In autumn 1940, Simex opened its office, in two rooms above the
Le Lido next to 78
Champs-Élysées in Paris, and opposite the offices of
Organisation Todt, the German military engineering organisation, who would become its best customer. It took almost a year of work, starting in the autumn of 1940 for Léon Grossvogel and
Hillel Katz to register the business with the Paris Commercial Court on 26 September 1940. Its name was a metonym for
S for
Societe,
IM for
Import,
EX for
Export. Trepper who used the alias Monsieur Gilbert in his dealings with the firm and several members of staff used the company to obtain special permits that allowed them to cross demarcation lines to observe the progress of construction. Although Trepper became one of the main directors and general manager of the firm, using the alias Monsieur
Jean Gilbert when dealing with any of the employees, he was not a shareholder. and Robert Breyer, a friend of Grossvogel who was the other shareholder. In the day-to-day operations of the business, both Trepper in the role of Monsieur Gilbert and Grossvogel, an
industrialist who does business
always on the go, are ignored by office staff. The most important of the permanent staff was Suzanne Cointe, who was considered by Trepper to be
our man at Simex. Trepper kept accurate note of spending, that had to be accounted for by Soviet intelligence. Corbin, an experienced businessman, had been recruited by Katz. In February 1942, the company moved to 3rd floor offices at 89
Boulevard Haussmann at the insistence of Alfred Corbin, who believed their current location was rife with thieves. ==Expenses==