David S. Grayzel

CIK: 0001732786

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)8 (72.7%)

Compensation grants

Other (G, F, J, C, D, …)3 (27.3%)

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

Companies & Roles (1)

QTTB

Q32 Bio Inc.

Director

Discretionary Trading P&L

Holdings

Transaction History (11 total)

QTTB
Q32 Bio Inc.
Jun 12, 2026
Award(A)
Stock Option (Right to Buy)
Direct
10.8K shares-
QTTB
Q32 Bio Inc.
Jun 12, 2026
Award(A)
Stock Option (Right to Buy)
Direct
9.8K shares-
QTTB
Q32 Bio Inc.
Jan 15, 2026
Award(A)
Stock Option (Right to Buy)
Direct
16.4K shares at avg. $2.75-
QTTB
Q32 Bio Inc.
Oct 23, 2025
Award(A)
Stock Option (Right to Buy)
Direct
53.5K shares-
QTTB
Q32 Bio Inc.
Feb 24, 2025
Award(A)
Stock Option (Right to Buy)
Direct
2.6K shares-
QTTB
Q32 Bio Inc.
Feb 24, 2025
Disposition(D)
Stock Option (Right to Buy)
Direct
18.6K shares-
QTTB
Q32 Bio Inc.
Feb 24, 2025
Award(A)
Stock Option (Right to Buy)
Direct
18.6K shares-
QTTB
Q32 Bio Inc.
Feb 24, 2025
Disposition(D)
Stock Option (Right to Buy)
Direct
12.8K shares-
QTTB
Q32 Bio Inc.
Feb 24, 2025
Award(A)
Stock Option (Right to Buy)
Direct
12.8K shares-
QTTB
Q32 Bio Inc.
Feb 24, 2025
Disposition(D)
Stock Option (Right to Buy)
Direct
2.6K shares-
QTTB
Q32 Bio Inc.
Jan 15, 2025
Award(A)
Stock Option (Right to Buy)
Direct
18.6K shares-

		Type	Shares	Price		Ownership
Jun 12, 2026	QTTB Q32 Bio Inc.	Award(A) Stock Option (Right to Buy)	10,826	-	-	Direct
Jun 12, 2026	QTTB Q32 Bio Inc.	Award(A) Stock Option (Right to Buy)	9,810	-	-	Direct
Jan 15, 2026	QTTB Q32 Bio Inc.	Award(A) Stock Option (Right to Buy)	16,363	$2.75	-	Direct
Oct 23, 2025	QTTB Q32 Bio Inc.	Award(A) Stock Option (Right to Buy)	53,521	-	-	Direct
Feb 24, 2025	QTTB Q32 Bio Inc.	Award(A) Stock Option (Right to Buy)	2,569	-	-	Direct
Feb 24, 2025	QTTB Q32 Bio Inc.	Disposition(D) Stock Option (Right to Buy)	18,595	-	-	Direct
Feb 24, 2025	QTTB Q32 Bio Inc.	Award(A) Stock Option (Right to Buy)	18,595	-	-	Direct
Feb 24, 2025	QTTB Q32 Bio Inc.	Disposition(D) Stock Option (Right to Buy)	12,767	-	-	Direct
Feb 24, 2025	QTTB Q32 Bio Inc.	Award(A) Stock Option (Right to Buy)	12,767	-	-	Direct
Feb 24, 2025	QTTB Q32 Bio Inc.	Disposition(D) Stock Option (Right to Buy)	2,569	-	-	Direct
Jan 15, 2025	QTTB Q32 Bio Inc.	Award(A) Stock Option (Right to Buy)	18,595	-	-	Direct

1-11 of 11 transactions

About GRAYZEL DAVID S.

GRAYZEL DAVID S. (SEC CIK 0001732786) files insider reports with the SEC as Director of Q32 Bio Inc. (QTTB).

Signal8 holds 5 ownership filings by GRAYZEL DAVID S., all Form 4s, filed between Feb 26, 2025 and Jul 21, 2026. Those filings report 11 transactions, from Jan 15, 2025 to Jun 12, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on GRAYZEL DAVID S.'s filings is in WALTHAM, MA.

Recent filings by GRAYZEL DAVID S.

Jun 12, 2026: Grants or awards of QTTB derivative securities (2 lines, Form 4, code A).
Jan 15, 2026: Grant or award of QTTB derivative securities (Form 4, code A).
Oct 23, 2025: Grant or award of QTTB derivative securities (Form 4, code A).
Feb 24, 2025: Grant or award of QTTB derivative securities (Form 4, code A).
Feb 24, 2025: Disposition to issuer transaction of QTTB derivative securities (Form 4, code D).

Other insiders filing for Q32 Bio Inc. (QTTB)

Morrison Jodie Pope, CEO
Violette Shelia M., Chief Scientific Officer
Kalowski Lee, CFO and President
TZIANABOS ARTHUR, Director
Lundberg Sven Ante, Director
LAPORTE KATHLEEN, Director

How to read Form 4 transaction codes