Quantum-Si Inc. 13F holders
141 funds reported a position in Quantum-Si Inc. in their 13F for the quarter ended 30 June 2026, together 52.9 million shares worth $46.8 million. Against the quarter before, 27 opened a position, 36 added, 56 trimmed and 41 sold out; together they sold a net 10.1 million shares. The largest holders: Vanguard Capital Management LLC, ARK Investment Management LLC and BlackRock, Inc.
Funds holding141-16 on Q1 2026
Shares they held52.9Mworth $46.8 million
Net sold on the quarter10.1M sharesabout $8.9 million at the funds' values
Funds buying to selling63 to 97opened or added, to cut or sold
Opened 27Added 36Held 22Trimmed 56Sold out 41
What each fund did in QSI against its 13F for the quarter before; a change under 0.1% of a holding counts as held
Funds reporting a position in QSI in their 13F, each quarter; hover a bar for the shares they held
Filed so far for the quarter to 30 September 2026
3,405 funds have filed their 13F for the quarter so far; the rest are due by 16 November 2026. Of those, 26 reported a position in Quantum-Si Inc.: 2 opened one, 6 added, 8 trimmed and 14 sold out, a net 415,382 shares sold.
The largest moves in the name among the funds that have filed, against each fund's previous 13F.
The well-known funds
Of the 44 funds followed here, 7 reported a position in Quantum-Si Inc. in a 13F for the quarter ended 30 June 2026. The largest: ARK Investment Management, 7.2 million shares worth $6.3 million, 0.0% of its reported book. New this quarter: Millennium Management, Point72 Asset Management. Sold out: Two Sigma Investments. In the quarter, 6 funds added or opened a position and 2 trimmed or sold out; together they bought a net 2.4 million shares, about $2.1 million at the funds' own value per share on 30 June 2026. A change under 0.1% of a holding counts as held.
| Fund | Shares | Value | Of its book | Change on the quarter | Status | Quarter ended | Filing |
|---|---|---|---|---|---|---|---|
| ARK Investment Management | 7,167,738 | $6.3 million | 0.0% | +288,839 | added | 30 June 2026 | 13F |
| Millennium Management | 3,131,726 | $2.8 million | 0.0% | +3,131,726 | new | 30 June 2026 | 13F |
| Geode Capital Management | 2,236,526 | $2.0 million | 0.0% | -1,598,595 | trimmed | 30 June 2026 | 13F |
| Renaissance Technologies | 553,871 | $490,176 | 0.0% | +435,971 | added | 30 June 2026 | 13F |
| FMR LLC | 123,767 | $109,534 | 0.0% | +91,799 | added | 30 June 2026 | 13F |
| Citadel Advisors | 44,335 | $39,236 | 0.0% | +28,789 | added | 30 June 2026 | 13F |
| Point72 Asset Management | 39,133 | $34,633 | 0.0% | +39,133 | new | 30 June 2026 | 13F |
| Two Sigma Investments | 0 | $0 | 0.0% | -52,924 | exited | 30 June 2026 | 13F |
Value is what the fund reported.
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Change is shares against the fund's previous 13F; a fund with one filing read shows no change. 13Fs cover long US positions of managers above $100 million and are filed up to 45 days after the quarter.The largest holders
| Fund | Shares | Share of all | Value | Of its book | Change in shares | Filing |
|---|---|---|---|---|---|---|
| Vanguard Capital Management LLC | 7,578,208 | 14.33% | $6.7 million | 0.00% | +556,301 | 13F |
| ARK Investment Management LLC | 7,167,738 | 13.55% | $6.3 million | 0.04% | +288,839 | 13F |
| BlackRock, Inc. | 5,225,352 | 9.88% | $4.6 million | 0.00% | -8,189,597 | 13F |
| Amova Asset Management Americas, Inc. | 3,885,230 | 7.35% | $3.5 million | 0.04% | -506,436 | 13F |
| Sumitomo Mitsui Trust Group, Inc. | 3,885,230 | 7.35% | $3.4 million | 0.00% | -506,436 | 13F |
| Millennium Management LLC | 3,131,726 | 5.92% | $2.8 million | 0.00% | new | 13F |
| UBS Group AG | 2,561,897 | 4.84% | $2.3 million | 0.00% | +859,370 | 13F |
| AQR Capital Management LLC | 2,348,665 | 4.44% | $2.1 million | 0.00% | -43,514 | 13F |
| Geode Capital Management, LLC | 2,236,526 | 4.23% | $2.0 million | 0.00% | -1,598,595 | 13F |
| Jane Street Group, LLC | 2,142,735 | 4.05% | $1.9 million | 0.00% | new | 13F |
| Susquehanna International Group, LLP | 1,116,750 | 2.11% | $988,324 | 0.00% | -347,818 | 13F |
| Vanguard Fiduciary Trust Co. | 1,116,683 | 2.11% | $988,264 | 0.00% | -569 | 13F |
| State Street Corp. | 890,741 | 1.68% | $788,306 | 0.00% | -2,879,948 | 13F |
| Fosun International Ltd | 743,935 | 1.41% | $658,382 | 0.15% | no change | 13F |
| Renaissance Technologies LLC | 553,871 | 1.05% | $490,176 | 0.00% | +435,971 | 13F |
| Vanguard Portfolio Management LLC | 497,098 | 0.94% | $439,932 | 0.00% | -1,023,548 | 13F |
| Goldman Sachs Group Inc. | 476,288 | 0.90% | $421,515 | 0.00% | +32,111 | 13F |
| Northern Trust Corp. | 450,531 | 0.85% | $398,720 | 0.00% | -810,170 | 13F |
| Invesco Ltd. | 443,929 | 0.84% | $392,877 | 0.00% | +37,239 | 13F |
| BNP Paribas Financial Markets | 398,598 | 0.75% | $352,759 | 0.00% | +360,208 | 13F |
| Ieq Capital, LLC | 350,816 | 0.66% | $310,472 | 0.00% | -6,872 | 13F |
| Aster Capital Management (DIFC) Ltd | 344,510 | 0.65% | $304,891 | 0.07% | new | 13F |
| Morgan Stanley | 323,482 | 0.61% | $286,282 | 0.00% | +193,542 | 13F |
| IQ EQ FUND Management (Ireland) Ltd | 321,134 | 0.61% | $284,204 | 0.02% | +29,027 | 13F |
| Knollwood Investment Advisory, LLC | 300,000 | 0.57% | $265,500 | 0.02% | no change | 13F |
| IMC-Chicago, LLC | 285,758 | 0.54% | $252,896 | 0.00% | +64,882 | 13F |
| Bridgeway Capital Management, LLC | 206,100 | 0.39% | $182,399 | 0.00% | -55,000 | 13F |
| Barclays PLC | 205,690 | 0.39% | $182,035 | 0.00% | +166,553 | 13F |
| XTX Topco Ltd | 177,680 | 0.34% | $157,247 | 0.00% | -211,574 | 13F |
| Simplex Trading, LLC | 165,293 | 0.31% | $146,284 | 0.00% | +74,762 | 13F |
| Verdence Capital Advisors LLC | 158,305 | 0.30% | $140,100 | 0.01% | -45,550 | 13F |
| Mariner, LLC | 157,689 | 0.30% | $139,553 | 0.00% | -42,003 | 13F |
| Shay Capital LLC | 150,922 | 0.29% | $133,566 | 0.01% | no change | 13F |
| FMR LLC | 123,767 | 0.23% | $109,534 | 0.00% | +91,799 | 13F |
| Group One Trading LLC | 107,473 | 0.20% | $95,114 | 0.00% | -176,508 | 13F |
| Jones Financial Companies Lllp | 100,483 | 0.19% | $85,812 | 0.00% | -9,417 | 13F |
| HRT Financial LP | 93,647 | 0.18% | $82,000 | 0.00% | new | 13F |
| AlphaCore Capital LLC | 89,368 | 0.17% | $79,091 | 0.00% | -39,081 | 13F |
| Cerity Partners LLC | 85,347 | 0.16% | $75,533 | 0.00% | +4,697 | 13F |
| Vanguard Global Advisers, LLC | 84,757 | 0.16% | $75,010 | 0.00% | no change | 13F |
| Charles Schwab Investment Management Inc. | 84,612 | 0.16% | $74,882 | 0.00% | -372,959 | 13F |
| Y-Intercept (Hong Kong) Ltd | 79,089 | 0.15% | $69,994 | 0.00% | new | 13F |
| JTC Employer Solutions Trustee Ltd | 77,787 | 0.15% | $69,000 | 0.01% | +43,247 | 13F |
| Mercer Global Advisors Inc. | 77,277 | 0.15% | $68,390 | 0.00% | +22,082 | 13F |
| Rhumbline Advisers | 75,989 | 0.14% | $67,249 | 0.00% | -117,079 | 13F |
| Winton Group Ltd | 75,800 | 0.14% | $67,083 | 0.00% | new | 13F |
| Cambridge Investment Research Advisors, Inc. | 75,618 | 0.14% | $66,000 | 0.00% | +33,809 | 13F |
| Captrust Financial Advisors | 73,128 | 0.14% | $64,718 | 0.00% | +4,092 | 13F |
| Hollencrest Capital Management | 65,011 | 0.12% | $57,535 | 0.00% | +24,900 | 13F |
| Gsa Capital Partners LLP | 60,011 | 0.11% | $53,000 | 0.00% | new | 13F |
The 50 largest of the 141 funds that reported a position in QSI in their 13F for the quarter ended 30 June 2026, by the value each reported.
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Share of all is the fund's part of all the shares the funds reported. Change is shares against the fund's 13F for the quarter before. A 13F lists a manager's long positions in US-listed shares at the quarter's end. What is a 13F?Options the funds reported on QSI
| Fund | Option | Shares under the options | Value of those shares | Quarter ended | Filing |
|---|---|---|---|---|---|
| Citadel Advisors | Calls | 181,000 | $160,185 | 30 June 2026 | 13F |
| Citadel Advisors | Puts | 107,600 | $95,226 | 30 June 2026 | 13F |
A 13F lists calls and puts by the shares they cover and what those shares were worth at the quarter's end, not what the options cost.
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They are not counted in the holdings above. A put gains when the stock falls, a call when it rises, and a fund may hold either to hedge.Schedule 13D and 13G filed on the name, last twelve months
| Filed | Schedule | Who | Holding | Of the class | Event date | Rule or purpose | Filing |
|---|---|---|---|---|---|---|---|
| 28 August 2026 | 13D/A | Rothberg Jonathan M and 4 others | 19.9 million | 100.0% | 26 August 2026 | In connection with estate planning, entities owned by trusts created for the benefit of Dr. Jonathan Rothberg's children have entered into a trading plan pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended (the "Pl | EDGAR |
| 29 July 2026 | 13G/A | BlackRock, Inc. and 1 other | 4.6 million | 2.3% | 30 June 2026 | passive, institutional (13d-1(b)) | EDGAR |
A Schedule 13D is filed by anyone who crosses 5% of a class with intent to influence; a 13G by a passive holder.
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Amendments (/A) report a change, including an exit to zero. Holding and percentage are as the filer stated them on the cover page; the purpose is the filer's own words, cut short. 13D and 13GFails to deliver
| Settlement date | Shares failed | Price | File |
|---|---|---|---|
| 31 August 2026 | 2,413 | $0.78 | SEC |
| 28 August 2026 | 3,548 | $0.80 | SEC |
| 27 August 2026 | 18,847 | $0.79 | SEC |
| 25 August 2026 | 3,846 | $0.77 | SEC |
| 21 August 2026 | 38,691 | $0.78 | SEC |
| 13 August 2026 | 4,031 | $0.84 | SEC |
| 12 August 2026 | 2,407 | $0.82 | SEC |
| 10 August 2026 | 8,005 | $0.81 | SEC |
| 4 August 2026 | 6,543 | $0.75 | SEC |
| 22 July 2026 | 26 | $0.84 | SEC |
| 20 July 2026 | 276 | $0.82 | SEC |
| 17 July 2026 | 3,903 | $0.82 | SEC |
| 15 July 2026 | 200 | $0.87 | SEC |
Shares that failed to deliver at settlement, per day, from the SEC's half-month files, which arrive about two weeks after the period.