SECURITIES AND EXCHANGE COMMISSION
			   WASHINGTON, DC 20549

				SCHEDULE 13G
				(RULE 13d-102)

		INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
	      TO RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED
			  PURSUANT TO RULE 13d-2(b)
			    (Amendment No. __3___)*

			   Rush Enterprises, Inc.
                              (Name of Issuer)

			    Class B Common Stock
- --------------------------------------------------------------------------------
                       (Title of Class of Securities)

				781846308
- --------------------------------------------------------------------------------
                              (CUSIP Number)

				12/31/2006
- --------------------------------------------------------------------------------
            (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)

         *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 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).





CUSIP NO. 781846308                 13G       	    PAGE  2   OF  5  PAGES


- --------------------------------------------------------------------------------
1. 	NAMES OF REPORTING PERSONS
	I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

		Munder Capital Management
- --------------------------------------------------------------------------------
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP     	(a) [ ]
     	(see instructions)                                 	(b) [ ]
- --------------------------------------------------------------------------------
3.    SEC USE ONLY

- --------------------------------------------------------------------------------
4.    CITIZENSHIP OR PLACE OF ORGANIZATION
      State of Delaware
- --------------------------------------------------------------------------------
                  	5.       SOLE VOTING POWER

      NUMBER OF                     	1,286,934
       SHARES              -----------------------------------------------------
    BENEFICIALLY     	6.       SHARED VOTING POWER
       OWNED BY
        EACH				0
     REPORTING             -----------------------------------------------------
    PERSON WITH         7.       SOLE DISPOSITIVE POWER

					1,296,484
                  	   -----------------------------------------------------
           		8.       SHARED DISPOSITIVE POWER

                        	    	0
- --------------------------------------------------------------------------------
  9.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

	 1,296,484
- --------------------------------------------------------------------------------
 10.     CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
         SHARES (SEE INSTRUCTIONS)                                      [ ]

- --------------------------------------------------------------------------------
 11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

	16.1%
- --------------------------------------------------------------------------------
 12.     TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

	IA
- --------------------------------------------------------------------------------




CUSIP NO. 781846308              13G       	   PAGE  3   OF  5  PAGES


Item 1.

	(a)	Name of Issuer:

		Rush Enterprises, Inc.

	(b)	Address of Issuer's Principal Executive Offices:

		555 I.H. 35 South, Suite 500
		New Braunfels, Texas 78130

Item 2.
	(a)	Name of Person Filing:

		Munder Capital Management ("Munder")

	(b)	Address of Principal Business Office:

		Munder Capital Center
		480 Pierce Street
		Birmingham, MI  48009

	(c)	Citizenship:

		Munder is a general partnership formed under the laws of the
		State of Delaware

	(d)	Title of Class of Securities:

		Class B Common Stock

	(e)	CUSIP Number:

		781846308

Item 3. 	If this statement is filed pursuant to 240.13d-1(b) or
		240.13d-2(b) or (c), check whether the person filing is a:

	(e)	[X]	An investment adviser in accordance with 240.13d-1
			(b)(1)(ii)(E);



CUSIP NO. 781846308                 13G       	   	PAGE  4  OF  5  PAGES


Item 4.		Ownership

	(a)	Amount Beneficially Owned:
			1,296,484 shares (the "Common Stock")

	(b)	Percent of Class
			16.1%

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

		(i)	sole power to vote or direct the vote:
				1,286,934

		(ii)	shared power to vote or direct the vote:
				0

		(iii)	sole power to dispose or to direct the disposition of:
				1,286,934

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

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

		While Munder is the beneficial owner of the shares of Common
		Stock of the Company, Munder is the beneficial owner of such
		stock on behalf of numerous clients who have the right to
		receive and the power to direct the receipt of dividends from,
		or the proceeds of the sale of, such Common Stock.  One client,
		The Munder Small-Cap Value Fund has the right to receive and
		the power to direct the receipt of dividends from, and the
		proceeds from the sale of, more than 5% of the common stock
		(6.2%) of the Issuer. The Munder Small-Cap Value Fund is a
		separate series of Munder Series Trust, an open-end registered
		investment company under the Investment Company Act of 1940.

Item 7.		Identification and Classification of the Subsidiary Which
		Acquired the Security Being Reported on by the Parent
		Holding Company

		Not Applicable.



CUSIP NO. 781846308              13G       	   	PAGE  5  OF  5  PAGES


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.

					February 12, 2007

					MUNDER CAPITAL MANAGEMENT,
					a Delaware general partnership


					By:	/s/ Mary Ann C. Shumaker

					Its:	Associate General Counsel