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Day By Day, a Paris-based research company with 80 clients, gave the best trading recommendations on European equities over the past three years, trumping Credit Suisse Group AG (CSGN) and Goldman Sachs Group Inc. (GS), according to a report by AQ Research.

The study by London-based AQ measured which firms gave the most accurate forecast on stock movements. Royal Bank of Scotland Group Plc (RBS) and Credit Suisse took second and third place, respectively, while Goldman Sachs took the eighth spot in the rankings, which were released today.

Valerie Gastaldy, a technical strategist and partner at Day By Day who studies charts of trading patterns to predict price changes, decides which stocks and industries to favor. A team of five analysts assist her. She said that cutting losses early is a central part of her strategy.