"A new round of consolidation in the health insurance industry appeared closer as companies seek to grow larger, driven in part by cost-cutting and opportunities that are part of the Affordable Care Act. In the latest jockeying, Humana, the smallest of the big five insurers, is pursuing a deal to sell itself and could reach an agreement by next week ... Among those in the running to buy it are two bigger competitors, Aetna and Cigna."