SCHEDULE 13G/A 0001894571 XXXXXXXX LIVE 1 Common Stock, par value $0.01 per share 12/01/2025 0001979330 NB Bancorp, Inc. 63945M107 1063 Great Plain Avenue Needham MA 02492 Rule 13d-1(c) Pertento Partners LLP X0 0.00 2338987.00 0.00 2338987.00 2338987.00 N 5.1 IA Pertento Advisors LLC DE 0.00 2338987.00 0.00 2338987.00 2338987.00 N 5.1 IA Eduardo Marques D5 0.00 2338987.00 0.00 2338987.00 2338987.00 N 5.1 HC IN NB Bancorp, Inc. 1063 Great Plain Avenue, Needham, Massachusetts 02492 Pertento Partners LLP Pertento Advisors LLC Eduardo Marques Pertento Partners LLP 111 Park Street London W1K7JL United Kingdom Pertento Advisors LLC 111 Park Street London W1K7JL United Kingdom Eduardo Marques 111 Park Street London W1K7JL United Kingdom Pertento Partners LLP - Other - United Kingdom Pertento Advisors LLC - Delaware Eduardo Marques - Other - Brazil Y Pertento Partners LLP - 2,338,987 Pertento Advisors LLC - 2,338,987 Eduardo Marques - 2,338,987 Pertento Partners LLP - 5.1% Pertento Advisors LLC - 5.1% Eduardo Marques - 5.1% Pertento Partners LLP - 0 Pertento Advisors LLC - 0 Eduardo Marques - 0 Pertento Partners LLP - 2,338,987 Pertento Advisors LLC - 2,338,987 Eduardo Marques - 2,338,987 Pertento Partners LLP - 0 Pertento Advisors LLC - 0 Eduardo Marques - 0 Pertento Partners LLP - 2,338,987 Pertento Advisors LLC - 2,338,987 Eduardo Marques - 2,338,987 Y N All of the securities reported in this Schedule 13G are directly owned by advisory clients of Pertento Partners LLP. None of those advisory clients may be deemed to beneficially own more than 5% of the Common Stock, par value $0.01 per share. Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. Material to be Filed as Exhibit: Exhibit A - Joint Filing Agreement Pertento Partners LLP By: /s/ Eduardo Marques 12/05/2025 Pertento Advisors LLC By: /s/ Eduardo Marques 12/05/2025 Eduardo Marques By: /s/ Eduardo Marques 12/05/2025