DaveManuel.com · Institutional Ownership · Who Owns It
QUANTUM SI INC (QSI)
Institutional ownership reported to the SEC as of Q2 2026, across 22 quarters.
141
Reporting holders
$49.1M
Reported value
3.2%
Calls
1.4%
Puts
-17
Holder change
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC | $6.7M | 7,578,208 | 0.00% | 2q | +7.9%+$492.3K |
| ARK Investment Management LLC | $6.3M | 7,167,738 | 0.04% | 21q | +4.2%+$255.6K |
| BlackRock, Inc. | $4.6M | 5,225,352 | 0.00% | 8q | -61.0%-$7.2M |
| Amova Asset Management Americas, Inc. | $3.5M | 3,885,230 | 0.04% | 21q | -11.5%-$450.7K |
| Sumitomo Mitsui Trust Group, Inc. | $3.4M | 3,885,230 | 0.00% | 17q | -11.5%-$448.2K |
| MILLENNIUM MANAGEMENT LLC | $2.8M | 3,131,726 | 0.00% | new | NEW |
| UBS Group AG | $2.3M | 2,561,897 | 0.00% | 21q | +50.5%+$760.5K |
| JANE STREET GROUP, LLC | $2.1M incl. $248.8K options CALL+PUT | 2,142,735 | 0.00% | 14q | HELD |
| AQR CAPITAL MANAGEMENT LLC | $2.1M | 2,348,665 | 0.00% | 8q | -1.8%-$38.5K |
| GEODE CAPITAL MANAGEMENT, LLC | $2.0M | 2,236,526 | 0.00% | 21q | -41.7%-$1.4M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $1.4M incl. $374.4K options CALL+PUT | 1,116,750 | 0.00% | 21q | -23.7%-$424.4K |
| VANGUARD FIDUCIARY TRUST CO | $988.3K | 1,116,683 | 0.00% | 2q | HELD |
| STATE STREET CORP | $788.3K | 890,741 | 0.00% | 20q | -76.4%-$2.5M |
| GROUP ONE TRADING LLC | $700.3K incl. $605.2K options CALL+PUT | 107,473 | 0.00% | 21q | -62.2%-$1.2M |
| IMC-Chicago, LLC | $663.5K incl. $410.6K options CALL+PUT | 285,758 | 0.00% | 2q | +29.4%+$150.7K |
| Fosun International Ltd | $658.4K | 743,935 | 0.15% | 21q | HELD |
| RENAISSANCE TECHNOLOGIES LLC | $490.2K | 553,871 | 0.00% | 2q | +369.8%+$385.8K |
| SIMPLEX TRADING, LLC | $484.5K incl. $338.2K options CALL+PUT | 165,293 | 0.00% | 21q | +82.6%+$219.2K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $439.9K | 497,098 | 0.00% | 2q | -67.3%-$905.8K |
| GOLDMAN SACHS GROUP INC | $421.5K | 476,288 | 0.00% | 21q | +7.2%+$28.4K |
| NORTHERN TRUST CORP | $398.7K | 450,531 | 0.00% | 20q | -64.3%-$717.0K |
| Invesco Ltd. | $392.9K | 443,929 | 0.00% | 17q | +9.2%+$33.0K |
| BNP PARIBAS FINANCIAL MARKETS | $352.8K | 398,598 | 0.00% | 7q | +938.3%+$318.8K |
| IEQ CAPITAL, LLC | $310.5K | 350,816 | 0.00% | 2q | -1.9%-$6.1K |
| Aster Capital Management (DIFC) Ltd | $304.9K | 344,510 | 0.06% | new | NEW |
| CITADEL ADVISORS LLC | $294.6K incl. $255.4K options CALL+PUT | 44,335 | 0.00% | 21q | +185.2%+$191.3K |
| MORGAN STANLEY | $286.3K | 323,482 | 0.00% | 21q | +148.9%+$171.3K |
| IQ EQ FUND MANAGEMENT (IRELAND) Ltd | $284.2K | 321,134 | 0.02% | 9q | +9.9%+$25.7K |
| Knollwood Investment Advisory, LLC | $265.5K | 300,000 | 0.02% | 14q | HELD |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | $182.4K | 206,100 | 0.00% | 14q | -21.1%-$48.7K |
| BARCLAYS PLC | $182.0K | 205,690 | 0.00% | 18q | +425.6%+$147.4K |
| XTX Topco Ltd | $157.2K | 177,680 | 0.00% | 9q | -54.4%-$187.2K |
| Verdence Capital Advisors LLC | $140.1K | 158,305 | 0.01% | 4q | -22.3%-$40.3K |
| Mariner, LLC | $139.6K | 157,689 | 0.00% | 8q | -21.0%-$37.2K |
| Shay Capital LLC | $133.6K | 150,922 | 0.01% | 13q | HELD |
| FMR LLC | $109.5K | 123,767 | 0.00% | 16q | +287.2%+$81.2K |
| JONES FINANCIAL COMPANIES LLLP | $85.8K | 100,483 | 0.00% | 6q | -8.6%-$8.0K |
| AlphaCore Capital LLC | $83.2K incl. $4.1K options OPT | 89,493 | 0.00% | 5q | -30.3%-$36.2K |
| HRT FINANCIAL LP | $82.0K | 93,647 | 0.00% | new | NEW |
| Cerity Partners LLC | $75.5K | 85,347 | 0.00% | 2q | +5.8%+$4.2K |
| Vanguard Global Advisers, LLC | $75.0K | 84,757 | 0.00% | 2q | HELD |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $74.9K | 84,612 | 0.00% | 20q | -81.5%-$330.1K |
| Y-Intercept (Hong Kong) Ltd | $70.0K | 79,089 | 0.00% | new | NEW |
| JTC Employer Solutions Trustee Ltd | $69.0K | 77,787 | 0.01% | 5q | +125.2%+$38.4K |
| MERCER GLOBAL ADVISORS INC /ADV | $68.4K | 77,277 | 0.00% | 2q | +40.0%+$19.5K |
| RHUMBLINE ADVISERS | $67.2K | 75,989 | 0.00% | 17q | -60.6%-$103.6K |
| WINTON GROUP Ltd | $67.1K | 75,800 | 0.00% | new | NEW |
| Cambridge Investment Research Advisors, Inc. | $66.0K | 75,618 | 0.00% | 20q | +80.9%+$29.5K |
| CAPTRUST FINANCIAL ADVISORS | $64.7K | 73,128 | 0.00% | 6q | +5.9%+$3.6K |
| HOLLENCREST CAPITAL MANAGEMENT | $57.5K | 65,011 | 0.00% | 6q | +62.1%+$22.0K |
| GSA CAPITAL PARTNERS LLP | $53.0K | 60,011 | 0.00% | new | NEW |
| BANK OF AMERICA CORP /DE/ | $52.7K | 59,585 | 0.00% | 21q | -63.2%-$90.6K |
| Creative Planning | $49.5K | 55,884 | 0.00% | 2q | +6.3%+$3.0K |
| Atom Investors LP | $45.6K | 51,554 | 0.00% | new | NEW |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | $45.2K | 63,435 | 0.00% | 2q | -29.2%-$18.6K |
| Green Alpha Advisors, LLC | $40.6K | 45,921 | 0.03% | 12q | +6.3%+$2.4K |
| Sanctuary Advisors, LLC | $36.6K | 41,397 | 0.00% | 7q | -3.3%-$1.3K |
| Stratos Wealth Advisors, LLC | $35.4K | 40,036 | 0.00% | 6q | +166.3%+$22.1K |
| Point72 Asset Management, L.P. | $34.6K | 39,133 | 0.00% | new | NEW |
| BRIGHTON JONES LLC | $34.1K | 38,585 | 0.00% | 2q | +40.0%+$9.8K |
| Corient Private Wealth LP | $33.9K | 38,328 | 0.00% | new | NEW |
| Red Wave Investments LLC | $32.7K | 37,000 | 0.01% | 20q | HELD |
| Arax Advisory Partners | $32.6K | 36,790 | 0.00% | 2q | +2597.2%+$31.4K |
| SBI Securities Co., Ltd. | $29.2K | 33,009 | 0.00% | 7q | +2.7% |
| China Universal Asset Management Co., Ltd. | $27.9K | 31,484 | 0.00% | 3q | -9.3%-$2.8K |
| Kovack Advisors, Inc. | $27.4K | 31,000 | 0.00% | 3q | +3.3% |
| IPG Investment Advisors LLC | $27.3K | 30,864 | 0.00% | new | NEW |
| Nuveen, LLC | $26.6K | 30,077 | 0.00% | 6q | -93.3%-$372.9K |
| Northern Lights Advisors, Inc. | $26.5K | 29,989 | 0.01% | 3q | HELD |
| COMMONWEALTH EQUITY SERVICES, LLC | $24.0K | 27,100 | 0.00% | 12q | -9.0%-$2.4K |
| Wealth Management Associates, Inc. | $23.3K | 26,350 | 0.01% | 15q | -2.2% |
| Tower Research Capital LLC (TRC) | $21.0K | 23,758 | 0.00% | 19q | -4.8%-$1.0K |
| Merit Financial Group, LLC | $20.9K | 23,616 | 0.00% | 2q | -35.0%-$11.3K |
| Pallas Capital Advisors LLC | $20.6K | 23,320 | 0.00% | 2q | -9.5%-$2.2K |
| DLK Investment Management, LLC | $19.9K | 19,000 | 0.01% | 2q | +13.4%+$2.4K |
| Leonteq Securities AG | $19.9K | 22,500 | 0.00% | 6q | -10.0%-$2.2K |
| HBW ADVISORY SERVICES LLC | $19.7K | 22,292 | 0.00% | 6q | -1.8% |
| NEUBERGER BERMAN GROUP LLC | $19.3K | 21,766 | 0.00% | new | NEW |
| LPL Financial LLC | $18.6K | 20,985 | 0.00% | 6q | -6.6%-$1.3K |
| Vanguard Personalized Indexing Management, LLC | $18.0K | 20,350 | 0.00% | 8q | -15.2%-$3.2K |
| Capital Investment Advisory Services, LLC | $17.7K | 20,000 | 0.00% | 6q | HELD |
| VICTORY CAPITAL MANAGEMENT INC | $17.4K | 19,630 | 0.00% | 16q | -0.9% |
| ANCHYRA PARTNERS LLC | $16.8K | 18,974 | 0.00% | new | NEW |
| Bank of New York Mellon Corp | $16.6K | 18,805 | 0.00% | 20q | -95.1%-$322.4K |
| Focus Partners Wealth | $15.2K | 17,219 | 0.00% | 2q | -26.8%-$5.6K |
| JPMORGAN CHASE & CO | $15.2K | 17,071 | 0.00% | 19q | -79.6%-$59.1K |
| SG Americas Securities, LLC | $15.0K | 17,505 | 0.00% | 8q | -48.0%-$13.9K |
| Flagship Private Wealth, LLC | $12.5K | 14,158 | 0.00% | 17q | HELD |
| Procyon Advisors, LLC | $12.1K | 13,671 | 0.00% | 20q | HELD |
| Balyasny Asset Management L.P. | $12.1K | 13,629 | 0.00% | new | NEW |
| RAYMOND JAMES FINANCIAL INC | $11.5K | 13,008 | 0.00% | new | NEW |
| Laurion Capital Management LP | $11.3K | 12,749 | 0.00% | new | NEW |
| NorthCrest Asset Manangement, LLC | $10.8K | 11,218 | 0.00% | 2q | -7.6% |
| Callan Family Office, LLC | $10.7K | 12,119 | 0.00% | new | NEW |
| Jefferies Financial Group Inc. | $10.0K | 11,350 | 0.00% | new | NEW |
| Integrated Wealth Concepts LLC | $10.0K | 11,333 | 0.00% | 2q | -21.8%-$2.8K |
| NewEdge Advisors, LLC | $9.9K | 11,168 | 0.00% | 15q | -29.4%-$4.1K |
| Abel Hall, LLC | $9.8K | 11,060 | 0.00% | new | NEW |
| Krilogy Financial LLC | $9.4K | 10,635 | 0.00% | 2q | -36.4%-$5.4K |
| Schonfeld Strategic Advisors LLC | $9.2K | 10,439 | 0.00% | new | NEW |
Showing the largest 100 of 141 reported holders.
Tender offers and delisting
Schedules TO, 13E-3 and 14D-9 and Form 25 filed in the last 180 days. Price a share is read from the filing itself where it states one plainly; a marker means we found no figure we could stand behind, and the reason is on it.
| Filed | What | Filed by | Price a share | Source |
|---|---|---|---|---|
| 2026-06-10 | Delisting notice from the exchange | Nasdaq Stock Market LLC | - | filing |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q3 2026 | 23 | $4.4M | 4,110,887 | 3 | 6 | 7 | 0.0% |
| Q2 2026 | 141 | $49.1M | 52,890,983 | 27 | 36 | 56 | 4.6% |
| Q1 2026 | 158 | $50.6M | 63,116,250 | 39 | 39 | 37 | 3.2% |
| Q4 2025 | 138 | $78.1M | 67,498,675 | 30 | 35 | 38 | 4.9% |
| Q3 2025 | 124 | $98.0M | 64,729,855 | 13 | 42 | 36 | 6.7% |
| Q2 2025 | 135 | $132.7M | 64,824,248 | 16 | 54 | 34 | 4.3% |
| Q1 2025 | 139 | $72.7M | 57,798,608 | 39 | 42 | 34 | 4.6% |
| Q4 2024 | 124 | $152.7M | 53,664,735 | 33 | 41 | 23 | 5.1% |
| Q3 2024 | 107 | $46.2M | 52,063,444 | 18 | 23 | 31 | 0.7% |
| Q2 2024 | 100 | $56.7M | 53,589,315 | 13 | 27 | 27 | 1.0% |
| Q1 2024 | 97 | $106.3M | 53,448,225 | 14 | 18 | 35 | 1.2% |
| Q4 2023 | 92 | $115.6M | 56,869,544 | 5 | 27 | 24 | 1.2% |
| Q3 2023 | 100 | $92.9M | 54,525,992 | 24 | 30 | 16 | 2.5% |
| Q2 2023 | 91 | $78.7M | 43,847,030 | 9 | 36 | 16 | 0.3% |
| Q1 2023 | 98 | $76.8M | 43,522,351 | 12 | 28 | 29 | 0.3% |
| Q4 2022 | 105 | $91.8M | 49,691,168 | 13 | 31 | 24 | 1.0% |
| Q3 2022 | 99 | $171.7M | 61,595,113 | 10 | 27 | 22 | 1.4% |
| Q2 2022 | 99 | $174.7M | 62,633,714 | 29 | 25 | 21 | 1.5% |
| Q1 2022 | 93 | $256.8M | 53,869,259 | 17 | 31 | 21 | 2.3% |
| Q4 2021 | 97 | $526.5M | 65,559,193 | 33 | 20 | 14 | 2.1% |
| Q3 2021 | 75 | $573.9M | 67,631,693 | 25 | 17 | 12 | 1.7% |
| Q2 2021 | 74 | $730.7M | 59,056,485 | 78 | 0 | 0 | 2.2% |