TransDigm's hold thesis balances a wide-moat aerospace aftermarket model with outstanding margin performance against a premium valuation, heavy leverage, and persistent insider selling. Q2 2026 sales rose 18% to $2,544 million and EBITDA margin remained above 50%, confirming pricing power and commercial aftermarket strength. However, total debt ballooned to $30.0 billion in FY2025, leaving negative equity, and the stock still trades at a 97% premium on price/sales versus its peer median, while insiders have been net sellers of $240 million over the past 24 months.
Balance Sheet Strain
Debt reached $30.0B in FY2025 with negative equity of -$9.7B; rising interest costs could pressure net income if rates stay elevated or refinancing terms worsen.
Insider Liquidation
Over 24 months, insiders executed 464 disposition transactions vs. 83 acquisitions, net selling $240M; recent May 2026 sales near current prices may signal management sees limited near-term upside.
Valuation Premium
TDG trades at a P/S of 7.14, nearly double the peer median of 3.62; any growth deceleration could compress multiples significantly.
Commercial Aerospace Cycle
Aftermarket demand is tied to air traffic; a macroeconomic slowdown or prolonged supply-chain disruptions could slow organic growth.