Exhibit 99.1 NB Bancorp, Inc. Reports Full Year 2023 Financial Results Investor Contact ● Net income was 9.8millionfor2023,whichwasnegativelyimpactedbythepreviouslymentionedone−timeexpenses,mostsignificantlythe19.1 million expense for the cash and stock contribution to the Needham Bank Charitable Foundation. ● Net income, excluding conversion and IPO-related expenses, was 34.3millionfortheyearendedDecember31,2023.●Bookvalueandtangiblebookvaluepersharewere17.75 and $17 ...