TransDigm Group INC (TDG)

TD Group, through its wholly-owned subsidiary TransDigm Inc., is a global designer, producer and supplier of highly engineered aircraft components used on nearly all commercial and military aircraft in service. About 90% of fiscal 2025 net sales came from proprietary products, and about 55% came from the aftermarket, which has historically carried higher gross profit and been more stable than sales to original equipment manufacturers (OEMs). The company says aircraft life of roughly 25 to 30 years, together with production runs of 20 to 30 years, gives its parts a product life cycle of more than 50 years. Its strategy rests on a value-driven operating approach (obtaining profitable new business, improving its cost structure, and providing highly engineered value-added products) and a selective acquisition strategy. It has acquired 95 businesses and product lines since 1993, focusing on proprietary aerospace component businesses with significant aftermarket content.

The business is organized into three reporting segments. Power & Control makes components that provide or control power on aircraft, including actuators, ignition systems, pumps and valves, motors and generators, batteries, sensors, switches, hoists and winches, cargo handling systems, and microwave electronic components. Airframe makes non-power airframe and cabin products, including latching and locking devices, connectors and elastomer seals, cockpit security systems and displays, audio and antenna systems, lavatory components, seat belts, interior surfaces, thermal insulation, lighting, parachutes, and testing services and equipment. Non-aviation serves other markets with ground transportation seat belts, space actuators, gas turbine actuators and fuel valves, refueling systems for heavy equipment, and turbine controls for energy and oil and gas.

Customers include aerospace component distributors, commercial airlines, aircraft OEMs, the U.S. armed forces and friendly foreign governments, defense OEMs, system suppliers, and industrial customers. The commercial aftermarket generally accounts for 30% to 35% of annual net sales, commercial OEM for 25% to 30%, and defense for about 35% to 40%. The top ten customers made up about 40% of fiscal 2025 net sales, and no single customer exceeded 10%.

The company buys raw materials and manufactured component parts from various suppliers, most of which are available from multiple sources at competitive prices. It also buys replacement parts for its repair and overhaul operations and maintains FAA-approved repair stations. It competes in fragmented niche markets against U.S. and foreign firms, from divisions of large corporations to small private companies. Competition is based on engineering, quality, reliability, timely delivery and customer service. Regulatory and certification requirements, such as those of the FAA and the European Union Aviation Safety Agency, can deter new entrants. As of September 30, 2025, it had about 16,500 employees, roughly 15% of them unionized.