Latest Period
Q2 2026
Security Snapshot
Quantum-Si Inc - Class A Stock (QSI) Institutional Ownership
CUSIP: 74765K105
13F Institutional Holders and Ownership History from Q2 2021 to Q2 2026
Institutions Reporting
139
Shares (Excl. Options)
52,811,994
Price
$0.88
Save this security page for your next review
Keep this CUSIP in your watchlists so you can revisit quarter changes from one place. If you create an account from here, we will bring you back after verification.
- Security type / class
- Equity / Class A Stock
- Symbol
- QSI on Nasdaq
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 52,811,994
- Total 13F value
- $46,746,786
- Portfolio coverage rank
- 0%
- Share change
- -10,487,746
- Value change
- -$9,184,409
- Number of holders
- 139
- Shares outstanding
- 199,922,087
- SEC-reported price per share
- $0.84
- Insider filing price
- $0.84
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- QSI - Quantum-Si Inc - Class A Stock is tracked under CUSIP 74765K105.
- 139 institutions reported positions in Q2 2026.
- 6 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 156 to 139 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $48,952,321 to $46,746,786.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 139 institutions filings for Q2 2026.
Security key
74765K105
Latest holder period
Q2 2026
13F holders
139
13D/G owners
6
CIK / CUSIP context first
Open Q2 2026 holders
QSI full holder history
Quantum-Si Inc SEC filings
Quantum-Si Inc company facts
Quantum-Si Inc insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 74765K105:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
6
Security
QSI
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| ROTHBERG JONATHAN M | 100% | 0% | $23,326,875 | 19,937,500 | 0% | ROTHBERG JONATHAN M. | 09 Sep 2025 | |
| VANGUARD GROUP INC | 4.8% | -11% | $12,287,455 | +$63,233 | 8,714,507 | +0.52% | The Vanguard Group | 30 Sep 2025 |
| ARK Investment Management LLC | 4.8% | -11% | $11,792,099 | -$1,365,288 | 7,809,337 | -10% | ARK Investment Management LLC | 31 May 2025 |
| Nikko Asset Management Americas, Inc. | 4.8% | $7,217,902 | 5,965,208 | Nikko Asset Management Americas, Inc. | 31 Dec 2024 | |||
| Sumitomo Mitsui Trust Group, Inc. | 4.8% | $7,217,902 | 5,965,208 | Sumitomo Mitsui Trust Group, Inc. | 31 Dec 2024 | |||
| BlackRock, Inc. | 2.3% | $4,069,414 | 4,598,208 | BlackRock, Inc. | 30 Jun 2026 |
As of 30 Jun 2026, 139 institutional investors reported holding 52,811,994 shares of Quantum-Si Inc - Class A Stock (QSI). This represents 26% of the company’s total 199,922,087 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
24%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC | 3.8% | 7,578,208 | +7.9% | 0% | $6,706,714 |
| ARK Investment Management LLC | 3.6% | 7,167,738 | +4.2% | 0.04% | $6,343,448 |
| BlackRock, Inc. | 2.6% | 5,225,352 | -61% | 0% | $4,624,436 |
| Sumitomo Mitsui Trust Group, Inc. | 1.9% | 3,885,230 | -12% | 0% | $3,438,429 |
| Amova Asset Management Americas, Inc. | 1.9% | 3,885,230 | -12% | 0.04% | $3,457,855 |
| MILLENNIUM MANAGEMENT LLC | 1.6% | 3,131,726 | 0% | $2,771,578 | |
| UBS Group AG | 1.3% | 2,561,897 | +50% | 0% | $2,267,279 |
| AQR CAPITAL MANAGEMENT LLC | 1.2% | 2,348,665 | -1.8% | 0% | $2,078,569 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.1% | 2,236,526 | -42% | 0% | $1,980,439 |
| JANE STREET GROUP, LLC | 1.1% | 2,142,735 | 0% | $1,896,320 | |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 0.56% | 1,116,750 | -24% | 0% | $988,324 |
| VANGUARD FIDUCIARY TRUST CO | 0.56% | 1,116,683 | -0.05% | 0% | $988,264 |
| STATE STREET CORP | 0.45% | 890,741 | -76% | 0% | $788,306 |
| Fosun International Ltd | 0.37% | 743,935 | 0% | 0.16% | $658,382 |
| RENAISSANCE TECHNOLOGIES LLC | 0.28% | 553,871 | +370% | 0% | $490,176 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 0.25% | 497,098 | -67% | 0% | $439,932 |
| GOLDMAN SACHS GROUP INC | 0.24% | 476,288 | +7.2% | 0% | $421,515 |
| NORTHERN TRUST CORP | 0.23% | 450,531 | -64% | 0% | $398,720 |
| Invesco Ltd. | 0.22% | 443,929 | +9.2% | 0% | $392,877 |
| BNP PARIBAS FINANCIAL MARKETS | 0.2% | 398,598 | 0% | 0% | $352,759 |
| IEQ CAPITAL, LLC | 0.18% | 350,816 | -1.9% | 0% | $310,472 |
| Aster Capital Management (DIFC) Ltd | 0.17% | 344,510 | 0.06% | $304,891 | |
| MORGAN STANLEY | 0.16% | 323,482 | +149% | 0% | $286,282 |
| IQ EQ FUND MANAGEMENT (IRELAND) Ltd | 0.16% | 321,134 | +9.9% | 0.02% | $284,204 |
| Knollwood Investment Advisory, LLC | 0.15% | 300,000 | 0% | 0.02% | $265,500 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
21
Latest
Q2 2026
Rows shown
1-21 of 21
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 52,811,994 | $46,746,786 | -$9,184,409 | $0.88 | 139 |
| 2026 Q1 | 63,116,141 | $48,952,321 | -$4,155,498 | $0.77 | 156 |
| 2025 Q4 | 67,443,329 | $74,141,655 | +$2,647,825 | $1.10 | 134 |
| 2025 Q3 | 64,444,810 | $90,874,495 | -$423,140 | $1.41 | 120 |
| 2025 Q2 | 64,302,080 | $126,030,953 | +$13,332,090 | $1.96 | 131 |
| 2025 Q1 | 57,702,101 | $69,187,968 | +$4,278,851 | $1.20 | 132 |
| 2024 Q4 | 53,650,133 | $144,828,921 | +$7,467,683 | $2.70 | 119 |
| 2024 Q3 | 52,018,403 | $45,873,394 | -$1,304,094 | $0.88 | 106 |
| 2024 Q2 | 53,534,496 | $56,052,952 | +$296,093 | $1.05 | 97 |
| 2024 Q1 | 52,939,609 | $104,094,301 | -$7,060,197 | $1.97 | 93 |
| 2023 Q4 | 56,545,513 | $113,571,460 | +$3,979,280 | $2.01 | 88 |
| 2023 Q3 | 54,518,149 | $90,500,891 | +$17,074,897 | $1.66 | 94 |
| 2023 Q2 | 43,838,780 | $78,455,574 | +$764,050 | $1.79 | 88 |
| 2023 Q1 | 43,470,316 | $76,438,490 | -$11,104,148 | $1.76 | 95 |
| 2022 Q4 | 50,563,530 | $92,475,906 | +$3,565,426 | $1.83 | 98 |
| 2022 Q3 | 47,618,704 | $130,884,473 | -$2,677,367 | $2.75 | 96 |
| 2022 Q2 | 48,637,778 | $139,588,569 | +$2,799,359 | $2.32 | 93 |
| 2022 Q1 | 45,913,518 | $214,907,059 | -$18,856,558 | $4.68 | 86 |
| 2021 Q4 | 47,044,785 | $370,416,832 | +$7,975,560 | $7.87 | 91 |
| 2021 Q3 | 44,603,838 | $372,106,029 | -$32,106,463 | $8.34 | 70 |
| 2021 Q2 | 44,270,353 | $533,450,402 | +$533,145,402 | $12.26 | 70 |