TransDigm Co-COO Joel Reiss Has Sold $119 Million — 444 Transactions at the Defense Monopoly

Co-Chief Operating Officer Joel Reiss at TransDigm Group (TDG) has sold $119 million in stock across 444 transactions, including 26 recent Form 4 filings. The sole-source defense and aerospace parts supplier — valued at $80 billion — has one of the most active insider sellers in the industrials sector.

444 Transactions, $119 Million

Reiss's selling at TransDigm has been a long-running, systematic program. At 444 transactions, he averages one sale every few business days — a pace that reflects a heavily automated trading plan designed for continuous equity extraction. His most recent $5 million in sales continues the pattern without interruption.

The TransDigm Business Model

TransDigm's business model is unique — and controversial. The company acquires aerospace and defense parts manufacturers, often gaining sole-source positions on proprietary components. Once it controls the only approved supplier for a specific part, it raises prices aggressively. The Pentagon's Inspector General has repeatedly criticized TransDigm's pricing practices, finding markups of up to 9,400% on certain parts.

Despite the controversy, the model has been enormously profitable for shareholders. TransDigm's stock has risen from under $100 to over $1,400 over the past decade, generating spectacular returns.

Insider Profile

Metric	Value
Insider	Joel Reiss
Title	Co-Chief Operating Officer
Career Sales	$119.0 million
Total Transactions	444
Recent Form 4 Filings	26
Recent Sales	$5.0 million
Shares Remaining	Still holds

Defense Spending Tailwinds

TransDigm benefits directly from increased defense budgets and commercial aviation recovery. The company's aftermarket parts business — where it holds monopoly positions — generates enormous margins. Revenue grew 18% in the most recent fiscal year, and the stock trades near all-time highs.

Yet Reiss, one of the two executives running day-to-day operations, has been steadily reducing his exposure. At $119 million in total sales and counting, the Co-COO has extracted significant value while the stock appreciated.

The Consistency Factor

What distinguishes Reiss's selling is its sheer consistency. The 26 recent filings and 444 career transactions suggest this is not a reaction to any specific catalyst — it's a permanent, structural selling program. For a company that trades at 30x forward earnings in a capital-intensive industry, the insider's continuous bet-reducing is worth monitoring.

Track all TransDigm insider activity on the TDG stock page.