NBBK ▼ -0.2% - NB Bancorp, Inc. $NBBK - KBRA Assigns Ratings to NB Bancorp, Inc. NBBK fell 0.2% today following KBRA's assignment of ratings to the bancorp. The modest decline suggests the market absorbed the credit agency's initial assessment without major concern, though the specific ratings assigned were not detailed in available reports. 16-SEP-2026 11:46 AM ET