Ownership Submission
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 *
Fenton Noel J
  2. Issuer Name and Ticker or Trading Symbol
LoopNet, Inc. [LOOP]
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)
3000 SAND HILL ROAD, BUILDING 4, SUITE 160
3. Date of Earliest Transaction (Month/Day/Year)
04/30/2012
(Street)

MENLO PARK, CA 94025
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
Common Stock 04/30/2012   D   15,000 D (1) 0 I By The Fenton Family Trust
Common Stock 04/30/2012   D   1,446,577 D (1) 0 I By Trinity Ventures IX, L.P. (2)
Common Stock 04/30/2012   D   16,220 D (1) 0 I By Trinity IX Side-By-Side Fund, L.P. (2)
Common Stock 04/30/2012   D   21,577 D (1) 0 I By Trinity IX Entrepreneurs' Fund, L.P. (2)

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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
Stock Option (Right to Buy) $ 19.06 04/30/2012   D     10,500 05/23/2008(3) 05/22/2014 Common Stock 10,500 $ 0 0 I By TVL Management Corporation (4)
Stock Option (Right to Buy) $ 13.18 04/30/2012   D     10,500 05/29/2009(3) 05/28/2015 Common Stock 10,500 $ 0 0 I By TVL Management Corporation (4)
Stock Option (Right to Buy) $ 8.07 04/30/2012   D     10,500 05/28/2010(3) 05/27/2016 Common Stock 10,500 $ 0 0 I By TVL Management Corporation (4)
Stock Option (Right to Buy) $ 10.72 04/30/2012   D     10,500 05/11/2011(3) 05/10/2017 Common Stock 10,500 $ 0 0 I By TVL Management Corporation (4)
Series A Convertible Preferred Stock $ 6.72 04/30/2012   C     9,721 04/14/2009(5)   (6) Common Stock 1,446,577 $ 1,000 0 I By Trinity Ventures IX, L.P. (2)
Series A Convertible Preferred Stock $ 6.72 04/30/2012   C     109 04/14/2009(5)   (6) Common Stock 16,220 $ 1,000 0 I By Trinity IX Side-By-Side Fund, L.P. (2)
Series A Convertible Preferred Stock $ 6.72 04/30/2012   C     145 04/14/2009(5)   (6) Common Stock 21,577 $ 1,000 0 I By Trinity IX Entrepreneurs' Fund, L.P. (2)

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Fenton Noel J
3000 SAND HILL ROAD
BUILDING 4, SUITE 160
MENLO PARK, CA 94025
  X      

Signatures

 /s/ Maria T. Valles, as Attorney-in-Fact   04/30/2012
**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) Disposed of pursuant to a merger agreement, dated April 27, 2011, as amended, between the issuer, CoStar Group, Inc. ("Parent") and Lonestar Acquisition Sub, Inc. (the "Merger Agreement") in exchange for a unit consisting of (i) $16.50 in cash without interest and (ii) 0.03702 shares of the Parent Common Stock per share (the "Merger Consideration").
(2) The Reporting Person is a managing member of Trinity TVL IX, LLC, the General Partner of Trinity Ventures IX, L.P, Trinity IX Side-By-Side Fund, LP and Trinity IX Entrepreneurs' Fund, L.P. The Reporting Person disclaims beneficial ownership of the shares reported, except to the extent of his pecuniary interest therein.
(3) Disposed of pursuant to the Merger Agreement. Pursuant to the Merger Agreement, the options were cancelled in exchange for the Merger Consideration less the exercise price of the option.
(4) This Option is held in the name of TVL Management Corporation, an entity affiliated with Trinity Ventures, a venture capital firm of which the Reporting Person is a general partner.
(5) The Series A Convertible Preferred Stock is convertible at any time, at the Holder's election.
(6) The Series A Convertible Preferred Stock has no expiration date.

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