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QSI · Quantum-Si Inc · Holdings

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$1.18 +0.02 (+1.72%)
Rebalance outlook locked
Market Cap
$253.91M
Shares
218.88M
Volume · Oct 21 909.96K Avg daily vol (3M) 5.27M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP → See every holder of QSI: 13F, 13D and 13G, insiders and funds →
Institutional holdings are being reconciled with SEC filings. Holder totals and changes may be incomplete until reconciliation finishes.
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 132
Total Value: $47,510,062
Total Shares: 53,659,861
Showing 1–100 of 138 holdings by value · page 1 of 2

Institutional Ownership Trend

24 quarters

Holder Concentration

Across 141 13F filers
Top Holder
14.1%
Sep 2023 → Jun 2026 · range 14.1% – 27.3%
of institutional value
Top 5
51.5%
Sep 2023 → Jun 2026 · range 51.5% – 79.5%
of institutional value
Top 10
75.1%
Sep 2023 → Jun 2026 · range 75.1% – 90.8%
of institutional value
HHI
712
Sep 2023 → Jun 2026 · range 712 – 1,485
Broadly held

Who Holds QSI

Last 8 quarters through Sep 30, 2026 (filing window open)

Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.

Jun 30, 2026, the newest closed quarter: 141 filers, like-for-like change -16.1%; actively managed books +15.6%; index-like books -39.0%.

Holder type Share Filers Change
Registered adviser 56.6% 78 +0.4%
Exempt adviser 0.8% 2 +20.1%
Adviser 1.4% 2 +5.3%
Bank 15.3% 10 -31.7%
Broker-dealer 0.2% 2 -58.1%
Non-US 0.8% 2 +127.7%
Holding company 11.7% 7 -55.9%
Insurer 0.0% 0 -100.0%
Benefit plan 0.0% 0 -100.0%
Registered fund 0.0% 0 —
Unknown 13.2% 38 +22.2%

The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.

How the mix is measured

Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.

Excluded 2 holders with no observed 2026-06-30 13F.

Conviction and Crowding

141 13F filers, quarter ended Jun 30, 2026

Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.

Conviction holders
0
0.000% of filers hold it in their top 10
Mar 31, 2026: 0
Holders above 5%
0
median weight 0.000%
Mar 31, 2026: 0
Crowding
—
the issuer has more than one class of common stock, so its count is the total across classes
Private-fund advisers
—
of shares outstanding
Institutional ownership
—
the issuer has more than one class of common stock, so its count is the total across classes
Top 10 holders
76.0%
of 13F shares, Herfindahl 0.073
Active holders
+15.6%
like-for-like share change of active filers
5% stakes on record
2
1 13D, 1 13G (1 institutional, 0 passive, 0 exempt)
How long holders have held it value-weighted 11.7 quarters
Under 1 year 32.8% 1 to 3 years 18.6% 3 years or more 48.6% Since coverage start 0.000%

Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).

Estimated Holder Cost Basis

Quarter ended Jun 30, 2026, on that quarter's share basis

Estimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.

Estimated avg cost
$3.10
estimated per share
Mar 31, 2026: $3.36
Quarter-end price
$0.88
implied by 13F values
Estimated gain or loss
-71.5%
price against the estimated cost
Estimated at a loss
100.0%
of costed 13F value

Estimated cost covers 82.3% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.

Shared Holders

Companies QSI's active holders also own, quarter ended Jun 30, 2026
# Company Shared holders
1 IVZ Invesco Ltd. 5
2 NFLX Netflix Inc 5
3 MCD Mcdonalds Corp 5
4 AMAT Applied Materials Inc /De 5
5 AMZN Amazon Com Inc 7
6 MSFT Microsoft Corp 7
7 GOOGL Alphabet Inc. 7
8 WM Waste Management Inc 3
9 PANW Palo Alto Networks Inc 4
10 CRM Salesforce, Inc. 3

Shareholder Targets

13F filers that own its peers but not QSI, quarter ended Jun 30, 2026

Found through its holder-overlap peers: IVZ, NFLX, MCD, AMAT, AMZN, MSFT, GOOGL, WM, PANW, CRM, TSLA, COST, GS, NVDA, AAPL, V, INTC, BRK-B, META, GLW. 7,235 filers in all.

# Filer In peers
1 NORGES BANK Non-US, Index-like $340,872,551,742 20 held
2 PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser, Diversified active $316,191,796,450 20 held
3 Capital Research Global Investors Adviser, Diversified active $234,451,352,865 19 held
4 UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser, Index-like $189,980,313,812 20 held
5 Capital World Investors Adviser, Diversified active $188,852,371,175 16 held
6 Legal & General Group Plc Unknown, Index-like $161,571,045,644 20 held
7 Amundi Holding company, Index-like $138,489,455,752 20 held
8 WELLINGTON MANAGEMENT GROUP LLP Holding company, Diversified active $119,963,364,138 20 held
9 Capital International Investors Adviser, Diversified active $114,742,791,248 17 held
10 FRANKLIN RESOURCES INC Adviser, Diversified active $109,383,297,681 20 held

Fund Ownership of QSI by Fund Type

Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026

Index funds and index ETFs hold 7.18% of shares outstanding.

Fund type Of shares outstanding Shares
Index funds 2.14% 4,678,103
Index ETFs 5.05% 11,046,468
Active ETFs 3.17% 6,932,653
Active funds 0.15% 335,797
Unclassified 0.00% 0
All registered funds 10.50% 22,993,021
How fund types are measured

Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.

Holder type: Registered adviser 73 Exempt adviser 2 Adviser 2 Bank 10 Broker-dealer 2 Non-US 2 Holding company 7 Unknown 34
Showing 100 of 138
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
VANGUARD CAPITAL MANAGEMENT LLC $6,706,714 14.12% 7,578,208
ARK Investment Management LLC $6,343,448 13.35% 7,167,738
BlackRock, Inc. $4,624,433 9.73% 5,225,352
Sumitomo Mitsui Trust Group, Inc. $3,438,428 7.24% 3,885,230
Amova Asset Management Americas, Inc. $3,438,428 7.24% 3,885,230
MILLENNIUM MANAGEMENT LLC $2,771,577 5.83% 3,131,726
UBS Group AG $2,267,277 4.77% 2,561,897
AQR CAPITAL MANAGEMENT LLC $2,078,564 4.37% 2,348,665
GEODE CAPITAL MANAGEMENT, LLC $1,979,324 4.17% 2,236,526
JANE STREET GROUP, LLC $1,896,320 3.99% 2,142,735
SUSQUEHANNA INTERNATIONAL GROUP, LLP $988,323 2.08% 1,116,750
VANGUARD FIDUCIARY TRUST CO $988,264 2.08% 1,116,683
STATE STREET CORP $788,305 1.66% 890,741
Fosun International Ltd $658,382 1.39% 743,935
RENAISSANCE TECHNOLOGIES LLC $490,175 1.03% 553,871
VANGUARD PORTFOLIO MANAGEMENT LLC $439,931 0.93% 497,098
GOLDMAN SACHS GROUP INC $421,513 0.89% 476,288
NORTHERN TRUST CORP $398,719 0.84% 450,531
Invesco Ltd. $392,877 0.83% 443,929
BNP PARIBAS ARBITRAGE, SA $352,759 0.74% 398,598
IEQ CAPITAL, LLC $310,472 0.65% 350,816
Aster Capital Management (DIFC) Ltd $304,891 0.64% 344,510
MORGAN STANLEY $286,279 0.60% 323,482
IQ EQ FUND MANAGEMENT (IRELAND) Ltd $284,203 0.60% 321,134
Knollwood Investment Advisory, LLC $265,500 0.56% 300,000
IMC-Chicago, LLC $252,895 0.53% 285,758
SUSQUEHANNA INTERNATIONAL GROUP, LLP $219,922 0.46% 248,500
JANE STREET GROUP, LLC $218,860 0.46% 247,300
BRIDGEWAY CAPITAL MANAGEMENT, LLC $182,398 0.38% 206,100
BARCLAYS PLC $182,035 0.38% 205,690
CITADEL ADVISORS LLC $160,185 0.34% 181,000
XTX Topco Ltd $157,246 0.33% 177,680
SUSQUEHANNA INTERNATIONAL GROUP, LLP $152,397 0.32% 172,200
SIMPLEX TRADING, LLC $146,284 0.31% 165,293
Verdence Capital Advisors LLC $140,099 0.29% 158,305
Mariner, LLC $139,554 0.29% 157,689
Shay Capital LLC $133,565 0.28% 150,922
FMR LLC $109,532 0.23% 123,767
CITADEL ADVISORS LLC $95,226 0.20% 107,600
GROUP ONE TRADING LLC $95,113 0.20% 107,473
JONES FINANCIAL COMPANIES LLLP $88,927 0.19% 100,483
HRT FINANCIAL LP $82,877 0.17% 93,647
AlphaCore Capital LLC $79,090 0.17% 89,368
Cerity Partners LLC $75,531 0.16% 85,347
Vanguard Global Advisers, LLC $75,009 0.16% 84,757
CHARLES SCHWAB INVESTMENT MANAGEMENT INC $74,881 0.16% 84,612
JTC Employer Solutions Trustee Ltd $68,841 0.14% 77,787
MERCER GLOBAL ADVISORS INC /ADV $68,390 0.14% 77,277
RHUMBLINE ADVISERS $67,250 0.14% 75,989
WINTON GROUP Ltd $67,083 0.14% 75,800
CAPTRUST FINANCIAL ADVISORS $64,718 0.14% 73,128
HOLLENCREST CAPITAL MANAGEMENT $57,534 0.12% 65,011
GSA CAPITAL PARTNERS LLP $53,109 0.11% 60,011
BANK OF AMERICA CORP /DE/ $52,732 0.11% 59,585
Green Alpha Advisors, LLC $50,714 0.11% 47,397
Creative Planning $49,457 0.10% 55,884
Atom Investors LP $45,625 0.10% 51,554
CITADEL ADVISORS LLC $39,236 0.08% 44,335
Sanctuary Advisors, LLC $36,636 0.08% 41,397
Stratos Wealth Advisors, LLC $35,431 0.07% 40,036
Point72 Asset Management, L.P. $34,632 0.07% 39,133
BRIGHTON JONES LLC $34,147 0.07% 38,585
Corient Private Wealth LLC $33,920 0.07% 38,328
Cambridge Investment Research Advisors, Inc. $33,460 0.07% 37,809
Red Wave Investments LLC $32,745 0.07% 37,000
Arax Advisory Partners $32,559 0.07% 36,790
JANE STREET GROUP, LLC $29,913 0.06% 33,800
SBI Securities Co., Ltd. $29,212 0.06% 33,009
China Universal Asset Management Co., Ltd. $27,863 0.06% 31,484
Kovack Advisors, Inc. $27,435 0.06% 31,000
IPG Investment Advisors LLC $27,314 0.06% 30,864
Nuveen, LLC $26,618 0.06% 30,077
Northern Lights Advisors, Inc. $26,540 0.06% 29,989
DLK Investment Management, LLC $25,387 0.05% 23,727
COMMONWEALTH EQUITY SERVICES, LLC $23,983 0.05% 27,100
Wealth Management Associates, Inc. $23,319 0.05% 26,350
HBW ADVISORY SERVICES LLC $21,295 0.04% 19,902
Tower Research Capital LLC (TRC) $21,025 0.04% 23,758
Merit Financial Group, LLC $20,899 0.04% 23,616
Pallas Capital Advisors LLC $20,638 0.04% 23,320
Leonteq Securities AG $19,912 0.04% 22,500
NEUBERGER BERMAN GROUP LLC $19,262 0.04% 21,766
Y-Intercept (Hong Kong) Ltd $18,994 0.04% 17,752
LPL Financial LLC $18,571 0.04% 20,985
Vanguard Personalized Indexing Management, LLC $18,009 0.04% 20,350
Capital Investment Advisory Services, LLC $17,700 0.04% 20,000
VICTORY CAPITAL MANAGEMENT INC $17,372 0.04% 19,630
Bank of New York Mellon Corp $16,641 0.04% 18,805
SG Americas Securities, LLC $15,491 0.03% 17,505
Focus Partners Wealth $15,238 0.03% 17,219
JPMORGAN CHASE & CO $15,107 0.03% 17,071
Flagship Private Wealth, LLC $12,529 0.03% 14,158
Procyon Advisors, LLC $12,098 0.03% 13,671
Balyasny Asset Management L.P. $12,061 0.03% 13,629
RAYMOND JAMES FINANCIAL INC $11,512 0.02% 13,008
Laurion Capital Management LP $11,282 0.02% 12,749
Callan Family Office, LLC $10,725 0.02% 12,119
Jefferies Financial Group Inc. $10,044 0.02% 11,350
Integrated Wealth Concepts LLC $10,029 0.02% 11,333
NewEdge Advisors, LLC $9,883 0.02% 11,168

Showing the top 100 of 138 holders. Create a free account to see every holder, past quarters, search, filters and CSV export.

Key facts CIK 1816431 CUSIP 74765K105 13F (30d) 11 filings 11 filers Visit website Investor relations