Institutional HoldersBeta

Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

Quantum-Si Inc

CIK 0001816431QSI· quarter ending 2026-06-30

Shares outstanding

218,883,912

as of 2026-08-11 · 10-Q cover page, filed 2026-08-13

Held by 13F filers

52,890,858

26.6% of Common Class A

Holders

141

-16 vs 2026-03-31 · 27 new, 43 exited

Value

$46.8M

shares -16.2% vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-13, as of 2026-08-11)

Class	Listed	Shares outstanding	Held by 13F filers	% of class	Holders	CUSIP
Common Class A	QSI · NASDAQ	198,946,412	52,890,858	26.6%	141	74765K105
Common Class B	not listed	19,937,500	—	—

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine

Count	CUSIP	Class (as filers write it)	Holders	Shares held	Class shares	% of class	Value	Options	Mapped via
	74765K105	COM CL A	141	52,890,858	198,946,412	26.6%	$46.8M	3 call / 3 put	13DG	holders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings. 1 further CUSIPs map to this company (mostly bonds) but no 13F filer held them this quarter.

Top holders (141 of 141 · 74765K105)

change vs 2026-03-31

#	Filer	Shares	% of class	Value	Change
1	VANGUARD CAPITAL MANAGEMENT LLC	7,578,208	3.81%	$6.7M	+556,301 (+7.9%)
2	ARK Investment Management LLC	7,167,738	3.60%	$6.3M	+288,839 (+4.2%)
3	BlackRock, Inc.	5,225,352	2.63%	$4.6M	-8,189,597 (-61.0%)
4	Sumitomo Mitsui Trust Group, Inc.	3,885,230	1.95%	$3.4M	-506,436 (-11.5%)
5	Amova Asset Management Americas, Inc.	3,885,230	1.95%	$3.5M	-506,436 (-11.5%)
6	MILLENNIUM MANAGEMENT LLC	3,131,726	1.57%	$2.8M	NEW
7	UBS Group AG	2,561,897	1.29%	$2.3M	+859,370 (+50.5%)
8	AQR CAPITAL MANAGEMENT LLC	2,348,665	1.18%	$2.1M	-43,514 (-1.8%)
9	GEODE CAPITAL MANAGEMENT, LLC	2,236,526	1.12%	$2.0M	-1,598,595 (-41.7%)
10	JANE STREET GROUP, LLC	2,142,735	1.08%	$1.9M	NEW
11	SUSQUEHANNA INTERNATIONAL GROUP, LLP	1,116,750	0.56%	$988K	-347,818 (-23.7%)
12	VANGUARD FIDUCIARY TRUST CO	1,116,683	0.56%	$988K	-569 (-0.1%)
13	STATE STREET CORP	890,741	0.45%	$788K	-2,879,948 (-76.4%)
14	Fosun International Ltd	743,935	0.37%	$658K	—
15	RENAISSANCE TECHNOLOGIES LLC	553,871	0.28%	$490K	+435,971 (+369.8%)
16	VANGUARD PORTFOLIO MANAGEMENT LLC	497,098	0.25%	$440K	-1,023,548 (-67.3%)
17	GOLDMAN SACHS GROUP INC	476,288	0.24%	$422K	+32,111 (+7.2%)
18	NORTHERN TRUST CORP	450,531	0.23%	$399K	-810,170 (-64.3%)
19	Invesco Ltd.	443,929	0.22%	$393K	+37,239 (+9.2%)
20	BNP PARIBAS FINANCIAL MARKETS	398,598	0.20%	$353K	+360,208 (+938.3%)
21	IEQ CAPITAL, LLC	350,816	0.18%	$310K	-6,872 (-1.9%)
22	Aster Capital Management (DIFC) Ltd	344,510	0.17%	$305K	NEW
23	MORGAN STANLEY	323,482	0.16%	$286K	+193,542 (+148.9%)
24	IQ EQ FUND MANAGEMENT (IRELAND) Ltd	321,134	0.16%	$284K	+29,027 (+9.9%)
25	Knollwood Investment Advisory, LLC	300,000	0.15%	$266K	—
26	IMC-Chicago, LLC	285,758	0.14%	$253K	+64,882 (+29.4%)
27	BRIDGEWAY CAPITAL MANAGEMENT, LLC	206,100	0.10%	$182K	-55,000 (-21.1%)
28	BARCLAYS PLC	205,690	0.10%	$182K	+166,553 (+425.6%)
29	XTX Topco Ltd	177,680	0.09%	$157K	-211,574 (-54.4%)
30	SIMPLEX TRADING, LLC	165,293	0.08%	$146K	+74,762 (+82.6%)
31	Verdence Capital Advisors LLC	158,305	0.08%	$140K	-45,550 (-22.3%)
32	Mariner, LLC	157,689	0.08%	$140K	-42,003 (-21.0%)
33	Shay Capital LLC	150,922	0.08%	$134K	—
34	FMR LLC	123,767	0.06%	$110K	+91,799 (+287.2%)
35	GROUP ONE TRADING LLC	107,473	0.05%	$95K	-176,508 (-62.2%)
36	JONES FINANCIAL COMPANIES LLLP	100,483	0.05%	$86K	-9,417 (-8.6%)
37	HRT FINANCIAL LP	93,647	0.05%	$82K	NEW
38	AlphaCore Capital LLC	89,368	0.04%	$79K	-39,081 (-30.4%)
39	Cerity Partners LLC	85,347	0.04%	$76K	+4,697 (+5.8%)
40	Vanguard Global Advisers, LLC	84,757	0.04%	$75K	—
41	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	84,612	0.04%	$75K	-372,959 (-81.5%)
42	Y-Intercept (Hong Kong) Ltd	79,089	0.04%	$70K	NEW
43	JTC Employer Solutions Trustee Ltd	77,787	0.04%	$69K	+43,247 (+125.2%)
44	MERCER GLOBAL ADVISORS INC /ADV	77,277	0.04%	$68K	+22,082 (+40.0%)
45	RHUMBLINE ADVISERS	75,989	0.04%	$67K	-117,079 (-60.6%)
46	WINTON GROUP Ltd	75,800	0.04%	$67K	NEW
47	Cambridge Investment Research Advisors, Inc.	75,618	0.04%	$66K	+33,809 (+80.9%)
48	CAPTRUST FINANCIAL ADVISORS	73,128	0.04%	$65K	+4,092 (+5.9%)
49	HOLLENCREST CAPITAL MANAGEMENT	65,011	0.03%	$58K	+24,900 (+62.1%)
50	WEALTH ENHANCEMENT ADVISORY SERVICES, LLC	63,435	0.03%	$45K	-26,101 (-29.2%)
51	GSA CAPITAL PARTNERS LLP	60,011	0.03%	$53K	NEW
52	BANK OF AMERICA CORP /DE/	59,585	0.03%	$53K	-102,402 (-63.2%)
53	Creative Planning	55,884	0.03%	$49K	+3,336 (+6.3%)
54	Atom Investors LP	51,554	0.03%	$46K	NEW
55	Green Alpha Advisors, LLC	45,921	0.02%	$41K	+2,713 (+6.3%)
56	CITADEL ADVISORS LLC	44,335	0.02%	$39K	+28,789 (+185.2%)
57	Sanctuary Advisors, LLC	41,397	0.02%	$37K	-1,427 (-3.3%)
58	Stratos Wealth Advisors, LLC	40,036	0.02%	$35K	+25,000 (+166.3%)
59	Point72 Asset Management, L.P.	39,133	0.02%	$35K	NEW
60	BRIGHTON JONES LLC	38,585	0.02%	$34K	+11,025 (+40.0%)
61	Corient Private Wealth LP	38,328	0.02%	$34K	NEW
62	Red Wave Investments LLC	37,000	0.02%	$33K	—
63	Arax Advisory Partners	36,790	0.02%	$33K	+35,426 (+2597.2%)
64	SBI Securities Co., Ltd.	33,009	0.02%	$29K	+876 (+2.7%)
65	China Universal Asset Management Co., Ltd.	31,484	0.02%	$28K	-3,218 (-9.3%)
66	Kovack Advisors, Inc.	31,000	0.02%	$27K	+1,000 (+3.3%)
67	IPG Investment Advisors LLC	30,864	0.02%	$27K	NEW
68	Nuveen, LLC	30,077	0.02%	$27K	-421,290 (-93.3%)
69	Northern Lights Advisors, Inc.	29,989	0.02%	$27K	—
70	COMMONWEALTH EQUITY SERVICES, LLC	27,100	0.01%	$24K	-2,692 (-9.0%)
71	Wealth Management Associates, Inc.	26,350	0.01%	$23K	-600 (-2.2%)
72	Tower Research Capital LLC (TRC)	23,758	0.01%	$21K	-1,185 (-4.8%)
73	Merit Financial Group, LLC	23,616	0.01%	$21K	-12,731 (-35.0%)
74	Pallas Capital Advisors LLC	23,320	0.01%	$21K	-2,437 (-9.5%)
75	Leonteq Securities AG	22,500	0.01%	$20K	-2,500 (-10.0%)
76	HBW ADVISORY SERVICES LLC	22,292	0.01%	$20K	-405 (-1.8%)
77	NEUBERGER BERMAN GROUP LLC	21,766	0.01%	$19K	NEW
78	LPL Financial LLC	20,985	0.01%	$19K	-1,482 (-6.6%)
79	Vanguard Personalized Indexing Management, LLC	20,350	0.01%	$18K	-3,641 (-15.2%)
80	Capital Investment Advisory Services, LLC	20,000	0.01%	$18K	—
81	VICTORY CAPITAL MANAGEMENT INC	19,630	0.01%	$17K	-178 (-0.9%)
82	DLK Investment Management, LLC	19,000	0.01%	$20K	+2,250 (+13.4%)
83	ANCHYRA PARTNERS LLC	18,974	0.01%	$17K	NEW
84	Bank of New York Mellon Corp	18,805	0.01%	$17K	-364,283 (-95.1%)
85	SG Americas Securities, LLC	17,505	0.01%	$15K	-16,172 (-48.0%)
86	Focus Partners Wealth	17,219	0.01%	$15K	-6,298 (-26.8%)
87	JPMORGAN CHASE & CO	17,071	0.01%	$15K	-66,448 (-79.6%)
88	Flagship Private Wealth, LLC	14,158	0.01%	$13K	—
89	Procyon Advisors, LLC	13,671	0.01%	$12K	—
90	Balyasny Asset Management L.P.	13,629	0.01%	$12K	NEW
91	RAYMOND JAMES FINANCIAL INC	13,008	0.01%	$12K	NEW
92	Laurion Capital Management LP	12,749	0.01%	$11K	NEW
93	Callan Family Office, LLC	12,119	0.01%	$11K	NEW
94	Jefferies Financial Group Inc.	11,350	0.01%	$10K	NEW
95	Integrated Wealth Concepts LLC	11,333	0.01%	$10K	-3,166 (-21.8%)
96	NorthCrest Asset Manangement, LLC	11,218	0.01%	$11K	-926 (-7.6%)
97	NewEdge Advisors, LLC	11,168	0.01%	$10K	-4,652 (-29.4%)
98	Abel Hall, LLC	11,060	0.01%	$10K	NEW
99	Krilogy Financial LLC	10,635	0.01%	$9K	-6,094 (-36.4%)
100	Schonfeld Strategic Advisors LLC	10,439	0.01%	$9K	NEW
101	Cresset Asset Management, LLC	10,207	0.01%	$9K	—
102	Apollon Wealth Management, LLC	10,056	0.01%	$9K	NEW
103	Glen Eagle Advisors, LLC	10,000	0.01%	$9K	—
104	Verde Capital Management	10,000	0.01%	$9K	NEW
105	KESTRA PRIVATE WEALTH SERVICES, LLC	10,000	0.01%	$9K	—
106	RED REEF ADVISORS LLC	10,000	0.01%	$9K	—
107	Mirae Asset Global Investments Co., Ltd.	8,847	0.00%	$8K	-1,353 (-13.3%)
108	ROYAL BANK OF CANADA	8,465	0.00%	$7K	+8,356 (+7666.1%)
109	OSAIC HOLDINGS, INC.	7,813	0.00%	$7K	-157 (-2.0%)
110	Russell Investments Group, Ltd.	7,551	0.00%	$7K	-4,297 (-36.3%)
111	EverSource Wealth Advisors, LLC	5,417	0.00%	$5K	-38 (-0.7%)
112	Allworth Financial LP	4,814	0.00%	$4K	-2,015 (-29.5%)
113	CITIGROUP INC	4,659	0.00%	$4K	-8,655 (-65.0%)
114	GF FUND MANAGEMENT CO. LTD.	4,185	0.00%	$4K	+462 (+12.4%)
115	MTM Investment Management, LLC	4,125	0.00%	$4K	—
116	FNY Investment Advisers, LLC	4,000	0.00%	$3K	—
117	Archer Investment Corp	4,000	0.00%	$4K	+2,000 (+100.0%)
118	N.E.W. Advisory Services LLC	3,854	0.00%	$3K	—
119	PINNEY & SCOFIELD, INC.	3,680	0.00%	$3K	—
120	Essential Partners LLC	3,094	0.00%	$3K	-12,342 (-80.0%)
121	IFP Advisors, Inc	2,020	0.00%	$2K	-81 (-3.9%)
122	Steward Partners Investment Advisory, LLC	2,000	0.00%	$2K	—
123	ROTHSCHILD INVESTMENT LLC	1,436	0.00%	$1K	-252 (-14.9%)
124	GAMMA Investing LLC	1,373	0.00%	$1K	-457 (-25.0%)
125	Fortitude Family Office, LLC	1,245	0.00%	$1K	NEW
126	Farther Finance Advisors, LLC	959	0.00%	$849	-375 (-28.1%)
127	True Wealth Design, LLC	720	0.00%	$638	+213 (+42.0%)
128	Rialto Wealth Management, LLC	562	0.00%	$498	+53 (+10.4%)
129	Bangor Savings Bank	500	0.00%	$443	+395 (+376.2%)
130	Larson Financial Group LLC	300	0.00%	$266	NEW
131	TD Waterhouse Canada Inc.	300	0.00%	$276	—
132	HARBOUR INVESTMENTS, INC.	299	0.00%	$265	+49 (+19.6%)
133	Medallion Wealth Advisors, LLC	242	0.00%	$213	-228 (-48.5%)
134	GILL CAPITAL PARTNERS, LLC	200	0.00%	$177	—
135	SJS Investment Consulting Inc.	185	0.00%	$164	+66 (+55.5%)
136	Transamerica Financial Advisors, LLC	132	0.00%	$116	NEW
137	Clearstead Advisors, LLC	53	0.00%	$47	NEW
138	Federation des caisses Desjardins du Quebec	50	0.00%	$44	—
139	Optiver Holding B.V.	30	0.00%	$27	-776 (-96.3%)
140	JPL Wealth Management, LLC	26	0.00%	$24	NEW
141	Caitong International Asset Management Co., Ltd	1	0.00%	$1	-304 (-99.7%)

Exited since 2026-03-31 (43 filers; largest 25 shown)

ALLIANCEBERNSTEIN L.P.	−272,180
CIBC Bancorp USA Inc.	−208,510
CWM, LLC	−126,632
DEUTSCHE BANK AG\	−119,028
LOS ANGELES CAPITAL MANAGEMENT LLC	−116,341
MetLife Investment Management, LLC	−101,555
PRICE T ROWE ASSOCIATES INC /MD/	−96,486
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	−74,928
Virtu Financial LLC	−64,751
WELLS FARGO & COMPANY/MN	−63,868
Quantbot Technologies LP	−58,461
TWO SIGMA INVESTMENTS, LP	−52,924
MANUFACTURERS LIFE INSURANCE COMPANY, THE	−47,453
INTECH INVESTMENT MANAGEMENT LLC	−46,486
Police & Firemen's Retirement System of New Jersey	−46,170
STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM	−41,282
NINE MASTS CAPITAL Ltd	−41,134
ProShare Advisors LLC	−33,239
SEI INVESTMENTS CO	−33,103
VOYA INVESTMENT MANAGEMENT LLC	−27,246
NEW YORK STATE COMMON RETIREMENT FUND	−26,084
PRUDENTIAL FINANCIAL INC	−21,570
Focus Partners Advisor Solutions, LLC	−16,473
Ameritas Investment Partners, Inc.	−14,401
XPONANCE LLC	−13,849

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting person	Form	Filed	Event	Shares	% of class
ROTHBERG JONATHAN M	SCHEDULE 13D/A	2026-08-28	2026-08-26	14,376,415	7.2%
23rd Century Capital LLC	SCHEDULE 13D/A	2026-08-28	2026-08-26	1,917,067	0.96%
4C Holdings I, LLC	SCHEDULE 13D/A	2026-08-28	2026-08-26	17,943,750	90%
4C Holdings V, LLC	SCHEDULE 13D/A	2026-08-28	2026-08-26	1,993,750	10%
ROTHBERG JONATHAN M.	SCHEDULE 13D/A	2026-08-28	2026-08-26	19,937,500	100%
BlackRock, Inc.	SCHEDULE 13G/A	2026-07-29	2026-06-30	4,598,208	2.3%
The Vanguard Group	SCHEDULE 13G/A	2025-10-30	2025-09-30	8,714,507	4.77%
2012 JMR Trust Common, LLC	SCHEDULE 13D/A	2025-09-11	2025-09-09	—	0%
ARK Investment Management LLC	SCHEDULE 13G/A	2025-06-06	2025-05-31	7,809,337	4.77%
Catherine D. Wood	SCHEDULE 13G/A	2025-06-06	2025-05-31	7,809,337	4.77%
Nikko Asset Management Americas, Inc.	SCHEDULE 13G/A	2025-02-13	2024-12-31	5,965,208	4.85%
Nikko Asset Management Co., Ltd.	SCHEDULE 13G/A	2025-02-04	2024-12-31	5,965,208	4.8%
Sumitomo Mitsui Trust Group, Inc.	SCHEDULE 13G/A	2025-02-04	2024-12-31	5,965,208	4.8%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.