Apollo Global Management and Hudson Executive Capital have agreed to acquire Cardtronics, a Houston-based operator of ATM machines, for $35 per share in cash in a deal that values the company at $2.3b, including debt. The purchase price marks a 35% premium to Cardtronics' closing price Dec. 8, the final day before a joint offer was announced. The deal comes after Apollo and Hudson offered to buy the company for $31 per share.