30-second summary: Adthena ranks SEM performance for companies across the credit card search landscape. Each brand’s Search Intelligence Scores were calculated by averaging three categories of SEM success including market leadership, search excellence, and brand ownership.  Bank of America top search results with a composite score of 94. U.S. retailer Kroger, ties with American Express and Chase for 2nd spot on their list. Major Credit card issuers struggle as U.S. Bank, Wells Fargo and Discover miss out on the top…