbying filings

Federal contracts, 12 mo

—

None matched

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Latest 10-Q

Q3 2026

What changed in Quantum-Si Incorporated's latest quarterly report, compared with the one before.

Filed Nov 5, 2026 · Quarter ended Sep 30, 2026

Compared with the 10-Q for the quarter ended Jun 30, 2026. Sections compared: management's discussion, risk factors, legal proceedings and controls and procedures.

Read the 10-Q on sec.gov ↗Filing index ↗

Latest 10-Q

What changed in Quantum-Si Incorporated's latest quarterly report, compared with the one before.

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Insider trades

32 in 12 mo

Open-market trades from Form 4. 10b5-1 marks a plan set in advance.

No open-market insider trades reported since Sep 22, 2026. Insiders have two business days to file.

Recent insider trades

Jeffrey Alan Hawkins President & CEO, Director	Sep 22 Form 4 ↗	Sale	−$7,379 9,709 sh @ $0.76	+49.0%
Christian LaPointe GC & Corp. Secretary	Sep 22 Form 4 ↗	Sale	−$3,588 4,721 sh @ $0.76	+49.0%
Jeffry R. Keyes Chief Financial Officer	Sep 22 Form 4 ↗	Sale	−$1,895 2,493 sh @ $0.76	+49.0%
Christian LaPointe GC & Corp. Secretary	Sep 21 Form 4 ↗	Sale	−$7,444 9,795 sh @ $0.76	+54.6%
Jeffry R. Keyes Chief Financial Officer	Sep 21 Form 4 ↗	Sale	−$3,931 5,172 sh @ $0.76	+54.6%

All QSI insider trades →Planned sales (Form 144): see notices

Insider trades

Open-market trades from Form 4. 10b5-1 marks a plan set in advance.

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13F holders

39.29M shares

83 funds report QSI. Values checked against market prices.

Funds own 27% of Class A shares (Q2 2026)

142 funds hold the Class A shares.

Q3 2026: 20% · 5,560 of ~8,900 funds reported so far

Q2 202627%
Q3 2026 (so far)20%

Q3 2026. 11 new, 19 added to, 30 trimmed, 70 exited since Q2 2026.

Top 13F holders
#
1	Vanguard Capital Management LLC 13F ↗	7.51M	$8.0M	-0.9%
2	ARK Investment Management LLC 13F ↗	7.39M	$7.9M	+3.1%
3	BlackRock, Inc. 13F ↗	4.79M	$5.1M	-8.3%
4	Sumitomo Mitsui Trust Group, Inc. 13F ↗	3.71M	$4.0M	-4.4%
5	Amova Asset Management Americas, Inc. 13F ↗	3.71M	$3.9M	-4.4%
6	Geode Capital Management, LLC 13F ↗	2.13M	$2.3M	-5.0%
7	UBS Group AG 13F ↗	1.35M	$1.4M	-47.2%
8	Renaissance Technologies LLC 13F ↗	1.20M	$1.3M	+116.0%
9	Vanguard Fiduciary Trust Co 13F ↗	1.12M	$1.2M	unchanged
10	State Street Corp 13F ↗	790,941	$846.3K	-11.2%

Download CSV Every fund that holds QSI, not only these ten. A download holds at most 10,000 rows; narrow the filters to get a smaller slice.

13F holders

Funds that report this stock, checked against market prices.

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Trades by members of Congress

Disclosed in dollar ranges, up to 45 days after the trade.

No recent congressional trades for this company.

Trades by members of Congress

Disclosed in dollar ranges, up to 45 days after the trade.

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Lobbying

What Quantum-Si Incorporated and its lobbying firms report each quarter.

No recent lobbying filings for this company.

Lobbying

What Quantum-Si Incorporated and its lobbying firms report each quarter.

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H-1B labor applications at Quantum-Si Incorporated

1 certified in 12 mo

Labor condition applications decided by the Department of Labor, matched to Quantum-Si Incorporated by employer name. An application is not a hire.

Median yearly wage offered, full-time certified applications, Jul 2025 to Jun 2026: —

H-1B labor applications decided at Quantum-Si Incorporated by quarter
Quarter	Certified	All decided	Workers asked for
2024 Q3	0	0	0
2024 Q4	0	0	0
2025 Q1	0	0	0
2025 Q2	2	2	2
2025 Q3	1	1	1
2025 Q4	0	0	0
2026 Q1	0	0	0
2026 Q2	0	0	0

Most common job titles at Quantum-Si Incorporated
Job title	Applications	Median wage
Senior Scientist, Biochemistry	1	—

All QSI applications

We match the employer's name to a public company automatically, including a reviewed list of subsidiaries. A subsidiary can be missed and a similar name can be matched wrongly. The files carry no worker names.

Institutional ownership over time

How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.

Funds holding the stock

Shares they report

Funds holding the stock by quarter

Q2 2021	72	—	44.42M	$534.9M
Q3 2021	73	+1	44.63M	$372.4M
Q4 2021	93	+20	47.24M	$371.4M
Q1 2022	92	-1	45.92M	$215.0M
Q2 2022	102	+10	48.65M	$139.6M
Q3 2022	102	0	47.62M	$130.9M
Q4 2022	105	+3	49.69M	$90.9M
Q1 2023	100	-5	43.52M	$76.5M
Q2 2023	91	-9	43.85M	$78.5M
Q3 2023	96	+5	54.53M	$90.5M
Q4 2023	91	-5	56.87M	$114.2M
Q1 2024	95	+4	53.45M	$105.1M
Q2 2024	99	+4	53.59M	$56.1M
Q3 2024	107	+8	52.06M	$45.9M
Q4 2024	121	+14	53.66M	$144.9M
Q1 2025	137	+16	57.80M	$69.3M
Q2 2025	135	-2	64.82M	$127.1M
Q3 2025	125	-10	64.73M	$91.7M
Q4 2025	136	+11	67.50M	$74.3M
Q1 2026	158	+22	63.12M	$49.0M
Q2 2026	142	-16	52.89M	$46.8M
Q3 2026	83	-59	39.29M	$42.0M

Each point is a quarter-end, from Q2 2021 to Q3 2026. A fund's 13F lists its long positions in US-listed securities as of the last day of the quarter and arrives up to 45 days later, so each point shows holdings at quarter-end, not on the day they were reported.

Common shares only; options and bonds are left out. When a fund amends a report, the amended version is the one counted.

The history follows the company's current CUSIP number (74765K105). If the company's shares were ever re-issued under a different CUSIP, the quarters before the change are not part of this series, so the first point (Q2 2021) can be later than the stock's first appearance in 13F reports.

Share counts are adjusted for stock splits; none took place between these quarters. Values are in dollars as reported at the time and are not adjusted.

A quarter appears once our daily update has built its summary. If a summary cannot be built, older reports are kept and the chart shows the quarters it has until the next update repairs it.

Institutional ownership over time

How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.

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More filings and data

Each opens the table.

Ownership stakes2 in 12 mo 8-K events4 in 90 days Patents38 patents granted Short interestFINRA · updated Oct 15 Planned insider salesForm 144 · 17 in 12 mo Executive payNone on record Wikipedia attentionNone on record SEC enforcementNone on record IPO history2 registrations Ownership stakes…8-K events…Patents…Short interest…Planned insider sales…Executive pay…Wikipedia attention…SEC enforcement…

About the company

The basics from the company’s SEC registration.

Legal name: Quantum-Si Inc
Address: 29 BUSINESS PARK DRIVE, BRANFORD, CT 06405
Phone: (203) 458-7100
Fiscal year ends: Dec 31
Filer category: Non-accelerated filer, smaller reporting company
Incorporated in: DE
Listed as: QSI (Nasdaq)
Former names: HighCape Capital Acquisition Corp. (until 2021)
SEC filings: All filings on SEC EDGAR ↗

About the company

The basics from the company’s SEC registration.

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$1.15−$0.07 (−5.74%) Nov 13 close

1M3M1Y

Oct 13, 2026Low $1.09 · High $1.75Nov 13, 2026

Aug 13, 2026Low $0.72 · High $1.75Nov 13, 2026

Nov 13, 2025Low $0.7023 · High $1.75Nov 13, 2026

Congress purchase Congress sale Insider sale over $1M

Adjusted for stock splits; not for dividends. Where prices come from.

Live chart

Intraday and historical prices from TradingView. Quotes may be delayed.

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Information, not investment advice. Company matching is automatic; check the source before relying on one row.