John Prosper Mack

CIK: 0002031699

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)3 (60.0%)

Compensation grants

Other (G, F, J, C, D, …)2 (40.0%)

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

Companies & Roles (1)

OBIO

Orchestra BioMed Holdings, Inc.

Director

Discretionary Trading P&L

Holdings

Transaction History (5 total)

OBIO
Orchestra BioMed Holdings, Inc.
Aug 12, 2026
Tax Payment(F)
Direct
4.9K shares at avg. $4.42$22K
OBIO
Orchestra BioMed Holdings, Inc.
Jun 24, 2026
Tax Payment(F)
Direct
3.5K shares-
OBIO
Orchestra BioMed Holdings, Inc.
Jun 23, 2026
Award(A)
Direct
34.7K shares-
OBIO
Orchestra BioMed Holdings, Inc.
Aug 7, 2025
Award(A)
Direct
15K shares-
OBIO
Orchestra BioMed Holdings, Inc.
Jun 24, 2025
Award(A)
Direct
12.4K shares-

		Type	Shares	Price		Ownership
Aug 12, 2026	OBIO Orchestra BioMed Holdings, Inc.	Tax Payment(F)	4,885	$4.42	$21,592	Direct
Jun 24, 2026	OBIO Orchestra BioMed Holdings, Inc.	Tax Payment(F)	3,510	-	$0	Direct
Jun 23, 2026	OBIO Orchestra BioMed Holdings, Inc.	Award(A)	34,653	-	$0	Direct
Aug 7, 2025	OBIO Orchestra BioMed Holdings, Inc.	Award(A)	15,000	-	-	Direct
Jun 24, 2025	OBIO Orchestra BioMed Holdings, Inc.	Award(A)	12,422	-	-	Direct

1-5 of 5 transactions

About Mack John Prosper

Mack John Prosper (SEC CIK 0002031699) files insider reports with the SEC as Director of Orchestra BioMed Holdings, Inc. (OBIO).

Signal8 holds 4 ownership filings by Mack John Prosper, all Form 4s, filed between Jun 26, 2025 and Aug 14, 2026. Those filings report 5 transactions, from Jun 24, 2025 to Aug 12, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Mack John Prosper's filings is in NEW HOPE, PA.

Recent filings by Mack John Prosper

Aug 12, 2026: Tax withholding of OBIO shares (Form 4, code F).
Jun 24, 2026: Tax withholding of OBIO shares (Form 4, code F).
Jun 23, 2026: Grant or award of OBIO shares (Form 4, code A).
Aug 7, 2025: Grant or award of OBIO shares (Form 4, code A).
Jun 24, 2025: Grant or award of OBIO shares (Form 4, code A).

Other insiders filing for Orchestra BioMed Holdings, Inc. (OBIO)

Sherman Darren
Hochman David P
Taylor Andrew Lawrence, Chief Financial Officer
Aiello Joshua, Principal Accounting Officer
Pacitti David, Director
Fain Eric S, Director

How to read Form 4 transaction codes