TransDigm Officer Joel Reiss Files Form 144 to Sell $8.89M in Common Stock

Executive Summary

TransDigm Group INC officer Joel Reiss filed a Form 144 on September 15, 2026, signaling an intention to sell 8,000 shares of common stock with an aggregate market value of approximately $8.89 million.

Key Transaction Details

• Insider: Joel Reiss
• Title / Relationship: Officer
• Number of Shares: 8,000 common shares
• Aggregate Market Value: $8,889,760.00 (implied price of ~$1,111.22 per share)
• Nature of Acquisition: Acquired via the exercise of stock options from the issuer with cash payment on September 15, 2026.
• Broker: Morgan Stanley Smith Barney LLC Executive Financial Services
• Rule 10b5-1 Plan: The proposed sales are pursuant to a pre-scheduled Rule 10b5-1 trading plan adopted on August 12, 2025.

Prior 3-Month Sales Activity

Under the same 10b5-1 trading plan, Joel Reiss executed the following sales in the preceding three months:

• August 17, 2026: 3,900 shares for gross proceeds of $4,831,152.30
• July 15, 2026: 3,900 shares for gross proceeds of $4,749,372.42

Market & Governance Context

The 8,000 shares represent roughly 0.014% of TransDigm's 55,276,525 shares outstanding. Because these sales stem from option exercises under a pre-established Rule 10b5-1 trading plan adopted over a year prior, this activity represents routine executive compensation realization rather than a discretionary market-timing decision.