BankUnited, the Florida bank now owned by private equity firms, is planning an initial public offering of stock, people familiar with the matter said.

The Miami Lakes bank collapsed last year under the weight of soured real-estate loans and was sold by the Federal Deposit Insurance Corp. to a group of investors led by banker John Kanas and WL Ross & Co. Other investors include Carlyle Group, Blackstone Group and Centerbridge Partners, which together invested $945m in the bank.