Gregory K. Chow

CIK: 0001761333

Transaction Breakdown

Open Market Buys (P)1 (14.3%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)1 (14.3%)

Derivative conversions

Awards (A)5 (71.4%)

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)

STRO

SUTRO BIOPHARMA, INC.

Officer

Discretionary Trading P&L

Holdings

Transaction History (7 total)

STRO
SUTRO BIOPHARMA, INC.
Jun 2, 2026
Exercise(M)
Direct
2.5K shares-
STRO
SUTRO BIOPHARMA, INC.
Mar 2, 2026
Award(A)
Stock Option (right to buy)
Direct
40K shares-
STRO
SUTRO BIOPHARMA, INC.
Mar 2, 2026
Award(A)
Restricted Stock Units (RSUs)
Direct
5K shares-
STRO
SUTRO BIOPHARMA, INC.
Dec 23, 2025
Award(A)
Stock Option (right to buy)
Direct
8.2K shares-
STRO
SUTRO BIOPHARMA, INC.
Oct 15, 2025
Purchase(P)
Direct
19.8K shares at avg. $0.81$16K
STRO
SUTRO BIOPHARMA, INC.
Jun 2, 2025
Award(A)
Stock Option (right to buy)
Direct
275K shares-
STRO
SUTRO BIOPHARMA, INC.
Jun 2, 2025
Award(A)
Restricted Stock Unit (RSU)
Direct
100K shares-

		Type	Shares	Price		Ownership
Jun 2, 2026	STRO SUTRO BIOPHARMA, INC.	Exercise(M)	2,500	-	$0	Direct
Mar 2, 2026	STRO SUTRO BIOPHARMA, INC.	Award(A) Stock Option (right to buy)	40,000	-	-	Direct
Mar 2, 2026	STRO SUTRO BIOPHARMA, INC.	Award(A) Restricted Stock Units (RSUs)	5,000	-	-	Direct
Dec 23, 2025	STRO SUTRO BIOPHARMA, INC.	Award(A) Stock Option (right to buy)	8,200	-	-	Direct
Oct 15, 2025	STRO SUTRO BIOPHARMA, INC.	Purchase(P)	19,750	$0.81	$15,998	Direct
Jun 2, 2025	STRO SUTRO BIOPHARMA, INC.	Award(A) Stock Option (right to buy)	275,000	-	-	Direct
Jun 2, 2025	STRO SUTRO BIOPHARMA, INC.	Award(A) Restricted Stock Unit (RSU)	100,000	-	-	Direct

1-7 of 7 transactions

About Chow Gregory K.

Chow Gregory K. (SEC CIK 0001761333) files insider reports with the SEC as CFO of SUTRO BIOPHARMA, INC. (STRO).

Signal8 holds 6 ownership filings by Chow Gregory K. (1 Form 3, 5 Form 4), filed between Jun 2, 2025 and Jun 2, 2026. Those filings report 7 transactions, from Jun 2, 2025 to Jun 2, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Chow Gregory K.'s filings is in SOUTH SAN FRANCISCO, CA.

Recent filings by Chow Gregory K.

Jun 2, 2026: Option exercise of STRO shares (Form 4, code M).
Mar 2, 2026: Grants or awards of STRO derivative securities (2 lines, Form 4, code A).
Dec 23, 2025: Grant or award of STRO derivative securities (Form 4, code A).
Oct 15, 2025: Open-market purchase of STRO shares (Form 4, code P).
Jun 2, 2025: Grants or awards of STRO derivative securities (2 lines, Form 4, code A).

Other insiders filing for SUTRO BIOPHARMA, INC. (STRO)

Gerber Hans-Peter, CHIEF SCIENTIFIC OFFICER
Wigginton Jon Marc, Director
Petree Daniel H, Director
PANEK JAMES P, Director
Lobacki Joseph M, Director
Jagpal Sukhi, Director

How to read Form 4 transaction codes