FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * GUMBLE WILLIAM C   2. Issuer Name and Ticker or Trading Symbol NBT BANCORP INC [NBTB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 52 SOUTH BROAD STREET 3. Date of Earliest Transaction (Month/Day/Year) 12/31/2005 (Street) NORWICH, NY 13815 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price NBT Bancorp Inc. Common Stock 12/31/2005   M   1,500 A $ 16.0625 103,432 D   NBT Bancorp Inc. Common Stock 12/31/2005   M   1,200 A $ 14.3492 104,632 D   NBT Bancorp Inc. Common Stock 12/31/2005   M   900 A $ 17.6008 105,532 D

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Non-Qualified Stock Option (right to buy)

$ 14.3492

12/31/2005

M

1,200

01/28/2003(1)

01/28/2012

NBT Bancorp Inc. Common Stock

1,200

$ 0

300

D

Non-Qualified Stock Option (right to buy)

$ 16.0625

12/31/2005

M

1,500

01/22/2002(1)

01/22/2011

NBT Bancorp Inc. Common Stock

1,500

$ 0

0

D

Non-Qualified Stock Option (right to buy)

$ 17.6008

12/31/2005

M

900

01/01/2004(1)

01/01/2013

NBT Bancorp Inc. Common Stock

900

$ 0

600

D

Non-Qualified Stock Option (right to buy)

$ 22.4092

12/31/2005

A

1,500

12/31/2007(2)

12/31/2015

NBT Bancorp Inc. Common Stock

1,500

$ 0

1,500

D

Non-Qualified Stock Option (right to buy)

$ 22.4092

12/31/2005

A

1,200

12/31/2007(2)

12/31/2015

NBT Bancorp Inc. Common Stock

1,200

$ 0

2,700

D

Non-Qualified Stock Option (right to buy)

$ 22.4092

12/31/2005

A

900

12/31/2007(2)

12/31/2015

NBT Bancorp Inc. Common Stock

900

$ 0

3,600

D

Non-Qualified Stock Option (right to buy)

$ 20.7492

05/01/2006(1)

05/01/2015

NBT Bancorp Inc. Common Stock

1,500

1,500

D

Non-Qualified Stock Option (right to buy)

$ 22.1388

01/01/2005(1)

01/01/2014

NBT Bancorp Inc. Common Stock

1,500

1,500

D

Non-Qualified Stock Option (right to buy)

$ 23.2708

01/20/2006(1)

01/20/2015

NBT Bancorp Inc. Common Stock

588

588

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
GUMBLE WILLIAM C 52 SOUTH BROAD STREET NORWICH, NY 13815	X

Signatures

By: Michael J. Chewens, Power of Attorney For: William C. Gumble		01/03/2006
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Pursuant to NBT Non-Employee Director, Divisional Director and Subsidiary Director Stock Option Plan grant vests 40% for first year, 20% annually for following years.
(2)	Pursuant to NBT Non-Employee Director, Divisional Director and Subsidiary Director Stock Option Plan reload grant vests 100% two years after date of its grant.

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