Quantum-Si Inc (QSI) — Institutional Holders, Q2 2026

141 institutional investment managers reported a QSI position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $46.8M. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.

← QSI stock profile

QSI in Q2 2026: what funds did

Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.

New positions

Added to

Trimmed

Sold out

Biggest buyers

MILLENNIUM MANAGEMENTNew · +3,131,726 sh+$2.8M
JANE STREET GROUPNew · +2,142,735 sh+$1.9M
UBS Group AGAdded · +859,370 sh+$760.5K
VANGUARD CAPITAL MANAGEMENTAdded · +556,301 sh+$492.3K
RENAISSANCE TECHNOLOGIESAdded · +435,971 sh+$385.8K

Biggest sellers

BlackRockTrimmed · -8,189,597 sh-$7.2M
STATE STREETTrimmed · -2,879,948 sh-$2.5M
GEODE CAPITAL MANAGEMENTTrimmed · -1,598,595 sh-$1.4M
VANGUARD PORTFOLIO MANAGEMENTTrimmed · -1,023,548 sh-$905.8K
NORTHERNTrimmed · -810,170 sh-$717.0K

QSI 13F holders ranked 1–100 of 141

Institutional investors reporting a position in Quantum-Si Inc on SEC Form 13F-HR for Q2 2026, ranked by reported value.
#	Institution	Shares	Value	% of portfolio	QoQShares vs Q1 2026
1	VANGUARD CAPITAL MANAGEMENT#1 · 7,578,208 sh	7,578,208	$6.7M	<0.01%	+7.9%
2	ARK Investment Management#2 · 7,167,738 sh	7,167,738	$6.3M	0.04%	+4.2%
3	BlackRock#3 · 5,225,352 sh	5,225,352	$4.6M	<0.01%	-61.0%
4	Nikko Asset Management Americas#4 · 3,885,230 sh	3,885,230	$3.5M	0.04%	-11.5%
5	Sumitomo Mitsui#5 · 3,885,230 sh	3,885,230	$3.4M	<0.01%	-11.5%
6	MILLENNIUM MANAGEMENT#6 · 3,131,726 sh	3,131,726	$2.8M	<0.01%	New
7	UBS Group AG#7 · 2,561,897 sh	2,561,897	$2.3M	<0.01%	+50.3%
8	AQR CAPITAL MANAGEMENT#8 · 2,348,665 sh	2,348,665	$2.1M	<0.01%	-1.8%
9	GEODE CAPITAL MANAGEMENT#9 · 2,236,526 sh	2,236,526	$2.0M	<0.01%	-41.7%
10	JANE STREET GROUP#10 · 2,142,735 sh	2,142,735	$1.9M	<0.01%	New
11	SUSQUEHANNA INTERNATIONAL GROUP, LLP#11 · 1,116,750 sh	1,116,750	$988.3K	<0.01%	-27.9%
12	VANGUARD FIDUCIARY#12 · 1,116,683 sh	1,116,683	$988.3K	<0.01%	-0.1%
13	STATE STREET#13 · 890,741 sh	890,741	$788.3K	0.00%	-76.4%
14	Fosun International Ltd#14 · 743,935 sh	743,935	$658.4K	0.15%	0.0%
15	RENAISSANCE TECHNOLOGIES#15 · 553,871 sh	553,871	$490.2K	<0.01%	+369.8%
16	VANGUARD PORTFOLIO MANAGEMENT#16 · 497,098 sh	497,098	$439.9K	0.00%	-67.3%
17	GOLDMAN SACHS GROUP#17 · 476,288 sh	476,288	$421.5K	0.00%	+7.2%
18	NORTHERN#18 · 450,531 sh	450,531	$398.7K	0.00%	-64.3%
19	Invesco Ltd.#19 · 443,929 sh	443,929	$392.9K	0.00%	+9.2%
20	BNP PARIBAS FINANCIAL MARKETS#20 · 398,598 sh	398,598	$352.8K	<0.01%	+938.3%
21	IEQ CAPITAL#21 · 350,816 sh	350,816	$310.5K	<0.01%	-1.9%
22	Aster Capital Management (DIFC) Ltd#22 · 344,510 sh	344,510	$304.9K	0.06%	New
23	MORGAN STANLEY#23 · 323,482 sh	323,482	$286.3K	0.00%	+148.9%
24	IQ EQ FUND MANAGEMENT (IRELAND) Ltd#24 · 321,134 sh	321,134	$284.2K	0.02%	+9.9%
25	Knollwood Investment Advisory#25 · 300,000 sh	300,000	$265.5K	0.02%	0.0%
26	IMC-Chicago#26 · 285,758 sh	285,758	$252.9K	<0.01%	+29.4%
27	BRIDGEWAY CAPITAL MANAGEMENT#27 · 206,100 sh	206,100	$182.4K	<0.01%	-21.1%
28	BARCLAYS PLC#28 · 205,690 sh	205,690	$182.0K	0.00%	+425.6%
29	XTX Topco Ltd#29 · 177,680 sh	177,680	$157.2K	<0.01%	-54.4%
30	SIMPLEX TRADING#30 · 165,293 sh	165,293	$146.3K	<0.01%	+82.6%
31	Verdence Capital Advisors#31 · 158,305 sh	158,305	$140.1K	—	-22.3%
32	Mariner#32 · 157,689 sh	157,689	$139.6K	<0.01%	-21.0%
33	Shay Capital#33 · 150,922 sh	150,922	$133.6K	<0.01%	0.0%
34	FMR#34 · 123,767 sh	123,767	$109.5K	0.00%	+287.2%
35	GROUP ONE TRADING, L.P.#35 · 107,473 sh	107,473	$95.1K	<0.01%	-62.2%
36	JONES FINANCIAL COMPANIES LLLP#36 · 100,483 sh	100,483	$85.8K	0.00%	-8.6%
37	AlphaCore Capital#37 · 89,493 sh	89,493	$83.2K	<0.01%	-30.3%
38	HRT FINANCIAL#38 · 93,647 sh	93,647	$82.0K	<0.01%	New
39	Cerity Partners#39 · 85,347 sh	85,347	$75.5K	<0.01%	+5.8%
40	Vanguard Global Advisers#40 · 84,757 sh	84,757	$75.0K	0.00%	0.0%
41	CHARLES SCHWAB INVESTMENT MANAGEMENT#41 · 84,612 sh	84,612	$74.9K	0.00%	-81.5%
42	Y-Intercept (Hong Kong) Ltd#42 · 79,089 sh	79,089	$70.0K	—	New
43	JTC Employer Solutions Trusteee Ltd#43 · 77,787 sh	77,787	$69.0K	<0.01%	+125.2%
44	MERCER GLOBAL ADVISORS#44 · 77,277 sh	77,277	$68.4K	<0.01%	+40.0%
45	RHUMBLINE ADVISERS#45 · 75,989 sh	75,989	$67.2K	<0.01%	-60.6%
46	WINTON GROUP Ltd#46 · 75,800 sh	75,800	$67.1K	<0.01%	New
47	CAPTRUST FINANCIAL ADVISORS#47 · 73,128 sh	73,128	$64.7K	<0.01%	+5.9%
48	HOLLENCREST SECURITIES#48 · 65,011 sh	65,011	$57.5K	<0.01%	+62.1%
49	GSA CAPITAL PARTNERS LLP#49 · 60,011 sh	60,011	$53.0K	<0.01%	New
50	BANK OF AMERICA#50 · 59,585 sh	59,585	$52.7K	0.00%	-63.2%
51	Creative Planning#51 · 55,884 sh	55,884	$49.5K	0.00%	+6.3%
52	Atom Investors#52 · 51,554 sh	51,554	$45.6K	<0.01%	New
53	WEALTH ENHANCEMENT ADVISORY SERVICES#53 · 63,435 sh	63,435	$45.2K	—	-29.2%
54	Green Alpha Advisors#54 · 45,921 sh	45,921	$40.6K	—	+6.3%
55	CITADEL ADVISORS#55 · 44,335 sh	44,335	$39.2K	0.00%	+185.2%
56	Sanctuary Advisors#56 · 41,397 sh	41,397	$36.6K	<0.01%	-3.3%
57	Stratos Wealth Advisors#57 · 40,036 sh	40,036	$35.4K	<0.01%	+166.3%
58	Point72 Asset Management, L.P.#58 · 39,133 sh	39,133	$34.6K	0.00%	New
59	BRIGHTON JONES#59 · 38,585 sh	38,585	$34.1K	<0.01%	+40.0%
60	Corient Private Wealth#60 · 38,328 sh	38,328	$33.9K	0.00%	New
61	Cambridge Investment Research Advisors#61 · 37,809 sh	37,809	$33.0K	<0.01%	-9.6%
62	Red Wave Investments#62 · 37,000 sh	37,000	$32.7K	<0.01%	0.0%
63	SRS Capital Advisors#63 · 36,790 sh	36,790	$32.6K	<0.01%	+2597.2%
64	SBI Securities , Ltd.#64 · 33,009 sh	33,009	$29.2K	—	+2.7%
65	China Universal Asset Management , Ltd.#65 · 31,484 sh	31,484	$27.9K	<0.01%	-9.3%
66	Kovack Advisors#66 · 31,000 sh	31,000	$27.4K	<0.01%	+3.3%
67	IPG Investment Advisors#67 · 30,864 sh	30,864	$27.3K	<0.01%	New
68	Nuveen#68 · 30,077 sh	30,077	$26.6K	0.00%	-93.3%
69	Northern Lights Advisors#69 · 29,989 sh	29,989	$26.5K	—	0.0%
70	COMMONWEALTH EQUITY SERVICES#70 · 27,100 sh	27,100	$24.0K	0.00%	-9.0%
71	Wealth Management Associates#71 · 26,350 sh	26,350	$23.3K	<0.01%	-2.2%
72	Tower Research Capital (TRC)#72 · 23,758 sh	23,758	$21.0K	<0.01%	-4.8%
73	Merit Financial Group#73 · 23,616 sh	23,616	$20.9K	<0.01%	-35.0%
74	Pallas Capital Advisors#74 · 23,320 sh	23,320	$20.6K	<0.01%	-9.5%
75	DLK Investment Management#75 · 19,000 sh	19,000	$19.9K	—	+13.4%
76	Leonteq Securities AG#76 · 22,500 sh	22,500	$19.9K	<0.01%	-10.0%
77	HBW Advisory Services#77 · 22,292 sh	22,292	$19.7K	—	-1.8%
78	Neuberger Berman Group#78 · 21,766 sh	21,766	$19.3K	0.00%	New
79	LPL Financial#79 · 20,985 sh	20,985	$18.6K	0.00%	-6.6%
80	Vanguard Personalized Indexing Management#80 · 20,350 sh	20,350	$18.0K	<0.01%	-15.2%
81	Capital Investment Advisory Services#81 · 20,000 sh	20,000	$17.7K	<0.01%	0.0%
82	VICTORY CAPITAL MANAGEMENT#82 · 19,630 sh	19,630	$17.4K	0.00%	-0.9%
83	ANCHYRA PARTNERS#83 · 18,974 sh	18,974	$16.8K	—	New
84	Bank of New York Mellon#84 · 18,805 sh	18,805	$16.6K	0.00%	-95.1%
85	Focus Partners Wealth#85 · 17,219 sh	17,219	$15.2K	0.00%	-26.8%
86	JPMORGAN CHASE#86 · 17,071 sh	17,071	$15.2K	0.00%	-79.6%
87	SG Americas Securities#87 · 17,505 sh	17,505	$15.0K	0.00%	-48.0%
88	Flagship Private Wealth#88 · 14,158 sh	14,158	$12.5K	<0.01%	0.0%
89	Procyon Advisors#89 · 13,671 sh	13,671	$12.1K	—	0.0%
90	BALYASNY ASSET MANAGEMENT L.P.#90 · 13,629 sh	13,629	$12.1K	0.00%	New
91	RAYMOND JAMES FINANCIAL#91 · 13,008 sh	13,008	$11.5K	0.00%	New
92	Laurion Capital Management#92 · 12,749 sh	12,749	$11.3K	<0.01%	New
93	NorthCrest Asset Manangement#93 · 11,218 sh	11,218	$10.8K	—	-7.6%
94	Callan Family Office#94 · 12,119 sh	12,119	$10.7K	<0.01%	New
95	LEUCADIA NATIONAL#95 · 11,350 sh	11,350	$10.0K	<0.01%	New
96	Integrated Wealth Concepts#96 · 11,333 sh	11,333	$10.0K	0.00%	-21.8%
97	NewEdge Advisors#97 · 11,168 sh	11,168	$9.9K	0.00%	-29.4%
98	Abel Hall#98 · 11,060 sh	11,060	$9.8K	—	New
99	Krilogy Financial#99 · 10,635 sh	10,635	$9.4K	—	-36.4%
100	Schonfeld Strategic Advisors#100 · 10,439 sh	10,439	$9.2K	0.00%	New

Funds that sold out of QSI in Q2 2026 (41)

Held QSI at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.

Institutions that held QSI in Q1 2026 and reported no position in Q2 2026.
Institution	Shares sold	Value in Q1 2026
ALLIANCEBERNSTEIN L.P.272,180 sh	272,180	$299.4K
CIBC Bancorp USA208,510 sh	208,510	$161.4K
DEUTSCHE BANK AG\119,028 sh	119,028	$91.7K
LOS ANGELES CAPITAL MANAGEMENT116,341 sh	116,341	$90.0K
MetLife Investment Management101,555 sh	101,555	$78.6K
PRICE T ROWE ASSOCIATES96,486 sh	96,486	$75.0K
MIRAE ASSET GLOBAL ETFS Ltd.74,928 sh	74,928	$58.0K
Virtu Financial64,751 sh	64,751	$50.0K
WELLS FARGO & COMPANY63,868 sh	63,868	$49.4K
Quantbot Technologies58,461 sh	58,461	$45.2K
TWO SIGMA INVESTMENTS52,924 sh	52,924	$41.0K
MANUFACTURERS LIFE INSURANCE COMPANY, THE47,453 sh	47,453	$36.7K
INTECH INVESTMENT MANAGEMENT46,486 sh	46,486	$36.0K
Police & Firemen's Retirement System of New Jersey46,170 sh	46,170	$35.7K
STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM41,282 sh	41,282	$32.0K
NINE MASTS CAPITAL Ltd41,134 sh	41,134	$31.8K
ProShare Advisors33,239 sh	33,239	$25.7K
SEI INVESTMENTS33,103 sh	33,103	$25.6K
VOYA INVESTMENT MANAGEMENT27,246 sh	27,246	$21.1K
NEW YORK STATE COMMON RETIREMENT FUND26,084 sh	26,084	$20.2K
PRUDENTIAL FINANCIAL21,570 sh	21,570	$16.7K
Focus Partners Advisor Solutions16,473 sh	16,473	$12.8K
Ameritas Investment Partners14,401 sh	14,401	$11.1K
XPONANCE13,849 sh	13,849	$10.7K
Legal & General Group Plc12,860 sh	12,860	$10.0K
Graham Capital Management, L.P.12,220 sh	12,220	$9.5K
RMB Capital Management10,391 sh	10,391	$8.0K
Ground Swell Capital10,132 sh	10,132	$7.8K
WOLVERINE ASSET MANAGEMENT6,170 sh	6,170	$4.8K
Sterling Capital Management5,672 sh	5,672	$4.4K
Ronald Blue5,000 sh	5,000	$3.9K
Hanson & Doremus Investment Management1,300 sh	1,300	$1.0K
MAI Capital Management1,274 sh	1,274	$987.00
Sound Income Strategies1,000 sh	1,000	$748.00
Wealth Preservation Advisors549 sh	549	$425.00
Walleye Trading448 sh	448	$347.00
NISA INVESTMENT ADVISORS382 sh	382	$296.00
Walleye Capital312 sh	312	$241.00
Root Financial Partners292 sh	292	$226.00
Kilter Group4 sh	4	$4.00
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM8,500 sh	8,500	—

Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.