SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                  -------------

                                  SCHEDULE 13D*
                                 (Rule 13d-101)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                  RULE 13d-2(a)

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

                         THE HOUSTON EXPLORATION COMPANY
--------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $0.01 Par Value
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    442120101
--------------------------------------------------------------------------------
                                 (CUSIP Number)

                              Marc Weingarten, Esq.
                            Schulte Roth & Zabel LLP
                                919 Third Avenue
                            New York, New York 10022
                                 (212) 756-2000
--------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                 February 8, 2006
--------------------------------------------------------------------------------
                          (Date of Event which Requires
                            Filing of This Statement)

         If the filing person has previously filed a statement on Schedule 13G
to report the acquisition that is the subject of this Schedule 13D, and is
filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the
following box. [ ]

         NOTE: Schedules filed in paper format shall include a signed original
and five copies of the schedule, including all exhibits. See Rule 13d-7 for
other parties to whom copies are to be sent.

                         (Continued on following pages)

                               (Page 1 of 7 Pages)
--------------------------

   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 disclosures provided in a prior cover page.

   The information required on 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).




------------------------------                             --------------------
CUSIP NO.      442120101              SCHEDULE 13D         PAGE 2 OF 7 PAGES
------------------------------                             --------------------

-------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                                JANA PARTNERS LLC
-------------------------------------------------------------------------------
    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*       (a) [ ]
                                                                    (b) [ ]

-------------------------------------------------------------------------------
    3       SEC USE ONLY

-------------------------------------------------------------------------------
    4       SOURCE OF FUNDS*

            AF
-------------------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED PURSUANT
            TO ITEM 2(d) or 2(e)                                         [ ]

-------------------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION

            Delaware
-------------------------------------------------------------------------------
                         7      SOLE VOTING POWER

                                2,853,900 (including 1,987,000 shares
                                        underlying options)
                      ---------------------------------------------------------
 NUMBER OF               8      SHARED VOTING POWER
 SHARES
BENEFICIALLY                    -0-
  OWNED BY            ---------------------------------------------------------
    EACH                 9      SOLE DISPOSITIVE POWER
 REPORTING
PERSON WITH                     2,853,900 (including 1,987,000 shares
                                        underlying options)
                      ---------------------------------------------------------
                         10     SHARED DISPOSITIVE POWER

                                -0-
-------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON

                                2,853,900 (including 1,987,000 shares
                                        underlying options)
-------------------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
            CERTAIN SHARES*
                                                                        [ ]
-------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

            9.9%
-------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*

            IA
-------------------------------------------------------------------------------
                     * SEE INSTRUCTIONS BEFORE FILLING OUT!



------------------------------                             --------------------
CUSIP NO.      442120101              SCHEDULE 13D         PAGE 3 OF 7 PAGES
------------------------------                             --------------------


Item 1.       Security and Issuer.

       This statement on Schedule 13D relates to the shares ("Shares") of common
stock, $0.01 par value, of The Houston Exploration Company (the "Issuer"). The
principal executive office of the Issuer is located at 1100 Louisiana, Suite
2000, Houston, Texas 77002-5215.



Item 2.       Identity and Background.

       (a) This statement is filed by JANA Partners LLC, a Delaware limited
liability company (the "Reporting Person"). The Reporting Person is a private
money management firm which holds the Shares of the Issuer in various accounts
under its management and control. The principals of the Reporting Person are
Barry Rosenstein and Gary Claar (the "Principals").

       (b) The principal business address of the Reporting Person and the
Principals is 200 Park Avenue, Suite 3300, New York, New York 10166.

       (c) The principal business of the Reporting Person and the Principals is
investing for accounts under their management.

       (d) Neither the Reporting Person nor the Principals has, during the last
five years, been convicted in a criminal proceeding (excluding traffic
violations or similar misdemeanors).

       (e) Neither the Reporting Person nor the Principals has, during the last
five years, been a party to a civil proceeding of a judicial or administrative
body of competent jurisdiction and as a result of such proceeding was or is
subject to a judgment, decree or final order enjoining future violations of, or
prohibiting or mandating activities subject to, federal or state securities laws
or finding any violation with respect to such laws.

       (f) The Reporting Person is a limited liability company organized in
Delaware. The Principals are citizens of the United States of America.






------------------------------                             --------------------
CUSIP NO.      442120101              SCHEDULE 13D         PAGE 4 OF 7 PAGES
------------------------------                             --------------------


Item 3.       Source and Amount of Funds or Other Consideration.

       As of the date of this filing, the Reporting Person may be deemed the
beneficial owner of (i) 866,900 Shares outright, (ii) 1,837,000 Shares issuable
upon the exercise of call options with an exercise price of $30.00 per Share,
(iii) 100,000 Shares issuable upon the exercise of call options with an exercise
price of $50.00 per Share and (iii) 50,000 Shares issuable upon the exercise of
call options with an exercise price of $55.00 per Share. The call options are
collectively referred to as "Options." The aggregate purchase price of the
866,900 Shares owned beneficially by the Reporting Person is $49,632,244. Such
Shares were acquired with investment funds in accounts under management.



Item 4        Purpose of Transaction.

       The Reporting Person acquired the Shares for investment in the ordinary
course of business. The Reporting Person believes that the Shares at current
market prices are undervalued and represent an attractive investment
opportunity. The Reporting Person may make further purchases of the Shares from
time to time and may dispose of any or all of the Shares held by it at any time.

       Except as set forth herein, neither the Reporting Person nor the
Principals have any present plan or proposal that would relate to or result in
any of the matters set forth in subparagraphs (a) - (j) of Item 4 of Schedule
13D. The Reporting Person intends to review its investment in the Issuer on a
continuing basis. Depending on various factors including, without limitation,
the Issuer's financial position and strategic direction, price levels of the
Shares, conditions in the securities market and general economic and industry
conditions, the Reporting Person may in the future take such actions with
respect to its investment in the Issuer as it deems appropriate including,
without limitation, purchasing additional Shares or selling some or all of its
Shares, and, alone or with others, pursuing discussions with the Issuer, other
stockholders and third parties with regard to its investment in the Issuer,
and/or otherwise changing its intention with respect to any and all matters
referred to in Item 4 of Schedule 13D.


Item 5.       Interest in Securities of the Company.

       (a) The aggregate percentage of Shares reported to be beneficially owned
by the Reporting Person is based upon 28,847,363 Shares outstanding, which is
the total number of Shares outstanding as of September 30, 2005 as reported in
the Issuer's Quarterly Report on Form 10-Q for the quarter ended September 30,
2005.

       As of the close of business on February 17, 2006, the Reporting Person
may be deemed to beneficially own 2,853,900 Shares (including 1,987,000 shares
underlying options) constituting approximately 9.9% of the Shares outstanding.






------------------------------                             --------------------
CUSIP NO.      442120101              SCHEDULE 13D         PAGE 5 OF 7 PAGES
------------------------------                             --------------------


       (b) The Reporting Person has sole voting and dispositive powers over the
2,853,900 Shares reported herein (assuming exercise of the Options), which
powers are exercised by the Principals.

       (c) Information concerning transactions in the Shares effected
by the Reporting Person during the past sixty days is set forth in Schedule A
hereto and is incorporated herein by reference. All of the transactions in
Shares listed on Schedule A hereto were effected in open market purchases on the
NYSE through various brokerage entities. The Options were purchased on the open
market and in private transactions.

       (d) No person (other than the Reporting 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, the Shares.

       (e) Not applicable.



Item 6.       Contracts, Arrangements, Understandings or Relationships
with Respect to Securities of the Company.

       Except as otherwise set forth herein, the Reporting Person does not have
any contract, arrangement, understanding or relationship with any person with
respect to any securities of the Issuer.



Item 7.       Material to be Filed as Exhibits.

Not applicable






------------------------------                             --------------------
CUSIP NO.      442120101              SCHEDULE 13D         PAGE 6 OF 7 PAGES
------------------------------                             --------------------


                                   SIGNATURES



        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.



Dated:  February 21, 2006



                                           JANA PARTNERS LLC

                                           BY: /s/ Barry Rosenstein
                                           ---------------------------------
                                           Name:  Barry Rosenstein
                                           Title: Managing Partner


                                           BY: /s/ Gary Claar
                                           ---------------------------------
                                           Name:  Gary Claar
                                           Title: Managing Director





------------------------------                             --------------------
CUSIP NO.      442120101              SCHEDULE 13D         PAGE 7 OF 7 PAGES
------------------------------                             --------------------


                                   SCHEDULE A
                        TRANSACTIONS IN THE SHARES BY THE
                    REPORTING PERSON DURING THE PAST 60 DAYS


     Date                   Shares Purchased                  Price Per
of Transaction                   (Sold)                       Share ($)
--------------------------------------------------------------------------
  1/12/2006                      17,800                         53.07
  1/13/2006                      33,700                         53.43
  1/17/2006                      26,100                         55.13
  1/18/2006                      45,000                         54.26
  1/18/2006                      25,000                         54.06
  1/19/2006                      38,900                         55.78
  1/19/2006                         100                         55.92
  1/19/2006                      11,100                         55.04
  1/20/2006                       7,728                         57.63
  1/20/2006                     253,000                         57.02
  1/20/2006                         672                         57.63
  1/20/2006                      22,000                         57.02
  1/20/2006                      75,000                         57.02
  1/23/2006                       2,484                         58.22
  1/23/2006                      63,112                         59.53
  1/23/2006                         216                         58.22
  1/23/2006                       1,976                         60.00
  1/23/2006                       5,488                         59.53
  1/23/2006                      80,000                         59.53
  1/24/2006                      67,724                         59.60
  1/24/2006                       2,484                         59.46
  1/24/2006                         216                         59.46
  1/24/2006                      10,000                         59.60
  1/26/2006                       6,532                         58.37
  1/26/2006                         568                         58.37
   2/1/2006               Options to purchase               30.00 (exercise
                             250,000 shares                price of options)
   2/8/2006               Options to purchase               30.00 (exercise
                             627,700 shares                price of options)
   2/9/2006               Options to purchase               30.00 (exercise
                             370,000 shares                price of options)
   2/9/2006                      70,000                         58.51
   2/9/2006               Options to purchase               55.00 (exercise
                             50,000 shares                 price of options)
  2/10/2006               Options to purchase               30.00 (exercise
                             227,300 shares                price of options)
  2/13/2006               Options to purchase               30.00 (exercise
                             218,000 shares                price of options)
  2/14/2006               Options to purchase               30.00 (exercise
                             144,000 shares                price of options)
  2/15/2006               Options to purchase               50.00 (exercise
                             92,000 shares                 price of options)
  2/15/2006               Options to purchase               50.00 (exercise
                             8,000 shares                  price of options)