    <SEC-DOCUMENT>0001140361-23-016955-index.html : 20230406
    <SEC-HEADER>0001140361-23-016955.hdr.sgml : 20230406
    <ACCEPTANCE-DATETIME>20230406111816
    ACCESSION NUMBER:		0001140361-23-016955
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		3
    FILED AS OF DATE:		20230406
    DATE AS OF CHANGE:		20230406

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			NBT BANCORP INC
    		CENTRAL INDEX KEY:			0000790359
    		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
    		IRS NUMBER:				161268674
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-14703
    		FILM NUMBER:		23804934

    	BUSINESS ADDRESS:
    		STREET 1:		52 S BROAD ST
    		CITY:			NORWICH
    		STATE:			NY
    		ZIP:			13815
    		BUSINESS PHONE:		6073372265

    	MAIL ADDRESS:
    		STREET 1:		52 S. BROAD STREET
    		CITY:			NORWICH
    		STATE:			NY
    		ZIP:			13815
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>ny20007266x3_defa14a.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: ny20007266x3_defa14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>ny20007266x3_nc01.jpg
    <TEXT>
    Document 2 - file: ny20007266x3_nc01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>ny20007266x3_nc02.jpg
    <TEXT>
    Document 3 - file: ny20007266x3_nc02.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>