Walmart is in early talks to acquire health insurer Humana, The Wall Street Journal reports. With Humana’s $37 billion market cap, the deal would be Walmart’s biggest ever, surpassing its $10.8 billion Asda buy in 1999. The talks come as Amazon circles health care and the industry increasingly eyes consolidation. If the two firms agreed to merge, the move “would transform Walmart overnight into one of the nation’s largest health insurers” and embed it in a complex and evolving industry, says the Journal.

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