Form 4: TransDigm COO sells shares after option exercise

TransDigm Co-COO Joel Reiss exercised 3,900 options at $284.97 and sold the resulting shares via a Rule 10b5-1 plan, reducing direct holdings to 3,600 shares.

Summary

• Joel Reiss, Co-Chief Operating Officer of TransDigm Group (TDG), reported transactions dated 11/17/2025 under a Rule 10b5-1 trading plan.
• Exercised 3,900 stock options at an exercise price of $284.97 per share and acquired 3,900 common shares (transaction code M).
• Sold 3,900 common shares in multiple open market tranches on 11/17/2025 at weighted-average prices ranging from approximately $1,326.16 to $1,354.9199 (transaction code S).
• Direct beneficial ownership changed from 7,500 to 3,600 common shares after the sales.
• Remaining derivative securities (stock options) after the transactions total 43,100.
• The exercised option was first exercisable on 09/30/2021 and expires on 11/08/2027.
• Form signed by attorney-in-fact Rachel Quinlan on 11/18/2025.

Sentiment

Score: 5

Explanation: Routine 10b5-1 option exercise and sale by an executive; neutral signal with no operational or financial performance implications disclosed.

Positives

• Transactions conducted pursuant to a Rule 10b5-1(c) trading plan, indicating pre-arranged, systematic trading.
• Executive retains 3,600 directly owned shares following the sales.
• Executive continues to hold 43,100 stock options after the reported transactions.

Negatives

• Net selling of 3,900 shares on 11/17/2025, reducing direct holdings from 7,500 to 3,600 shares.
• All shares acquired through option exercise were sold the same day in multiple tranches.

Future Outlook

No forward-looking statements or guidance provided.

Industry Context

Insider trading reports like this Form 4 are routine across aerospace and defense suppliers; sales executed under Rule 10b5-1 plans are common governance practices to reduce perceived informational timing risk.

Comparison to Industry Standards

• Use of Rule 10b5-1 trading plans is in line with practices among large U.S. aerospace/defense companies (e.g., HEICO, RTX, GE Aerospace) for scheduled executive trading.
• Option exercise-and-sell transactions are a standard approach for executives to cover tax/liquidity needs without implying operational commentary.

Stakeholder Impact

• Executive reduced direct holdings by 3,900 shares to 3,600 shares.
• Transactions were executed under a Rule 10b5-1 plan, providing pre-arranged trading structure.
• Executive retains 43,100 options, maintaining equity-linked exposure.

Key Dates

Keywords

TransDigm Group, TDG, Form 4, insider transaction, Rule 10b5-1 plan, stock option exercise, insider selling, aerospace, Joel Reiss, executive trading