After two mergers with Memphis companies in 2016, a West Tennessee accounting firm is dipping into Mississippi for its next move. Alexander Thompson Arnold (ATA), which merged with Revolution Partners and Collins Thomas & Associates last year, is merging with Tupelo-based Ashby & Associates. "We already work with clients in the Tupelo area and look forward to expanding our presence and involvement in the community. We are eager to grow the firm in years to come," ATA partner Stephen Eldridge...