Mack John Prosper 4

4 · Orchestra BioMed Holdings, Inc. · Filed Jun 25, 2026

AI-generated summary of this filing

Updated Jun 25, 2026

Orchestra BioMed (OBIO) Director Mack J. Prosper Receives RSU Award

What Happened

Mack John Prosper, a director of Orchestra BioMed Holdings, Inc. (OBIO), was granted 34,653 restricted stock units (RSUs) on June 23, 2026 (reported as an A — Award/Grant). The RSUs were reported at $0.00 per share on the Form 4 because they are contingent awards, not open-market purchases.
On June 24, 2026, 3,510 shares were disposed (reported as F — tax withholding) to satisfy tax withholding obligations in connection with RSU vesting. The filing notes no shares were sold in the market to cover withholding.

Key Details

Transaction dates: 2026-06-23 (grant of 34,653 RSUs) and 2026-06-24 (3,510 shares withheld for taxes).
Reported prices: $0.00 per share for both entries (reflects award/withholding reporting convention).
Shares owned following reported transactions: Not specified in the filing; 34,653 RSUs are contingent rights to receive shares upon vesting.
Relevant footnotes: F1 — RSUs awarded on 6/23/2026 will vest on the one-year anniversary subject to continuous service. F2 — The 3,510 shares were withheld by the issuer to satisfy tax withholding; no market sale occurred.
Filing date and timeliness: Form 4 filed 2026-06-25; appears to be timely (filed within the Form 4 reporting window).

Context

RSUs are compensation awards that convert to actual shares only upon vesting (here, one year after grant if service conditions are met). The withholding action is a routine tax-related step and did not involve a public sale of shares.
This filing reflects an equity compensation grant and related tax withholding rather than an insider purchase or open-market sale; such grants are common for directors and executives as part of compensation.

Form 4

Period: 2026-06-23

Director

Transactions

Award
Common Stock, par value $0.0001 per share ("Common Stock")
[F1]
2026-06-23+34,653→ 74,939 total
Tax Payment
Common Stock
[F2]
2026-06-24−3,510→ 71,429 total

Footnotes (2)

[F1]Represents an award of restricted stock units ("RSUs") awarded to the Reporting Person on June 23, 2026 (the "Grant Date"). Each RSU represents a contingent right to receive one share of Common Stock. The RSUs will vest on the one year anniversary of the Grant Date, subject to the Reporting Person's continuous service through such date.
[F2]Represents the withholding of shares by the Issuer to satisfy tax withholding obligations in connection with vesting of RSUs. No shares were sold in the market as a result of the vesting of these RSUs and the satisfaction of tax withholding obligations.

Signature

/s/ Andrew Taylor, Attorney-in-Fact|2026-06-25

1 file