MetLife Inc., the biggest U.S. life insurer, is poised to become the No. 1 reverse-mortgage lender as Wells Fargo & Co. and Bank of America Corp. leave the market. Wells Fargo, the largest U.S. home lender, is retreating from reverse mortgages in part because of “unpredictable home values,” the company said June 16. The reverse mortgage was the most prominently featured product last week on the website of MetLife Bank, a unit that the company said may hedge the parent against declines in the main insurance business.