    <SEC-DOCUMENT>0001104659-23-069955-index.html : 20230609
    <SEC-HEADER>0001104659-23-069955.hdr.sgml : 20230609
    <ACCEPTANCE-DATETIME>20230609164832
    ACCESSION NUMBER:		0001104659-23-069955
    CONFORMED SUBMISSION TYPE:	S-1
    PUBLIC DOCUMENT COUNT:		38
    FILED AS OF DATE:		20230609

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			NB Bancorp, Inc.
    		CENTRAL INDEX KEY:			0001979330
    		IRS NUMBER:				000000000
    		STATE OF INCORPORATION:			MD
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		S-1
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-272567
    		FILM NUMBER:		231006040

    	BUSINESS ADDRESS:
    		STREET 1:		1063 GREAT PLAIN AVENUE
    		CITY:			NEEDHAM
    		STATE:			MA
    		ZIP:			02492
    		BUSINESS PHONE:		617-387-1110

    	MAIL ADDRESS:
    		STREET 1:		1063 GREAT PLAIN AVENUE
    		CITY:			NEEDHAM
    		STATE:			MA
    		ZIP:			02492
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>S-1
    <SEQUENCE>1
    <FILENAME>tm2318040d1_s1.htm
    <DESCRIPTION>FORM S-1
    <TEXT>
    Document 1 - file: tm2318040d1_s1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-1.1
    <SEQUENCE>2
    <FILENAME>tm2318040d1_ex1-1.htm
    <DESCRIPTION>EXHIBIT 1.1
    <TEXT>
    Document 2 - file: tm2318040d1_ex1-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-1.2
    <SEQUENCE>3
    <FILENAME>tm2318040d1_ex1-2.htm
    <DESCRIPTION>EXHIBIT 1.2
    <TEXT>
    Document 3 - file: tm2318040d1_ex1-2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-2
    <SEQUENCE>4
    <FILENAME>tm2318040d1_ex2.htm
    <DESCRIPTION>EXHIBIT 2
    <TEXT>
    Document 4 - file: tm2318040d1_ex2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-3.1
    <SEQUENCE>5
    <FILENAME>tm2318040d1_ex3-1.htm
    <DESCRIPTION>EXHIBIT 3.1
    <TEXT>
    Document 5 - file: tm2318040d1_ex3-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-3.2
    <SEQUENCE>6
    <FILENAME>tm2318040d1_ex3-2.htm
    <DESCRIPTION>EXHIBIT 3.2
    <TEXT>
    Document 6 - file: tm2318040d1_ex3-2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-4
    <SEQUENCE>7
    <FILENAME>tm2318040d1_ex4.htm
    <DESCRIPTION>EXHIBIT 4
    <TEXT>
    Document 7 - file: tm2318040d1_ex4.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-5
    <SEQUENCE>8
    <FILENAME>tm2318040d1_ex5.htm
    <DESCRIPTION>EXHIBIT 5
    <TEXT>
    Document 8 - file: tm2318040d1_ex5.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.1
    <SEQUENCE>9
    <FILENAME>tm2318040d1_ex10-1.htm
    <DESCRIPTION>EXHIBIT 10.1
    <TEXT>
    Document 9 - file: tm2318040d1_ex10-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.2
    <SEQUENCE>10
    <FILENAME>tm2318040d1_ex10-2.htm
    <DESCRIPTION>EXHIBIT 10.2
    <TEXT>
    Document 10 - file: tm2318040d1_ex10-2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.3
    <SEQUENCE>11
    <FILENAME>tm2318040d1_ex10-3.htm
    <DESCRIPTION>EXHIBIT 10.3
    <TEXT>
    Document 11 - file: tm2318040d1_ex10-3.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.4
    <SEQUENCE>12
    <FILENAME>tm2318040d1_ex10-4.htm
    <DESCRIPTION>EXHIBIT 10.4
    <TEXT>
    Document 12 - file: tm2318040d1_ex10-4.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.5
    <SEQUENCE>13
    <FILENAME>tm2318040d1_ex10-5.htm
    <DESCRIPTION>EXHIBIT 10.5
    <TEXT>
    Document 13 - file: tm2318040d1_ex10-5.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.6
    <SEQUENCE>14
    <FILENAME>tm2318040d1_ex10-6.htm
    <DESCRIPTION>EXHIBIT 10.6
    <TEXT>
    Document 14 - file: tm2318040d1_ex10-6.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.7
    <SEQUENCE>15
    <FILENAME>tm2318040d1_ex10-7.htm
    <DESCRIPTION>EXHIBIT 10.7
    <TEXT>
    Document 15 - file: tm2318040d1_ex10-7.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-16
    <SEQUENCE>16
    <FILENAME>tm2318040d1_ex16.htm
    <DESCRIPTION>EXHIBIT 16
    <TEXT>
    Document 16 - file: tm2318040d1_ex16.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-21
    <SEQUENCE>17
    <FILENAME>tm2318040d1_ex21.htm
    <DESCRIPTION>EXHIBIT 21
    <TEXT>
    Document 17 - file: tm2318040d1_ex21.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-23.2
    <SEQUENCE>18
    <FILENAME>tm2318040d1_ex23-2.htm
    <DESCRIPTION>EXHIBIT 23.2
    <TEXT>
    Document 18 - file: tm2318040d1_ex23-2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-23.3
    <SEQUENCE>19
    <FILENAME>tm2318040d1_ex23-3.htm
    <DESCRIPTION>EXHIBIT 23.3
    <TEXT>
    Document 19 - file: tm2318040d1_ex23-3.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>20
    <FILENAME>tm2318040d1_ex99-1.htm
    <DESCRIPTION>EXHIBIT 99.1
    <TEXT>
    Document 20 - file: tm2318040d1_ex99-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>21
    <FILENAME>tm2318040d1_ex99-2.htm
    <DESCRIPTION>EXHIBIT 99.2
    <TEXT>
    Document 21 - file: tm2318040d1_ex99-2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.3
    <SEQUENCE>22
    <FILENAME>tm2318040d1_ex99-3.htm
    <DESCRIPTION>EXHIBIT 99.3
    <TEXT>
    Document 22 - file: tm2318040d1_ex99-3.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.6
    <SEQUENCE>23
    <FILENAME>tm2318040d1_ex99-6.htm
    <DESCRIPTION>EXHIBIT 99.6
    <TEXT>
    Document 23 - file: tm2318040d1_ex99-6.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-FILING FEES
    <SEQUENCE>24
    <FILENAME>tm2318040d1_ex-filingfees.htm
    <DESCRIPTION>EXHIBIT 107
    <TEXT>
    Document 24 - file: tm2318040d1_ex-filingfees.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>25
    <FILENAME>tm2318040d1_ex1-1img001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 25 - file: tm2318040d1_ex1-1img001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>26
    <FILENAME>tm2318040d1_ex23-2image001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 26 - file: tm2318040d1_ex23-2image001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>27
    <FILENAME>tm2318040d1_ex23-2image002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 27 - file: tm2318040d1_ex23-2image002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>28
    <FILENAME>tm2318040d1_ex99-1img001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 28 - file: tm2318040d1_ex99-1img001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>29
    <FILENAME>tm2318040d1_ex99-1img002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 29 - file: tm2318040d1_ex99-1img002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>30
    <FILENAME>tm2318040d1_ex99-3img005.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 30 - file: tm2318040d1_ex99-3img005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>31
    <FILENAME>tm2318040d1_ex99-3img006.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 31 - file: tm2318040d1_ex99-3img006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>32
    <FILENAME>tm2318040d1_ex99-3img007.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 32 - file: tm2318040d1_ex99-3img007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>33
    <FILENAME>tm2318040d1_ex99-3img01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 33 - file: tm2318040d1_ex99-3img01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>34
    <FILENAME>tm2318040d1_ex99-3sp6img001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 34 - file: tm2318040d1_ex99-3sp6img001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>35
    <FILENAME>tm2318040d1_ex99-6img001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 35 - file: tm2318040d1_ex99-6img001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>36
    <FILENAME>tm2318040d1_prospectusimg001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 36 - file: tm2318040d1_prospectusimg001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>37
    <FILENAME>tm2318040d1ex99-3img003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 37 - file: tm2318040d1ex99-3img003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>38
    <FILENAME>tm2318040d1ex99-3img004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 38 - file: tm2318040d1ex99-3img004.jpg

    </DOCUMENT>
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