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


SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No.  )



	COSTAR GROUP INC
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(Name of Issuer)

	COMMON STOCK
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(Title of Class of Securities)

	22160N109
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(CUSIP Number)

	February 12, 2007
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(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)




CUSIP No........................................................................

	22160N109
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1. Names of Reporting Persons.
I.R.S. Identification Nos. of above persons (entities only).
.................................................................................

	TRANSAMERICA INVESTMENT MANAGEMENT, LLC
	I.R.S. # 06-1564377
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2.  Check the Appropriate Box if a Member of a Group (See Instructions).........

 (a) [   ]

 (b) [ X ]

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3. SEC Use Only.................................................................

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4. Citizenship or Place of Organization.........................................

	DELAWARE USA
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Number of Shares Beneficially Owned by Each Reporting Person With

5. Sole Voting Power............................................................

	785,694
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6. Shared Voting Power..........................................................

	17
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7. Sole Dispositive Power.......................................................

	963,063
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8. Shared Dispositive Power.....................................................

	NONE
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9. Aggregate Amount Beneficially Owned by Each Reporting Person.................

	963,063
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10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares
(See Instructions)

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

	5.09%
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12. Type of Reporting Person (See Instructions)

	IA
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.................................................................................

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Item 1.


 (a) Name of Issuer

	COSTAR GROUP INC

 (b) Address of Issuer's Principal Executive Offices

	2 BETHESDA METRO CENTER
	10TH FLOOR
	BETHESDA MD 20814

Item 2.


 (a) Name of Person Filing

	TRANSAMERICA INVESTMENT MANAGEMENT, LLC

 (b) Address of Principal Business Office or, if none, Residence

	11111 SANTA MONICA BOULEVARD SUITE 820
	LOS ANGELES, CA 90025

 (c) Citizenship

	DELAWARE USA

 (d) Title of Class of Securities

	COMMON STOCK

 (e) CUSIP Number

	22160N109

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:


 (a) [   ] Broker or dealer registered under section 15 of the Act
	(15 U.S.C. 78o).

 (b) [   ] Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

 (c) [   ] Insurance company as defined in section 3(a)(19) of the Act
	(15 U.S.C. 78c).

 (d) [   ] Investment company registered under section 8 of the Investment
	Company Act of 1940 (15 U.S.C 80a-8).

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

 (f) [   ] An employee benefit plan or endowment fund in accordance with
	240.13d-1(b)(1)(ii)(F);

 (g) [   ] A parent holding company or control person in accordance with
	240.13d-1(b)(1)(ii)(G);

 (h) [   ] A savings associations as defined in Section 3(b) of the Federal
	Deposit Insurance Act (12 U.S.C. 1813);

 (i) [   ] A church plan that is excluded from the definition of an investment
	company under section 3(c)(14) of the Investment Company Act of 1940
	(15 U.S.C. 80a-3);

 (j) [   ] Group, in accordance with 240.13d-1(b)(1)(ii)(J).



Item 4. Ownership.


 (a) Amount beneficially owned:

	963,063

 (b) Percent of class:

	5.09%

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


 	(i) Sole power to vote or to direct the vote

		785,694

 	(ii) Shared power to vote or to direct the vote

		17

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

		963,063

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

		NONE

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 [   ].


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


If any other person is known to have the right to receive or the power to direct
the receipt of dividends from, or the proceeds from the sale of, such
securities, a statement to that effect should be included in response to this
item and, if such interest relates to more than five percent of the class, such
person should be identified. A listing of the shareholders of an investment
company registered under the Investment Company Act of 1940 or the beneficiaries
of employee benefit plan, pension fund or endowment fund is not required.

	The shares of Common Stock reported on in this statement are owned by
	investment advisory clients of Transamerica Investment Management, LLC,
	and such clients have the right to receive dividends from and proceeds
	from the sale of such shares. To Transamerica's knowledge, the interest
	of no one of these clients relates to more than 5% of the class.


Item 7. Identification and Classification of the Subsidiary Which Acquired the
Security Being Reported on By the Parent Holding Company or Control Person.


If a parent holding company or Control person has filed this schedule, pursuant
to Rule 13d-1(b)(1)(ii)(G), so indicate under Item 3(g) and attach an exhibit
stating the identity and the Item 3 classification of the relevant subsidiary.
If a parent holding company or control person has filed this schedule pursuant
to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification
of the relevant subsidiary.

	Not applicable.

Item 8. Identification and Classification of Members of the Group


If a group has filed this schedule pursuant to 240.13d-1(b)(1)(ii)(J), so
indicate under Item 3(j) and attach an exhibit stating the identity and Item 3
classification of each member of the group. If a group has filed this schedule
pursuant to 240.13d-1(c) or 240.13d-1(d), attach an exhibit stating the identity
of each member of the group.

	Not applicable.

Item 9. Notice of Dissolution of Group


Notice of dissolution of a group may be furnished as an exhibit stating the date
of the dissolution and that all further filings with respect to transactions in
the security reported on will be filed, if required, by members of the group, in
their Individual capacity. See Item 5.

	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
________________________________
Date

	By:/s/ Gary U. Rolle
_______________________________
Signature

	Chief Investment Officer
________________________________
Name/Title