Latest Period
Q2 2026
Security Snapshot
Quantum-Si Inc - Class A common stock, par value $0.0001 per share, Class B common stock, par value $0.0001 per share (QSI) Institutional Ownership
CUSIP: 74765K105
13F Institutional Holders and Ownership History from Q2 2021 to Q2 2026
Institutions Reporting
141
Shares (Excl. Options)
52,850,622
Price
$0.88
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- Security type / class
- Equity / Class A common stock, par value $0.0001 per share, Class B common stock, par value $0.0001 per share
- Symbol
- QSI on Nasdaq
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 52,850,622
- Total 13F value
- $46,780,971
- Portfolio coverage rank
- 0%
- Share change
- -10,457,818
- Value change
- -$9,156,979
- Number of holders
- 141
- Shares outstanding
- 19,937,500
- 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 common stock, par value $0.0001 per share, Class B common stock, par value $0.0001 per share is tracked under CUSIP 74765K105.
- 141 institutions reported positions in Q2 2026.
- 6 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 156 to 141 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $48,952,321 to $46,780,971.
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 141 institutions filings for Q2 2026.
Security key
74765K105
Latest holder period
Q2 2026
13F holders
141
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% | $16,747,500 | 19,937,500 | 0% | ROTHBERG JONATHAN M. | 26 Aug 2026 | |
| 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, 141 institutional investors reported holding 52,850,622 shares of Quantum-Si Inc - Class A common stock, par value $0.0001 per share, Class B common stock, par value $0.0001 per share (QSI). This represents 265% of the company’s total 19,937,500 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
243%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC | 38% | 7,578,208 | +7.9% | 0% | $6,706,714 |
| ARK Investment Management LLC | 36% | 7,167,738 | +4.2% | 0.04% | $6,343,448 |
| BlackRock, Inc. | 26% | 5,225,352 | -61% | 0% | $4,624,436 |
| Sumitomo Mitsui Trust Group, Inc. | 19% | 3,885,230 | -12% | 0% | $3,438,429 |
| Amova Asset Management Americas, Inc. | 19% | 3,885,230 | -12% | 0.04% | $3,457,855 |
| MILLENNIUM MANAGEMENT LLC | 16% | 3,131,726 | 0% | $2,771,578 | |
| UBS Group AG | 13% | 2,561,897 | +50% | 0% | $2,267,279 |
| AQR CAPITAL MANAGEMENT LLC | 12% | 2,348,665 | -1.8% | 0% | $2,078,569 |
| GEODE CAPITAL MANAGEMENT, LLC | 11% | 2,236,526 | -42% | 0% | $1,980,439 |
| JANE STREET GROUP, LLC | 11% | 2,142,735 | 0% | $1,896,320 | |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 5.6% | 1,116,750 | -24% | 0% | $988,324 |
| VANGUARD FIDUCIARY TRUST CO | 5.6% | 1,116,683 | -0.05% | 0% | $988,264 |
| STATE STREET CORP | 4.5% | 890,741 | -76% | 0% | $788,306 |
| Fosun International Ltd | 3.7% | 743,935 | 0% | 0.16% | $658,382 |
| RENAISSANCE TECHNOLOGIES LLC | 2.8% | 553,871 | +370% | 0% | $490,176 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 2.5% | 497,098 | -67% | 0% | $439,932 |
| GOLDMAN SACHS GROUP INC | 2.4% | 476,288 | +7.2% | 0% | $421,515 |
| NORTHERN TRUST CORP | 2.3% | 450,531 | -64% | 0% | $398,720 |
| Invesco Ltd. | 2.2% | 443,929 | +9.2% | 0% | $392,877 |
| BNP PARIBAS FINANCIAL MARKETS | 2% | 398,598 | 0% | 0% | $352,759 |
| IEQ CAPITAL, LLC | 1.8% | 350,816 | -1.9% | 0% | $310,472 |
| Aster Capital Management (DIFC) Ltd | 1.7% | 344,510 | 0.06% | $304,891 | |
| MORGAN STANLEY | 1.6% | 323,482 | +149% | 0% | $286,282 |
| IQ EQ FUND MANAGEMENT (IRELAND) Ltd | 1.6% | 321,134 | +9.9% | 0.02% | $284,204 |
| Knollwood Investment Advisory, LLC | 1.5% | 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 | 52,850,622 | $46,780,971 | -$9,156,979 | $0.88 | 141 |
| 2026 Q1 | 63,116,141 | $48,952,321 | -$4,160,683 | $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 |