John S. Vieceli

CIK: 0002032947

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)12 (85.7%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)2 (14.3%)

Compensation grants

Other (G, F, J, C, D, …)0 (0.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

QSI

Quantum-Si Inc

Officer

Discretionary Trading P&L

Holdings

Transaction History (14 total)

QSI
Quantum-Si Inc
Jun 23, 2026
Sale(S)
Direct
15.1K shares at avg. $0.90$14K
QSI
Quantum-Si Inc
Jun 22, 2026
Sale(S)
Direct
15.1K shares at avg. $0.96$14K
QSI
Quantum-Si Inc
Mar 23, 2026
Sale(S)
Direct
11.2K shares at avg. $0.83$9K
QSI
Quantum-Si Inc
Mar 20, 2026
Sale(S)
Direct
10.8K shares at avg. $0.85$9K
QSI
Quantum-Si Inc
Mar 12, 2026
Award(A)
Direct
391.7K shares-
QSI
Quantum-Si Inc
Dec 22, 2025
Sale(S)
Direct
21.9K shares at avg. $1.28$28K
QSI
Quantum-Si Inc
Sep 23, 2025
Sale(S)
Direct
9.8K shares at avg. $1.64$16K
QSI
Quantum-Si Inc
Sep 22, 2025
Sale(S)
Direct
9.8K shares at avg. $1.68$17K
QSI
Quantum-Si Inc
Jun 23, 2025
Sale(S)
Direct
21.9K shares at avg. $1.61$35K
QSI
Quantum-Si Inc
Mar 21, 2025
Sale(S)
Direct
4.3K shares at avg. $1.39$6K
QSI
Quantum-Si Inc
Mar 12, 2025
Award(A)
Direct
708.3K shares-
QSI
Quantum-Si Inc
Dec 23, 2024
Sale(S)
Direct
4.3K shares at avg. $1.29$6K
QSI
Quantum-Si Inc
Sep 24, 2024
Sale(S)
Direct
2.1K shares at avg. $0.93$2K
QSI
Quantum-Si Inc
Sep 23, 2024
Sale(S)
Direct
2.2K shares at avg. $0.95$2K

		Type	Shares	Price		Ownership
Jun 23, 2026	QSI Quantum-Si Inc	Sale(S)	15,112	$0.90	$13,586	Direct
Jun 22, 2026	QSI Quantum-Si Inc	Sale(S)	15,111	$0.96	$14,467	Direct
Mar 23, 2026	QSI Quantum-Si Inc	Sale(S)	11,239	$0.83	$9,290	Direct
Mar 20, 2026	QSI Quantum-Si Inc	Sale(S)	10,758	$0.85	$9,126	Direct
Mar 12, 2026	QSI Quantum-Si Inc	Award(A)	391,681	-	$0	Direct
Dec 22, 2025	QSI Quantum-Si Inc	Sale(S)	21,927	$1.28	$27,979	Direct
Sep 23, 2025	QSI Quantum-Si Inc	Sale(S)	9,843	$1.64	$16,093	Direct
Sep 22, 2025	QSI Quantum-Si Inc	Sale(S)	9,843	$1.68	$16,562	Direct
Jun 23, 2025	QSI Quantum-Si Inc	Sale(S)	21,923	$1.61	$35,382	Direct
Mar 21, 2025	QSI Quantum-Si Inc	Sale(S)	4,317	$1.39	$5,981	Direct
Mar 12, 2025	QSI Quantum-Si Inc	Award(A)	708,333	-	-	Direct
Dec 23, 2024	QSI Quantum-Si Inc	Sale(S)	4,306	$1.29	$5,570	Direct
Sep 24, 2024	QSI Quantum-Si Inc	Sale(S)	2,117	$0.93	$1,970	Direct
Sep 23, 2024	QSI Quantum-Si Inc	Sale(S)	2,192	$0.95	$2,073	Direct

1-14 of 14 transactions

About Vieceli John S.

Vieceli John S. (SEC CIK 0002032947) files insider reports with the SEC as Chief Product Officer of Quantum-Si Inc (QSI).

Signal8 holds 10 ownership filings by Vieceli John S., all Form 4s, filed between Sep 25, 2024 and Jun 24, 2026. Those filings report 14 transactions, from Sep 23, 2024 to Jun 23, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Vieceli John S.'s filings is in BRANFORD, CT.

Recent filings by Vieceli John S.

Jun 23, 2026: Open-market sale of QSI shares (Form 4, code S).
Jun 22, 2026: Open-market sale of QSI shares (Form 4, code S).
Mar 23, 2026: Open-market sale of QSI shares (Form 4, code S).
Mar 20, 2026: Open-market sale of QSI shares (Form 4, code S).
Mar 12, 2026: Grant or award of QSI shares (Form 4, code A).

Other insiders filing for Quantum-Si Inc (QSI)

Hawkins Jeffrey Alan, President & CEO
Keyes Jeffry R., Chief Financial Officer
LaPointe Christian, GC & Corp. Secretary
Makes Brigid, Director
Fattori Ruth A, Director
Jafri Amir, Director

How to read Form 4 transaction codes