Quantum-Si Incorporated (QSI)
Nasdaq: QSI · Measuring & Controlling Devices, NEC · Branford, CT · filing with the SEC since 2020
Who owns Quantum-Si Incorporated
As filed with the SECHolders of 5% or more
1
Rothberg Jonathan M. holds 100% of Class A common stock, par value $0.0001 per share, Class B common stock, par value $0.0001 per share, as its SCHEDULE 13D/A filed Aug 28, 2026 says.
Directors and officers
14
report now, of 29 people on the record since 2020. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 1 named at left.
Holders of 5% or moreshare of the class, as filed
Rothberg Jonathan M.
SCHEDULE 13D/A · filed Aug 28, 2026 · Class A common stock, par value $0.0001 per share, Class B common stock, par value $0.0001 per share · 100% in Sep 11, 2025
Nikko Asset Management Americas, Inc.
SCHEDULE 13G/A · filed Feb 13, 2025 · Class A common stock, par value $0.0001 per share · reported falling below 5%
Sumitomo Mitsui Trust Group, Inc.
SCHEDULE 13G/A · filed Feb 4, 2025 · Class A common stock, par value $0.0001 per share · reported falling below 5%
The Vanguard Group
SCHEDULE 13G/A · filed Oct 30, 2025 · Common Stock · reported falling below 5%, from 5.3% in Jul 29, 2025
ARK Investment Management LLC
SCHEDULE 13G/A · filed Jun 6, 2025 · Common Stock · reported falling below 5%, from 5.34% in May 14, 2025
Blackrock, Inc.
SCHEDULE 13G/A · filed Jul 29, 2026 · Class A Stock · reported falling below 5%
What QSI reports owning in othersstakes of 5% or more, and other ties
2 subsidiaries in 2 countries, from the list filed with the 10-K filed Mar 17, 2023.
Insider tradesForm 4
31sales
2purchases
1sales on a scheduled plan
5people selling
$600,000sold, in dollars
$600,000bought, in dollars
Open-market trades on Form 4 from Sep 30, 2025 to Sep 30, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Sep 30, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window7 of 31 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Hawkins Jeffrey Alan | President & CEO | 9 | $300,000 | 0 | 0 | $0 |
| Rothberg Jonathan M | Interim CEO | 1 | $100,000 | 1 | 0 | $0 |
| Keyes Jeffry R. | Chief Financial Officer | 9 | $100,000 | 0 | 0 | $0 |
| Vieceli John S. | Chief Product Officer | 5 | $100,000 | 0 | 0 | $0 |
| Lapointe Christian | GC & Corp. Secretary | 7 | $100,000 | 0 | 0 | $0 |
| Dowdy Paula | director | 0 | $0 | 0 | 1 | $100,000 |
| Kummeth Charles R. | director | 0 | $0 | 0 | 1 | $500,000 |