Insider Transactions Reported by 26 Insiders of Quantum-Si Inc

Symbol: QSI, QSIAW on Nasdaq
Location: Branford, CT

Quick Takeaways

QSI - Quantum-Si Inc has 26 insiders with reported activity on this page.
Net insider value flow over the last year: -$165,047.
Recent transaction rows are available for direct filing-level review.

What Changed

Buy value: $564,250; sell value: $729,297.
Net share flow: +46,400.

Why This Matters

This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.

Source Evidence

Filed on Form 4

Issuer insider activity is sourced from SEC Forms 3, 4, and 5.

See Original Filing

Insider trading overview

Last 12 months

Net insider flow leans to selling over the last 12 months. Net value: -$165,047.

Buys

$564,250

Shares: 609,890

Insiders: 2

Sells

$729,297

Shares: 563,490

Insiders: 6

Net

-$165,047

Shares: +46,400

Insiders: -4

Window (months)	Buy shares	Sell shares	Buy $	Sell $	Net $
0-3	609,890	308,575	$564,250	$297,937	+$266,313
3-6	0	66,212	$0	$84,487	-$84,487
6-9	0	122,505	$0	$240,037	-$240,037
9-12	0	66,198	$0	$106,837	-$106,837

Quantum-Si Inc executives and other stock owners filed with the SEC include:

Name	Relationship	Holdings Value	Past Year Net Change	Change %	Valuation	Report Date
Ph.D. Jonathan M. Rothberg	Director, 10%+ Owner	$22,488,490	-$80,112	-0.35%	Mixed	16 Oct 2025
2012 JMR Trust Common LLC	10%+ Owner	$22,089,791			Mixed	10 Jun 2021
James B. Tananbaum	Director	$14,911,041			Mixed	10 Jun 2021
Jeffrey Alan Hawkins	President & CEO, Director	$3,673,960	-$291,264	-7.3%	Filing P/S	20 Apr 2026
John Viii Stark	Chief Executive Officer, Director	$3,499,941			Mixed	10 Jan 2022
Jeffry R. Keyes	Chief Financial Officer	$1,723,919	-$119,837	-6.5%	Filing P/S	20 Apr 2026
Kevin Rakin	Director	$1,476,819			Mixed	19 May 2025
Todd C. Bennett	Chief Commercial Officer	$1,114,286	-$61,316	-5.2%	Filing P/S	22 Sep 2025
Ph.D. Christian LaPointe	GC & Corp. Secretary	$990,280	-$62,337	-5.9%	Filing P/S	20 Mar 2026
John S. Vieceli	Chief Product Officer	$967,665	-$114,432	-11%	Filing P/S	20 Mar 2026
Charles R. Kummeth	Director	$786,258	+$459,800	+141%	Filing P/S	05 Mar 2026
Matthew Dyer	Chief Business Officer	$590,106			Mixed	13 Jun 2022
Grace Johnston	Chief Commercial Officer	$353,915			Filing P/S	21 Jun 2024
Paula Dowdy	Director	$255,786	+$104,450	+69%	Filing P/S	05 Mar 2026
Ruth A. Fattori	Director	$206,319			Mixed	19 May 2025
Scott Mendel	Director	$171,630			Mixed	19 May 2025
John P. Kenny	Director	$138,284			Mixed	19 May 2025
Amir Jafri	Director	$135,652			Mixed	24 Feb 2026
Vikram Bajaj	Director	$117,999			Mixed	16 Jun 2022
Brigid Makes	Director	$24,819			Mixed	19 May 2025
Michael P. Mckenna	EVP, Product Development & Ops				Mixed	15 Mar 2023
Patrick Schneider	President and COO				Mixed	15 Mar 2023
4C Holdings I, LLC	10%+ Owner				Mixed	10 Jun 2021
Michael Mina	Director				Mixed	12 May 2023
Marijn E. Dekkers	Director				Mixed	11 May 2022
Claudia Drayton	Chief Financial Officer				Mixed	15 Mar 2023

Top shareholders of Quantum-Si Inc (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
Ph.D. Jonathan M. Rothberg	13D/G 3/4/5	ROTHBERG JONATHAN M. · Director, 10%+ Owner	100%	19,937,500	$23,326,875	$0	09 Sep 2025	13D/G 3/4/5
2012 JMR Trust Common LLC	3/4/5	10%+ Owner	— class O/S missing	12,480,108	$22,089,791	—	10 Jun 2021	3/4/5
James B. Tananbaum	3/4/5	Director	— class O/S missing	8,424,317	$14,911,041	—	10 Jun 2021	3/4/5
BlackRock, Inc.	13F	Company	7.1%	13,054,057	$14,359,463	—	31 Dec 2025	13F
VANGUARD GROUP INC	13D/G 13F	The Vanguard Group · Company	4.8%	8,714,507	$12,287,455	+$63,233	30 Sep 2025	13D/G 13F
ARK Investment Management LLC	13D/G 13F	Company	4.8%	7,809,337	$11,792,099	-$1,365,288	31 May 2025	13D/G 13F
Amova Asset Management Americas, Inc.	13D/G 13F	Nikko Asset Management Americas, Inc. · Company	4.8%	5,965,208	$7,217,902	$0	31 Dec 2024	13D/G 13F
Sumitomo Mitsui Trust Group, Inc.	13D/G 13F	Company	4.8%	5,965,208	$7,217,902	$0	31 Dec 2024	13D/G 13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	2.3%	4,114,375	$4,526,616	—	31 Dec 2025	13F
STATE STREET CORP	13F	Company	2%	3,562,721	$3,918,993	—	31 Dec 2025	13F
Jeffrey Alan Hawkins	3/4/5	President & CEO, Director	— mixed-class rows	5,254,118 mixed-class rows	$3,673,960	-$291,264	20 Apr 2026	3/4/5
John Viii Stark	3/4/5	Chief Executive Officer, Director	— class O/S missing	1,977,368	$3,499,941	—	10 Jan 2022	3/4/5
CITADEL ADVISORS LLC	13F	Company	1.5%	2,676,097	$2,943,707	—	31 Dec 2025	13F
SUSQUEHANNA INTERNATIONAL GROUP, LLP	13F	Company	— mixed-class rows	2,422,916 mixed-class rows	$2,579,628	—	31 Dec 2025	13F
NORTHERN TRUST CORP	13F	Company	1.2%	2,207,936	$2,428,730	—	31 Dec 2025	13F
Jeffry R. Keyes	3/4/5	Chief Financial Officer	— mixed-class rows	2,513,429 mixed-class rows	$1,723,919	-$119,837	20 Apr 2026	3/4/5
UBS Group AG	13F	Company	— mixed-class rows	1,451,650 mixed-class rows	$1,594,894	—	31 Dec 2025	13F
TWO SIGMA INVESTMENTS, LP	13F	Company	0.76%	1,384,181	$1,522,599	—	31 Dec 2025	13F
Kevin Rakin	3/4/5	Director	— mixed-class rows	1,346,607 mixed-class rows	$1,476,819	—	19 May 2025	3/4/5
JANE STREET GROUP, LLC	13F	Company	— mixed-class rows	1,120,994 mixed-class rows	$1,217,837	—	31 Dec 2025	13F
Todd C. Bennett	3/4/5	Chief Commercial Officer	0.37%	681,521	$1,114,286	-$61,316	22 Sep 2025	3/4/5
Ph.D. Christian LaPointe	3/4/5	GC & Corp. Secretary	— mixed-class rows	1,510,356 mixed-class rows	$990,280	-$62,337	20 Mar 2026	3/4/5
John S. Vieceli	3/4/5	Chief Product Officer	— mixed-class rows	1,639,165 mixed-class rows	$967,665	-$114,432	20 Mar 2026	3/4/5
Fosun International Ltd	13F	Company	0.41%	743,935	$818,329	—	31 Dec 2025	13F
Charles R. Kummeth	3/4/5	Director	— mixed-class rows	981,095 mixed-class rows	$786,258	+$459,800	05 Mar 2026	3/4/5
Matthew Dyer	3/4/5	Chief Business Officer	— class O/S missing	333,393	$590,106	—	13 Jun 2022	3/4/5
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F	Company	0.26%	468,174	$514,991	—	31 Dec 2025	13F
XTX Topco Ltd	13F	Company	0.25%	461,982	$508,180	—	31 Dec 2025	13F
Nuveen, LLC	13F	Company	0.24%	447,519	$492,271	—	31 Dec 2025	13F
Bank of New York Mellon Corp	13F	Company	0.22%	406,291	$446,920	—	31 Dec 2025	13F
Invesco Ltd.	13F	Company	0.22%	402,821	$443,103	—	31 Dec 2025	13F
MORGAN STANLEY	13F	Company	0.22%	399,994	$439,994	—	31 Dec 2025	13F
GOLDMAN SACHS GROUP INC	13F	Company	0.21%	386,824	$425,507	—	31 Dec 2025	13F
Grace Johnston	3/4/5	Chief Commercial Officer	— class O/S missing	295,940	$353,915	—	21 Jun 2024	3/4/5
Knollwood Investment Advisory, LLC	13F	Company	0.16%	300,000	$330,000	—	31 Dec 2025	13F
Quadrature Capital Ltd	13F	Company	0.15%	276,889	$304,578	—	31 Dec 2025	13F
ALLIANCEBERNSTEIN L.P.	13F	Company	0.15%	272,180	$299,398	—	31 Dec 2025	13F
BARCLAYS PLC	13F	Company	0.15%	269,415	$296,357	—	31 Dec 2025	13F
BRIDGEWAY CAPITAL MANAGEMENT, LLC	13F	Company	0.14%	261,100	$287,210	—	31 Dec 2025	13F
BANK OF AMERICA CORP /DE/	13F	Company	0.14%	258,445	$284,289	—	31 Dec 2025	13F
IQ EQ FUND MANAGEMENT (IRELAND) Ltd	13F	Company	0.14%	253,895	$279,285	—	31 Dec 2025	13F
GROUP ONE TRADING LLC	13F	Company	0.13%	245,801	$270,381	—	31 Dec 2025	13F
Virtu Financial LLC	13F	Company	0.13%	238,379	$262,000	—	31 Dec 2025	13F
Paula Dowdy	3/4/5	Director	— mixed-class rows	395,202 mixed-class rows	$255,786	+$104,450	05 Mar 2026	3/4/5
RHUMBLINE ADVISERS	13F	Company	0.11%	193,595	$212,948	—	31 Dec 2025	13F
MILLENNIUM MANAGEMENT LLC	13F	Company	0.1%	191,791	$210,970	—	31 Dec 2025	13F
Verdence Capital Advisors LLC	13F	Company	0.1%	187,805	$206,585	—	31 Dec 2025	13F
Ruth A. Fattori	3/4/5	Director	— mixed-class rows	296,607 mixed-class rows	$206,319	—	19 May 2025	3/4/5
WELLS FARGO & COMPANY/MN	13F	Company	0.1%	176,132	$193,745	—	31 Dec 2025	13F
LOS ANGELES CAPITAL MANAGEMENT LLC	13F	Company	0.05%	93,010	$188,810	—	31 Dec 2025	13F

Recent Insider Transactions by Companies or Individuals for Quantum-Si Inc

Showing up to 300 most recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	Value $	* Price $	Shares	Shares Owned	Date	Ownership
Jeffry R. Keyes	QSI	Class A Common Stock	Sale	-2.11%	$37,194	$0.9950	-37,381	1,732,582	21 Apr 2026	Direct
Jeffrey Alan Hawkins	QSI	Class A Common Stock	Sale	-2.22%	$83,293	$0.9950	-83,712	3,692,423	21 Apr 2026	Direct
Jeffry R. Keyes	QSI	Class A Common Stock	Sale	-2.07%	$37,621	$1.01	-37,382	1,769,963	20 Apr 2026	Direct
Jeffrey Alan Hawkins	QSI	Class A Common Stock	Sale	-2.17%	$84,248	$1.01	-83,712	3,776,135	20 Apr 2026	Direct
Jeffry R. Keyes	QSI	Class A Common Stock	Sale	-0.24%	$3,655	$0.8266	-4,422	1,807,345	23 Mar 2026	Direct
Ph.D. Christian LaPointe	QSI	Class A Common Stock	Sale	-0.51%	$5,051	$0.8266	-6,110	1,198,017	23 Mar 2026	Direct
John S. Vieceli	QSI	Class A Common Stock	Sale	-0.95%	$9,290	$0.8266	-11,239	1,170,657	23 Mar 2026	Direct
Jeffrey Alan Hawkins	QSI	Class A Common Stock	Sale	-0.31%	$10,042	$0.8266	-12,149	3,859,847	23 Mar 2026	Direct
Jeffry R. Keyes	QSI	Class A Common Stock	Sale	-0.23%	$3,591	$0.8483	-4,233	1,811,767	20 Mar 2026	Direct
Ph.D. Christian LaPointe	QSI	Class A Common Stock	Sale	-0.48%	$4,962	$0.8483	-5,849	1,204,127	20 Mar 2026	Direct
John S. Vieceli	QSI	Class A Common Stock	Sale	-0.9%	$9,126	$0.8483	-10,758	1,181,896	20 Mar 2026	Direct
Jeffrey Alan Hawkins	QSI	Class A Common Stock	Sale	-0.3%	$9,864	$0.8483	-11,628	3,871,996	20 Mar 2026	Direct
Jeffry R. Keyes	QSI	Class A Common Stock	Award	56.1%			652,803	1,816,000	12 Mar 2026	Direct
Jeffry R. Keyes	QSI	Stock Option (Right to Buy)	Award				780,847	780,847	12 Mar 2026	Direct
John S. Vieceli	QSI	Class A Common Stock	Award	48.9%			391,681	1,192,654	12 Mar 2026	Direct
John S. Vieceli	QSI	Stock Option (Right to Buy)	Award				468,508	468,508	12 Mar 2026	Direct
Jeffrey Alan Hawkins	QSI	Class A Common Stock	Award	50.6%			1,305,606	3,883,624	12 Mar 2026	Direct
Jeffrey Alan Hawkins	QSI	Stock Option (Right to Buy)	Award				1,561,695	1,561,695	12 Mar 2026	Direct
Ph.D. Christian LaPointe	QSI	Class A Common Stock	Award	27.5%			261,121	1,209,976	12 Mar 2026	Direct
Ph.D. Christian LaPointe	QSI	Stock Option (Right to Buy)	Award				312,339	312,339	12 Mar 2026	Direct
Charles R. Kummeth	QSI	Class A Common Stock	Purchase	140.8%	$459,800	$0.9196	500,000	855,000	05 Mar 2026	Direct
Paula Dowdy	QSI	Class A Common Stock	Purchase	69%	$104,450	$0.9505	109,890	269,107	05 Mar 2026	Direct
Amir Jafri	QSI	Stock Option (right to buy)	Award				114,055	114,055	24 Feb 2026	Direct
John S. Vieceli	QSI	Class A Common Stock	Sale	-2.66%	$27,979	$1.28	-21,927	800,973	22 Dec 2025	Direct
Christian LaPointe	QSI	Class A Common Stock	Sale	-1.24%	$15,249	$1.28	-11,951	948,855	22 Dec 2025	Direct
Jeffry R. Keyes	QSI	Class A Common Stock	Sale	-0.74%	$11,008	$1.28	-8,627	1,163,197	22 Dec 2025	Direct
Jeffrey Alan Hawkins	QSI	Class A Common Stock	Sale	-0.91%	$30,250	$1.28	-23,707	2,578,018	22 Dec 2025	Direct
Ph.D. Jonathan M. Rothberg	QSI	Class A Common Stock	Sale	-1.35%	$80,112	$3.07	-26,095	1,904,866	16 Oct 2025	By NVR TR, LLC
Christian LaPointe	QSI	Class A Common Stock	Sale	-0.56%	$8,770	$1.64	-5,364	960,806	23 Sep 2025	Direct
Jeffrey Alan Hawkins	QSI	Class A Common Stock	Sale	-0.41%	$17,401	$1.64	-10,643	2,601,725	23 Sep 2025	Direct
John S. Vieceli	QSI	Class A Common Stock	Sale	-1.18%	$16,093	$1.64	-9,843	822,900	23 Sep 2025	Direct
Jeffry R. Keyes	QSI	Class A Common Stock	Sale	-0.33%	$6,332	$1.64	-3,873	1,171,824	23 Sep 2025	Direct
Todd C. Bennett	QSI	Class A Common Stock	Sale	-2.64%	$30,218	$1.64	-18,482	681,521	23 Sep 2025	Direct
Christian LaPointe	QSI	Class A Common Stock	Sale	-0.55%	$9,025	$1.68	-5,364	966,170	22 Sep 2025	Direct
Jeffrey Alan Hawkins	QSI	Class A Common Stock	Sale	-0.41%	$17,908	$1.68	-10,643	2,612,368	22 Sep 2025	Direct
John S. Vieceli	QSI	Class A Common Stock	Sale	-1.17%	$16,562	$1.68	-9,843	832,743	22 Sep 2025	Direct
Jeffry R. Keyes	QSI	Class A Common Stock	Sale	-0.33%	$6,517	$1.68	-3,873	1,175,697	22 Sep 2025	Direct
Todd C. Bennett	QSI	Class A Common Stock	Sale	-2.57%	$31,098	$1.68	-18,482	700,003	22 Sep 2025	Direct
Jeffrey Alan Hawkins	QSI	Class A Common Stock	Sale	-0.9%	$38,258	$1.61	-23,705	2,623,011	23 Jun 2025	Direct
John S. Vieceli	QSI	Class A Common Stock	Sale	-2.54%	$35,382	$1.61	-21,923	842,586	23 Jun 2025	Direct
Christian LaPointe	QSI	Class A Common Stock	Sale	-1.21%	$19,280	$1.61	-11,946	971,534	23 Jun 2025	Direct
Jeffry R. Keyes	QSI	Class A Common Stock	Sale	-0.73%	$13,918	$1.61	-8,624	1,179,570	23 Jun 2025	Direct
John P. Kenny	QSI	Stock Option (right to buy)	Award				126,095	126,095	19 May 2025	Direct
Charles R. Kummeth	QSI	Stock Option (right to buy)	Award				126,095	126,095	19 May 2025	Direct
Brigid Makes	QSI	Stock Option (right to buy)	Award				126,095	126,095	19 May 2025	Direct
Jonathan M. Rothberg	QSI	Stock Option (right to buy)	Award				126,095	126,095	19 May 2025	Direct
Paula Dowdy	QSI	Stock Option (right to buy)	Award				126,095	126,095	19 May 2025	Direct
Kevin Rakin	QSI	Stock Option (right to buy)	Award				126,095	126,095	19 May 2025	Direct
Scott Mendel	QSI	Stock Option (right to buy)	Award				126,095	126,095	19 May 2025	Direct
Ruth A. Fattori	QSI	Stock Option (right to buy)	Award				126,095	126,095	19 May 2025	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.