SECURITIES & EXCHANGE COMMISSION
                             Washington, D.C. 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 13d-2(b)

                                 Illumina, Inc.
                                (Name of Issuer)

                   Common Stock, par value US $0.01 per share
                         (Title of Class of Securities)

                                   452327109
                                 (CUSIP Number)

                                 March 29, 2007
            (Date of event which requires filing of this statement)


     Check the appropriate box to designate the rule pursuant to which
this Schedule 13G is filed:
          [ ]  Rule 13d-1(b)
          [X]  Rule 13d-1(c)
          [ ]  Rule 13d-1(d)





                           (Page 1 of 18 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 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 purposes 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. 452327109                 13G                      Page 2 of 18 Pages
-------------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                               Lone Spruce, L.P.
-------------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                             (a) [X]
                                                             (b) [ ]
-------------------------------------------------------------------------------
     (3)    SEC USE ONLY
-------------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                                Delaware
-------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                 -0-
SHARES         ----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                 48,068
OWNED BY       ----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                                                 -0-
REPORTING      ----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                 48,068
-------------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                                 48,068
-------------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
-------------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                 0.1%
-------------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                                    PN
-------------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 452327109                 13G                      Page 3 of 18 Pages
-------------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                               Lone Balsam, L.P.
-------------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                       (a)  [X]
                                                                       (b)  [ ]
-------------------------------------------------------------------------------
     (3)    SEC USE ONLY
-------------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                                Delaware
-------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                 -0-
SHARES         ----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                 105,481
OWNED BY       ----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                                                 -0-
REPORTING      ----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                 105,481
-------------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                                 105,481
-------------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
-------------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                 0.2%
-------------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                                 PN
-------------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 452327109                 13G                      Page 4 of 18 Pages
-------------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                             Lone Sequoia, L.P.
-------------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                       (a)  [X]
                                                                       (b)  [ ]
-------------------------------------------------------------------------------
     (3)    SEC USE ONLY
-------------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                                Delaware
-------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                 -0-
SHARES         ----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                 88,125
OWNED BY       ----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                                                 -0-
REPORTING      ----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                 88,125
-------------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                                 88,125
-------------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
-------------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                 0.2%
-------------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                                 PN
-------------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 452327109                 13G                      Page 5 of 18 Pages
-------------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                              Lone Cascade, L.P.
-------------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                               (a)  [X]
                                                               (b)  [ ]
-------------------------------------------------------------------------------
     (3)    SEC USE ONLY
-------------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                                Delaware
-------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                 -0-
SHARES         ----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                 1,095,485
OWNED BY       ----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                                                 -0-
REPORTING      ----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                 1,095,485
-------------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                                 1,095,485
-------------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
-------------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                 1.8%
-------------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                                 PN
-------------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!




CUSIP No. 452327109                 13G                      Page 6 of 18 Pages
-------------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                               Lone Sierra, L.P.
-------------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                       (a)  [X]
                                                                       (b)  [ ]
-------------------------------------------------------------------------------
     (3)    SEC USE ONLY
-------------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                                Delaware
-------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                 -0-
SHARES         ----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                 92,168
OWNED BY       ----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                                                 -0-
REPORTING      ----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                 92,168
-------------------------------------------------------------------------------
     (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED
             BY EACH REPORTING PERSON
                                                 92,168
-------------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
-------------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                 0.2%
-------------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                                 PN
-------------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 452327109                 13G                      Page 7 of 18 Pages

-------------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                        Lone Pine Associates LLC
-------------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                       (a)  [X]
                                                                       (b)  [ ]
-------------------------------------------------------------------------------
     (3)    SEC USE ONLY
-------------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                                Delaware
-------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                 -0-
SHARES         ----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                 241,674
OWNED BY       ----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                                                 -0-
REPORTING      ----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                 241,674
-------------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                                 241,674
-------------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
-------------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                 0.4%
-------------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                                 OO
-------------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 452327109                 13G                      Page 8 of 18 Pages

-------------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                          Lone Pine Members LLC
-------------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                               (a)  [X]
                                                               (b)  [ ]
-------------------------------------------------------------------------------
     (3)    SEC USE ONLY
-------------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                                Delaware
-------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                 -0-
SHARES         ----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                 1,187,653
OWNED BY       ----------------------------------------------------------------


EACH           (7)  SOLE DISPOSITIVE POWER
                                                 -0-
REPORTING      ----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                 1,187,653
-------------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                                 1,187,653
-------------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
-------------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                 2.0%
-------------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                                 OO
-------------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 452327109                 13G                      Page 9 of 18 Pages

-------------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                          Lone Pine Capital LLC
-------------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                               (a)  [X]
                                                               (b)  [ ]
-------------------------------------------------------------------------------
     (3)    SEC USE ONLY
-------------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                                Delaware
-------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                 -0-
SHARES         ----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                 2,002,886
OWNED BY       ----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                                                 -0-
REPORTING      ----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                 2,002,886
-------------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                                 2,002,886
-------------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
-------------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                 3.3%
-------------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                                 IA
-------------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 452327109                 13G                     Page 10 of 18 Pages

-------------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO.
            OF ABOVE PERSONS (ENTITIES ONLY)
                                                         Stephen F. Mandel, Jr.
-------------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                       (a)  [X]
                                                                       (b)  [ ]
-------------------------------------------------------------------------------
     (3)    SEC USE ONLY
-------------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                                United States
-------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                 -0-
SHARES         ----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                 3,432,213
OWNED BY       ----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                                                 -0-
REPORTING      ----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                 3,432,213
-------------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                                 3,432,213
-------------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ]
-------------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                 5.7%
-------------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                                 IN
-------------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!





CUSIP No. 452327109                 13G                     Page 11 of 18 Pages

Item 1(a).     Name of Issuer:

     The name of the issuer is Illumina, Inc. (the "Company").

Item 1(b).     Address of Issuer's Principal Executive Offices:

     The Company's principal executive offices are located at 9885 Towne Centre
Drive, San Diego, California 92121-1975.

Item 2(a).     Name of Person Filing:

     This statement is filed by:
          (i) Lone Spruce, L.P., a Delaware limited partnership ("Lone Spruce"),
              with respect to the Common Stock (defined in Item 2(d) below)
              directly owned by it;
         (ii) Lone Balsam, L.P., a Delaware limited partnership ("Lone Balsam"),
              with respect to the Common Stock directly owned by it;
        (iii) Lone Sequoia, L.P., a Delaware limited partnership ("Lone
              Sequoia"), with respect to the Common Stock directly owned by it;
         (iv) Lone Cascade, L.P., a Delaware limited partnership ("Lone
              Cascade"), with respect to the Common Stock directly owned by it;
          (v) Lone Sierra, L.P., a Delaware limited partnership ("Lone Sierra"),
              with respect to the Common Stock directly owned by it;
         (vi) Lone Pine Associates LLC, a Delaware limited liability company
              ("Lone Pine"), with respect to the Common Stock directly owned by
              Lone Spruce, Lone Balsam and Lone Sequoia;
        (vii) Lone Pine Members LLC, a Delaware limited liability company ("Lone
              Pine Members"), with respect to the Common Stock directly owned by
              Lone Cascade and Lone Sierra;
       (viii) Lone Pine Capital LLC, a Delaware limited liability company ("Lone
              Pine Capital"), which serves as investment manager to Lone
              Cypress, Ltd. ("Lone Cypress"), Lone Kauri, Ltd. ("Lone Kauri")
              and Lone Monterey Master Fund, Ltd. ("Lone Monterey Master Fund"),
              each a Cayman Islands exempted company, with respect to the Common
              Stock directly owned by each of Lone Cypress, Lone Kauri and Lone
              Monterey Master Fund;
         (ix) Stephen F. Mandel, Jr. ("Mr. Mandel"), with respect to the Common
              Stock directly owned by each of Lone Spruce, Lone Balsam, Lone
              Sequoia, Lone Cascade, Lone Sierra, Lone Cypress, Lone Kauri and
              Lone Monterey Master Fund.

              The foregoing persons are hereinafter sometimes
         collectively referred to as the "Reporting Persons".  Any






CUSIP No. 452327109                 13G                     Page 12 of 18 Pages

         disclosures herein with respect to persons other than the Reporting
         Persons are made on information and belief after making inquiry to the
         appropriate party.

Item 2(b).     Address of Principal Business Office or, if None, Residence:

     The address of the business office of each of the Reporting Persons is Two
Greenwich Plaza, Greenwich, Connecticut 06830.

Item 2(c).     Citizenship:

     Lone Spruce, Lone Balsam, Lone Sequoia, Lone Cascade and Lone Sierra are
limited partnerships organized under the laws of the State of Delaware. Lone
Pine, Lone Pine Members and Lone Pine Capital are limited liability companies
organized under the laws of the State of Delaware. Mr. Mandel is a United States
citizen.

Item 2(d).     Title of Class of Securities:

     Common Stock, par value US $0.01 per share (the "Common Stock")

Item 2(e).  CUSIP Number:

     452327109





CUSIP No. 452327109                 13G                     Page 13 of 18 Pages

Item 3. If this statement is filed pursuant to Rules 13d-1(b) or 13d-2(b) or
(c), check whether the person filing is a:

          (a)   [ ]  Broker or dealer registered under Section 15 of the Act,

          (b)   [ ]  Bank as defined in Section 3(a)(6) of the Act,

          (c)   [ ]  Insurance Company as defined in Section 3(a)(19) of the
                     Act,

          (d)   [ ]  Investment Company registered under Section 8 of the
                     Investment Company Act of 1940,

          (e)   [ ]  Investment Adviser in accordance with Rule
                     13d-1(b)(1)(ii)(E),

          (f)   [ ]  Employee Benefit Plan or Endowment Fund in accordance
                     with Rule 13d-1(b)(1)(ii)(F),

          (g)   [ ]  Parent Holding Company or control person in accordance
                     with Rule 13d-1(b)(1)(ii)(G),

          (h)   [ ]  Savings Association as defined in Section 3(b) of the
                     Federal Deposit Insurance Act,

          (i)   [ ]  Church Plan that is excluded from the definition of an
                     investment company under Section 3(c)(14) of the
                     Investment Company Act of 1940,

          (j)   [ ]  Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

If this statement is filed pursuant to Rule 13d-1(c), check the box. [X]

Item 4.   Ownership.

         A. Lone Spruce, L.P.
             (a) Amount beneficially owned: 48,068
             (b) Percent of class: 0.1% The percentages used herein and in the
rest of Item 4 are calculated based upon the 60,049,268 Shares issued and
outstanding as of February 1, 2007 as reported in the Company's Form 10-K filed
on February 28, 2007.
             (c)(i) Sole power to vote or direct the vote: -0-
               (ii) Shared power to vote or direct the vote: 48,068
              (iii) Sole power to dispose or direct the disposition: -0-
               (iv) Shared power to dispose or direct the disposition: 48,068





CUSIP No. 452327109                 13G             Page 14 of 18 Pages

         B. Lone Balsam, L.P.
             (a) Amount beneficially owned: 105,481
             (b) Percent of class: 0.2%
             (c)(i) Sole power to vote or direct the vote: -0-
               (ii) Shared power to vote or direct the vote: 105,481
              (iii) Sole power to dispose or direct the disposition: -0-
               (iv) Shared power to dispose or direct the disposition: 105,481

         C.  Lone Sequoia, L.P.
             (a) Amount beneficially owned: 88,125
             (b) Percent of class: 0.2%
             (c)(i) Sole power to vote or direct the vote: -0-
               (ii) Shared power to vote or direct the vote: 88,125
              (iii) Sole power to dispose or direct the disposition: -0-
               (iv) Shared power to dispose or direct the disposition: 88,125

         D. Lone Cascade, L.P.
             (a) Amount beneficially owned: 1,095,485
             (b) Percent of class: 1.8%
             (c)(i) Sole power to vote or direct the vote: -0-
               (ii) Shared power to vote or direct the vote: 1,095,485
              (iii) Sole power to dispose or direct the disposition: -0-
               (iv) Shared power to dispose or direct the disposition: 1,095,485

         E. Lone Sierra, L.P.
             (a) Amount beneficially owned: 92,168
             (b) Percent of class: 0.2%
             (c)(i) Sole power to vote or direct the vote: -0-
               (ii) Shared power to vote or direct the vote: 92,168
              (iii) Sole power to dispose or direct the disposition: -0-
               (iv) Shared power to dispose or direct the disposition: 92,168

         F.  Lone Pine Associates LLC
             (a) Amount beneficially owned: 241,674
             (b) Percent of class: 0.4%
             (c)(i) Sole power to vote or direct the vote: -0-
               (ii) Shared power to vote or direct the vote: 241,674
              (iii) Sole power to dispose or direct the disposition: -0-
               (iv) Shared power to dispose or direct the disposition: 241,674





CUSIP No. 452327109                 13G                    Page 15 of 18 Pages

         G.  Lone Pine Members LLC
             (a) Amount beneficially owned: 1,187,653
             (b) Percent of class: 2.0%
             (c)(i) Sole power to vote or direct the vote: -0-
               (ii) Shared power to vote or direct the vote: 1,187,653
              (iii) Sole power to dispose or direct the disposition: -0-
               (iv) Shared power to dispose or direct the disposition: 1,187,653

         H.  Lone Pine Capital LLC
             (a) Amount beneficially owned: 2,002,886
             (b) Percent of class: 3.3%
             (c)(i) Sole power to vote or direct the vote: -0-
               (ii) Shared power to vote or direct the vote: 2,002,886
              (iii) Sole power to dispose or direct the disposition: -0-
               (iv) Shared power to dispose or direct the disposition: 2,002,886

         I. Stephen F. Mandel, Jr.
             (a) Amount beneficially owned: 3,432,213
             (b) Percent of class: 5.7%
             (c)(i) Sole power to vote or direct the vote: -0-
               (ii) Shared power to vote or direct the vote: 3,432,213
              (iii) Sole power to dispose or direct the disposition: -0-
               (iv) Shared power to dispose or direct the disposition:
                    3,432,213

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.

     Lone Pine, the general partner of Lone Spruce, Lone Sequoia and Lone
Balsam, has the power to direct the affairs of Lone Spruce, Lone Sequoia and
Lone Balsam, including decisions respecting the disposition of the proceeds from
the sale of shares. Lone Pine Members, the general partner of Lone Cascade and
Lone Sierra, has the power to direct the affairs of Lone Cascade and Lone
Sierra, including decisions respecting the disposition of the proceeds from the
sale of shares. Lone Pine Capital, the investment manager of Lone Cypress, Lone
Kauri and Lone Monterey Master Fund, has the power to direct the receipt of
dividends from or the proceeds of the sale of shares held by Lone Cypress, Lone
Kauri and Lone Monterey Master Fund. Mr. Mandel is the Managing Member of each
of Lone Pine, Lone Pine Members and Lone Pine Capital and in that capacity
directs their operations.






CUSIP No. 452327109                 13G             Page 16 of 18 Pages

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

     Not applicable.

Item 8.  Identification and Classification of Members of the Group.

     See Item 2.

Item 9.  Notice of Dissolution of Group.

     Not applicable.

Item 10.  Certification.

     Each of the Reporting Persons hereby makes the following certification:

          By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above 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.






CUSIP No. 452327109                 13G                     Page 17 of 18 Pages

                                   SIGNATURES

         After reasonable inquiry and to the best of our knowledge and belief,
the undersigned certify that the information set forth in this statement is
true, complete and correct.

DATED:  April 9, 2007

                                   By: /s/ Stephen F. Mandel, Jr.
                                       ----------------------------------------
                                       Stephen F. Mandel, Jr., individually and
                                       (a) as Managing Member of Lone Pine
                                       Associates LLC, for itself and as the
                                       general partner of (i) Lone Spruce, L.P.,
                                       (ii) Lone Balsam, L.P. and (iii) Lone
                                       Sequoia, L.P.; (b) as Managing Member of
                                       Lone Pine Members LLC, for itself and as
                                       the general partner of (i) Lone Cascade,
                                       L.P. and (ii) Lone Sierra, L.P.; and (c)
                                       as Managing Member of Lone Pine
                                       Capital LLC





CUSIP No. 452327109                 13G                      Page 18 of 18 Pages


                                    EXHIBIT 1

                         JOINT ACQUISITION STATEMENT
                          PURSUANT TO RULE 13d-1(k)


     The undersigned acknowledge and agree that the foregoing statement on
Schedule 13G, is filed on behalf of each of the undersigned and that all
subsequent amendments to this statement on Schedule 13G, shall be filed on
behalf of each of the undersigned without the necessity of filing additional
joint acquisition statements. The undersigned acknowledge that each shall be
responsible for the timely filing of such amendments, and for the completeness
and accuracy of the information concerning him or it contained therein, but
shall not be responsible for the completeness and accuracy of the information
concerning the others, except to the extent that he or it knows or has reason to
believe that such information is inaccurate.


DATED:  April 9, 2007

                                   By: /s/ Stephen F. Mandel, Jr.
                                       ----------------------------------------
                                       Stephen F. Mandel, Jr., individually and
                                       (a) as Managing Member of Lone Pine
                                       Associates LLC, for itself and as the
                                       general partner of (i) Lone Spruce, L.P.,
                                       (ii) Lone Balsam, L.P. and (iii) Lone
                                       Sequoia, L.P.; (b) as Managing Member of
                                       Lone Pine Members LLC, for itself and as
                                       the general partner of (i) Lone Cascade,
                                       L.P. and (ii) Lone Sierra, L.P.; and (c)
                                       as Managing Member of Lone Pine
                                       Capital LLC