UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. 4)

BSQUARE Corporation

(Name of Issuer)

Common Stock, no par value

(Title of Class of Securities)

11776U300

(CUSIP Number)

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)

* 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).

EXPLANATORY NOTE

This Schedule 13G is filed by Wells Fargo & Company on its own behalf and on behalf of any subsidiaries listed on Attachment A. Aggregate beneficial ownership reported by Wells Fargo & Company under Item 9 on page 2 is on a consolidated basis and includes any beneficial ownership separately reported herein by a subsidiary.

13G

CUSIP NO. 11776U300

1	NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) Wells Fargo & Company Tax Identification No. 41-0449260
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a)  ¨ (b)  ¨
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

NUMBER OF   SHARES   BENEFICIALLY   OWNED BY   EACH   REPORTING   PERSON   WITH	5    SOLE VOTING POWER
	6    SHARED VOTING POWER
	7    SOLE DISPOSITIVE POWER
	8    SHARED DISPOSITIVE POWER

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES Not applicable
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 Five percent or less
12	TYPE OF REPORTING PERSON HC

2

13G

CUSIP NO. 11776U300

1	NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) Wells Capital Management Incorporated Federal ID No. 95-3692822
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a)  ¨ (b)  ¨
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION California

NUMBER OF   SHARES   BENEFICIALLY   OWNED BY   EACH   REPORTING   PERSON   WITH	5    SOLE VOTING POWER
	6    SHARED VOTING POWER
	7    SOLE DISPOSITIVE POWER
	8    SHARED DISPOSITIVE POWER

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES Not applicable
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 Five percent or less
12	TYPE OF REPORTING PERSON IA

3

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. 4)

DISCLAIMER: Information in this Schedule 13G is provided solely for the purpose of complying with Sections 13(d) and 13(g) of the Act and regulations promulgated thereunder, and is not to be construed as an admission that Wells Fargo & Company or any of its subsidiaries is the beneficial owner of the securities covered by this Schedule 13G for any purpose whatsoever.

Item 1(a)	Name of Issuer:
	BSQUARE Corporation
Item 1(b)	Address of Issuer’s Principal Executive Offices:
	3150 139th Avenue SE, Suite 500
	Bellevue, WA 98005
Item 2(a)	Name of Person Filing:
	Wells Fargo & Company
	Wells Capital Management Incorporated
Item 2(b)	Address of Principal Business Office or, if None, Residence:
	1.      Wells Fargo & Company
	420 Montgomery Street
	San Francisco, CA 94104
	2.      Wells Capital Management Incorporated
	525 Market Street, 10th Floor
	San Francisco, CA 94104
Item 2(c)	Citizenship:
	1.      Wells Fargo & Company: Delaware
	2.      Wells Capital Management Incorporated: California
Item 2(d)	Title of Class of Securities:
	Common Stock, no par value
Item 2(e)	CUSIP Number:
	11776U300
Item 3	The person filing is a:
	1.      Wells Fargo & Company: Parent Holding Company in accordance with 240.13d-1(b)(1)(ii)(G)

4

	2.      Wells Capital Management Incorporated: Registered Investment Advisor in accordance with Regulation 13d-1(b)(1)(ii)(E)
Item 4	Ownership:
	Not applicable.
Item 5	Ownership of Five Percent or Less of a Class:
	If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following  x.
Item 6	Ownership of More than Five Percent on Behalf of Another Person:
	Not applicable.
Item 7	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company:
	See Attachment A
Item 8	Identification and Classification of Members of the Group:
	Not Applicable.
Item 9	Notice of Dissolution of Group:
	Not Applicable
Item 10	Certification:
	Not applicable.

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: December 13, 2006

WELLS FARGO & COMPANY
By:	/s/ Mark B. Kraske
	Mark B. Kraske, VP Trust Operations Management Support Services

5

ATTACHMENT A

The Schedule 13G to which this attachment is appended is filed by Wells Fargo & Company on behalf of the following subsidiaries:

Wells Capital Management Incorporated (1)

Wells Fargo Bank, National Association (2)

(1) Classified as a registered investment advisor in accordance with Regulation 13d-1(b)(1)(ii)(E).

(2) Classified as a bank in accordance with Regulation 13d-1(b)(1)(ii)(B).

6