Production had reached a high-point of 147 M.S.406 aircraft during August 1939, before declining as manufacturing efforts were progressively re-directed towards other aircraft, such as the Lioré et Olivier LeO 45. Manufacturing of the M.S.406 was wound down during March 1940, by which point the original order for 1,000 fighters had been delivered in full to the French Air Force, along with a further 77 aircraft which had been constructed for foreign users (30 fighters for Finland and 45 for Turkey). Additional M.S.406 orders that had been placed for Lithuania and Poland were cancelled with the outbreak of the war.