The Company commenced operations in 1942 in a small plant in the Montréal suburb of Longueuil where it manufactured machined parts for a variety of military purposes. It began to specialize in the aeronautical industry in the 50's. During the 1960's, the Company designed, developed and manufactured servomechanisms and the landing gear for the CL-215 water bomber built by Canadair Limited and for the DHC-6 Twin Otter built by De Havilland (both now divisions of Bombardier Inc.). During this period, the Company was fortunate to be awarded the contract to manufacture the landing gear for the Apollo Lunar Module and by doing so, become an active and ciritical participant to this extraordinary voyage to the Moon.

In June 1985, all of the Company's outstanding shares held since 1973 by Bombardier Inc., were acquired by Mr. Sarto Richer and Mr. Gilles Labbé, both senior executives of the Company.

In December 1986, the Company made its initial public offering of common shares to finance among other things the modernization of its facilities. As a result, the Company became a public entity whose common shares were listed on the Montréal Exchange (now on the Toronto Stock Exchange).

In November 1987, Héroux expanded into the United States through the acquisition of McSwain Manufacturing Corporation in order to diversify its operations and enter the industrial market.

On June 3, 1999, the Company acquired Métro Machining Corporation and Les Industries C.A.T. inc., specializing in aircraft structural components. These two acquisitions became the foundation of the Aerostructures Division.

In June 2000, Héroux announced the successful completion of its take-over bid for all of the shares of Devtek Corporation. In September of that year, Héroux Inc. changed its name to Héroux-Devtek Inc.

On April 1, 2004 the Company acquired Progressive Inc., a Texas-based manufacturer of large components to military aircraft OEM. The acquisition strengthened Héroux-Devtek's Aerostructure Division by providing access to the important military aerospace sector and its aircraft platform.

Over the past five years, Héroux-Devtek gained a strong reputation on the market and is now recognized as a key player in the design and qualification of landing gear systems. New platforms are now being designed by the Landing gear Division such as  the Sikorsky CH-53K Heavylift helicopter, Embraer Legacy 450/500 and Bombardier Learjet 85 Business jets.