California is becoming a battleground state in the fight over health insurance mega-mergers.
Consumer advocates are putting pressure on regulators in California and a dozen other key states to scrutinize the deals amid concerns that consumers will be left with fewer choices and higher costs.
There's a lot at stake for families and employers if the deals go through and leave three health insurers in control of nearly half of the U.S. commercial insurance market.
Anthem Inc. is trying to buy Cigna Corp. for $54.2 billion, and Aetna Inc. wants to take over rival Humana for $37 billion. Anthem and Aetna would join UnitedHealth Group Inc. atop the industry. Another deal,...