We show that successful foreign market entry is related to the extent of foreign presence in an industry at the time of entry. Survival of 31 Canadian-based businesses that entered 24 U.S. medical sector markets between 1968 and 1989 tended to be somewhat longer in product markets in which foreign-based businesses held a moderate market share when the Canadian businesses entered than in low and high foreign share product markets. The result controls several other industry and business-level factors, including industry concentration, entry year, corporate size, related diversification, entry mode, and service sector status.