In 2007, Plasan acquired LSI Group, a French holding company for AMEFO and BERARD. Both firms are manufacturers of high hardness steel hulls and metal equipment for the automotive and military industries.

Founded in 1948, AMEFO is one of the most experienced manufacturers of high hard steel (HHS) hulls in Europe, specializing in high-quality standard HHS welding and engineering for the military industries and heavy equipment manufacturers. AMEFO provides the group's customers with complete development and design services for up-to-date HHS hulls integrated with advanced composite armor materials.

Founded in 1962, BERARD is a "second tier" company, specializing in processing and manufacturing steel parts for the automotive industry for more than 44 years. BERARD manufactures high-quality steel parts involving laser cutting, welding, bending, punching and painting. BERARD is also active in the field of design and integration of steel structures, rollover protection bar systems and advanced automotive parts development and design.