UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. ______)*

Unitil Corporation
(Name of Issuer)


Common Stock
(Title of Class of Securities)

913259107
(CUSIP Number)

12/31/2010
(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:

[X] Rule 13d-1(b)
[ ] Rule 13d-1(c)
[ ] Rule 13d-1(d)

Check the following box if a fee is being paid with this statement [ ].  A fee
is not required only if the filing person: (1) has a previous statement on file
reporting  beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
there to reporting beneficial  ownership of five percent or less of such class.
(See Rule 13d-7).

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be
deemed  to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however,
see the Notes).

1. 	Names of Reporting Persons.
	I.R.S. Identification Nos. of above persons (entities only)

	NSB Advisors LLC

2. 	Check the Appropriate Box if a Member of a Group
	(a) [ ]
	(b) [ ]

3. 	SEC Use Only

4. 	Citizenship or Place of Organization

	State of Maryland

Number of 		5. Sole Voting Power: 0 shares
Shares Beneficially
by 			6. Shared Voting Power: 0 shares
Owned by Each
Reporting 		7. Sole Dispositive Power: 614840 shares
Person With:
			8. Shared Dispositive Power: 0 shares

9. 	Aggregate Amount Beneficially Owned by Each Reporting Person

	614,840 shares

10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares
	[ ]

	not applicable

11.	Percent of Class Represented by Amount in Row (9)

	5.7%

12.	Type of Reporting Person

	IA

Item 1. (a) Name of Issuer

Unitil Corporation

Item 1.	(b) Address of Issuers Principal Executive Offices

6 Liberty Lane West
Hampton, New Hampshire 03842-1720

Item 2. (a) 	Name of Person Filing:

NSB Advisors LLC

Item 2.	(b) 	Address of Principal Business Office:

200 Westage Business Center Drive, Suite 228
Fishkill, NY 12524

Item 2.	(c) 	Citizenship:

USA, Maryland

Item 2.	(d) 	Title of Class of Securities:

Common Stock

Item 2.	(e)  CUSIP: 913259107

Item 3.

	(e) [x]	an Investment Advisor registered under section 203
	of the Investment AdvisersAct of 1940

Item 4. Ownership.

(a)	Amount beneficially owned: 614840 shares

(b)	Percent of class: 5.7%

(c)	Number of shares as to which the person has:

      (i) Sole power to vote or to direct the vote: 0 shares

     (ii) Shared power to vote or to direct the vote: 0 shares

     (iii) Sole power to dispose or to direct the disposition of: 614840 shares

      (iv) Shared power to dispose or to direct the disposition of: 0 shares

Item 5. Ownership of Five Percent or Less of a Class

	not applicable

Item 6. Ownership of More than Five Percent on Behalf of Another Person.

	not applicable

Item 7.
	not applicable

Item 8. Identification and Classification of Members of the Group

	not applicable

Item 9. Notice of Dissolution of Group

	not applicable

Item 10. Certification

By signing below I certify that, to the best of my knowledge and belief, the
securities referred to above were acquired and are held in the ordinary course
of business and 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.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

Date:		1/25/2011

Signature:	WILLIAM F. NICKLIN

Name/Title:	William F. Nicklin / Manager

William F. Nicklin / Manager