NB Bancorp, Inc. (NASDAQ:NBBK - Get Free Report) was the target of a large increase in short interest in the month of March. As of March 31st, there was short interest totaling 1,785,635 shares, an increase of 18.6% from the March 15th total of 1,505,269 shares. Based on an average trading volume of 244,066 shares, the short-interest ratio is presently 7.3 days. Approximately 4.2% of the company's shares are short sold.