Bankwell Financial Group, a commercial bank with seven offices in Connecticut, filed on Friday with the SEC to raise up to $50 million in an initial public offering. The New Canaan, CT-based company, which was founded in 2002 and booked $25 million in net interest income for the fiscal year ended December 31, 2013, plans to list on the NASDAQ under the symbol BWFG. Sandler O'Neill is the sole bookrunner on the deal. No pricing terms were disclosed.