Bertrand Decoster founded Mygale SARL on 31 January 1989 at the age of 24, following his studies at the Ecole superieure des techniques aeronautiques et de construction automobile. His goal was to build the first French Formula Ford car. The market was dominated by Van Diemen, Reynard, and Swift, making early progress difficult. To develop customer relationships and generate revenue, Mygale established a racing school at the Autodrome de Linas-Montlhery near Paris, which operated under the Formula Mygale banner from 1991 providing tuition in the company's own Formula Ford chassis.
Early success came through the French championship. Factory-supported driver Bertrand Godin finished second in the 1993 and 1994 French Formula Ford championships. In 1995, Patrice Gay — entered by Graff Racing — won both the French and European Formula Ford championships, giving Mygale its first major titles. David Terrien won the French championship again in 1996 in a Mygale.
International attention arrived in 1997, when Ricardo Sperafico and Richard Tarling finished second and third at the Formula Ford Festival, driving customer Mygales entered by Haywood Racing. In 1998, Jenson Button won both the Formula Ford Festival and the British Formula Ford championship in a Mygale, elevating the French constructor's profile substantially. Nicolas Kiesa had an outstanding 1999 season, winning the British championship and finishing runner-up in the European championship in Mygale chassis.
After Mygale's departure from Formula Renault competition at the end of the 1990s, the company concentrated its efforts on Formula Ford. It won nine consecutive British Formula Ford championships at some point, and when the British series adopted the Ford EcoBoost engine, Mygale was the sole chassis supplier during the 2012 season. At the Formula Ford Festival in 2000, Mygale scored a one-two result with Anthony Davidson and Danica Patrick.
Mygale entered Formula Renault in 1995, with Cyrille Sauvage winning both the French Formula Renault Championship and the Formula Renault Eurocup in a factory Mygale. In 1996, David Saelens achieved four podiums and second place in the Eurocup. After withdrawing from the Eurocup for 1997, the company returned in 1998 with Matthew Davies and Julien Beltoise, who finished first and second in the French championship and second and third in the Eurocup respectively. Mygale left the open-formula Formula Renault market after 1999 as Tatuus and Martini came to dominate.
In 2001, Mygale was contracted by BMW to build the cars for the spec Formula BMW championship. The chassis was used between 2001 and 2012 across various official BMW championships worldwide, and a total of 38 Formula BMW champions were crowned in Mygale-built cars. The company also produced a sportscar for Peugeot Sport — the Spider THP — used in the THP Spider Cup from 2007 with national variants running in France and Denmark.
In 2000, Mygale was contracted to supply all cars for the Portuguese Formula Novis championship. In 2012, the company entered the American F1600 Championship Series with Bryan Herta Autosport as official importer, with factory-backed driver Brandon Newey winning four races in the inaugural season and Adrian Starrantino repeating the result in 2013.
Mygale entered the Australian Formula Ford market in 1996, and won its first Australian championship race in 1998. Greg Ritter won the 1999 Australian Formula Ford Championship in a Mygale, the first outright national title for the marque in Australia. Luke Youlden won in 2000. After a period of limited entries between 2001 and 2006, Mygale returned strongly in 2007 when Tim Blanchard and James Moffat finished first and second in the Australian championship. Australian championship victories followed in 2008, 2009, 2011, 2012, and 2013.
Mygale constructed its first Formula Three car, the M-06, in 2006. The successor M-07 appeared at the 2007 Masters of Formula Three, and limited entries followed in the Formula Three Euroseries through 2008. The most significant F3 result came in Italy in 2012, when Riccardo Agostini won the Italian Formula Three championship in a Mygale, taking five victories. A new Formula Four car, the M14-F4, was launched in 2014 under FIA Formula Four regulations, and was adopted by the French, British, Chinese, NACAM, Southeast Asian, Danish, and Argentine F4 championships. A second-generation M21-F4 conforming to updated FIA rules was introduced in 2021.
In December 2024, Ligier Automotive acquired a majority stake in Mygale. On 10 April 2025, Ligier announced that Mygale would be fully consolidated as a subsidiary under the name Ligier Advanced Technologies, with existing Mygale cars in production to be renamed as Ligiers. The first major project under the new identity is the Ligier JS F326, a Formula Three car developed for the 2026 Regional Formula Three Championships worldwide.
Mygale's trajectory from an outsider trying to break into a Van Diemen-dominated Formula Ford market to a contracted supplier for BMW's global championship series and multiple national spec formulae illustrates the commercial value of consistent engineering combined with competitive pricing. Jenson Button's 1998 Formula Ford Festival win in a Mygale marked an inflection point for the marque's credibility, and the long sequence of British Formula Ford titles thereafter confirmed its position as the leading chassis in that discipline.