Just for clarification, there are two companies, unrelated, with a Bilstein name connection.
Febi is the shortened version of the name Ferdinand Bilstein. They make many parts for cars, some of high quality and some that do not seem to be the best. Not sure, but I think it is a family owned company.
Another company makes the Bilstein shock absorbers. According to the shock absorber company's website, "BILSTEIN became a division of ThyssenKrupp Technologies AG in 1988, and a wholly-owned subsidiary in 2005." ThyssenKrupp is a huge conglomerate with headquarters in Germany.