CUSIP No. 45684P102                   13G                  Page 1 of 12 Pages

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

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934

                           (Amendment No. _________)*

                           Infrasource Services, Inc.
                                (Name of Issuer)

                    Common Stock, $0.001 par value per share
                         (Title of Class of Securities)

                                    45684P102
                                 (CUSIP Number)

                                  June 13, 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:
     [ ]  Rule 13d-1(b)
     [X] 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 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. 45684P102                   13G                  Page 2 of 12 Pages


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

            GLG Partners LP
-----------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                               (a)  [X]
                                                               (b)  [ ]
-----------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION

            England
-----------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                    2,027,075 shares of Common Stock
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      ______________________________________________________________

PERSON WITH:  (8)   SHARED DISPOSITIVE POWER
                    2,027,075 shares of Common Stock
-----------------------------------------------------------------------
     (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             2,027,075 shares of Common Stock
-----------------------------------------------------------------------
     (10)    CHECK BOX IF THE AGGREGATE AMOUNT
             IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
                                                                    [ ]
-----------------------------------------------------------------------
     (11)    PERCENT OF CLASS REPRESENTED
             BY AMOUNT IN ROW (9)
             5.1%
-----------------------------------------------------------------------
     (12)    TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
             PN
-----------------------------------------------------------------------




CUSIP No. 45684P102                   13G                  Page 3 of 12 Pages

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

            GLG Partners Limited
-----------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                               (a)  [X]
                                                               (b)  [ ]
-----------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION

            England
-----------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                    2,027,075 shares of Common Stock
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      ______________________________________________________________

PERSON WITH:   (8)  SHARED DISPOSITIVE POWER
                    2,027,075 shares of Common Stock
-----------------------------------------------------------------------
     (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             2,027,075 shares of Common Stock
-----------------------------------------------------------------------
     (10)    CHECK BOX IF THE AGGREGATE AMOUNT
             IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
                                                                      [ ]
-----------------------------------------------------------------------
     (11)    PERCENT OF CLASS REPRESENTED
             BY AMOUNT IN ROW (9)
             5.1%
-----------------------------------------------------------------------
     (12)    TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
             OO
-----------------------------------------------------------------------




CUSIP No. 45684P102                   13G                  Page 4 of 12 Pages

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

            Noam Gottesman
-----------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                               (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
                    2,027,075 shares of Common Stock
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      ______________________________________________________________

PERSON WITH:   (8)  SHARED DISPOSITIVE POWER
                    2,027,075 shares of Common Stock
-----------------------------------------------------------------------
     (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             2,027,075 shares of Common Stock
-----------------------------------------------------------------------
     (10)    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
             SHARES (SEE INSTRUCTIONS)
                                                                    [ ]
-----------------------------------------------------------------------
     (11)    PERCENT OF CLASS REPRESENTED
             BY AMOUNT IN ROW (9)
             5.1%
-----------------------------------------------------------------------
     (12)    TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
             IN
-----------------------------------------------------------------------




CUSIP No. 45684P102                   13G                  Page 5 of 12 Pages

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

            Pierre Lagrange
-----------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                               (a)  [X]
                                                               (b)  [ ]
-----------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION

            Belgium
-----------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                    2,027,075 shares of Common Stock
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      ______________________________________________________________

PERSON WITH:   (8)  SHARED DISPOSITIVE POWER
                    2,027,075 shares of Common Stock
-----------------------------------------------------------------------
     (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             2,027,075 shares of Common Stock
-----------------------------------------------------------------------
     (10)    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
             SHARES (SEE INSTRUCTIONS)
                                                                       [ ]
-----------------------------------------------------------------------
     (11)    PERCENT OF CLASS REPRESENTED
             BY AMOUNT IN ROW (9)
             5.1%
-----------------------------------------------------------------------
     (12)    TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
             IN
-----------------------------------------------------------------------




CUSIP No. 45684P102                   13G                  Page 6 of 12 Pages

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

            Emmanuel Roman
-----------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                               (a)  [X]
                                                               (b)  [ ]
-----------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION

            France
-----------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                        2,027,075 shares of Common Stock
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      ______________________________________________________________

PERSON WITH:   (8)  SHARED DISPOSITIVE POWER
                    2,027,075 shares of Common Stock
-----------------------------------------------------------------------
     (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             2,027,075 shares of Common Stock
-----------------------------------------------------------------------
     (10)    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
             SHARES (SEE INSTRUCTIONS)
                                                                       [ ]
-----------------------------------------------------------------------
     (11)    PERCENT OF CLASS REPRESENTED
             BY AMOUNT IN ROW (9)
             5.1%
-----------------------------------------------------------------------
     (12)    TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
             IN
-----------------------------------------------------------------------




CUSIP No. 45684P102                   13G                  Page 7 of 12 Pages

Item 1.

(a)  Name of Issuer

            Infrasource Services, Inc., a Delaware corporation (the "Company").

(b) Address of Issuer's Principal Executive Offices

            100 West Sixth Street'
            Suite 300
            Media, PA 19063

Item 2(a).  Name of Person Filing
Item 2(b).  Address of Principal Business Office or, if none, Residence
Item 2(c).  Citizenship

            GLG Partners LP
            1 Curzon Street
            London W1J 5HB
            England
            Citizenship: England

            GLG Partners Limited
            c/o GLG Partners LP
            1 Curzon Street
            London W1J 5HB
            England
            Citizenship: England

            Noam Gottesman
            c/o GLG Partners LP
            1 Curzon Street
            London W1J 5HB
            England
            Citizenship: United States

            Pierre Lagrange
            c/o GLG Partners LP
            1 Curzon Street
            London W1J 5HB
            England
            Citizenship: Belgium

            Emmanuel Roman
            c/o GLG Partners LP
            1 Curzon Street
            London W1J 5HB
            England
            Citizenship: France

Item 2(d)  Title of Class of Securities

            Common Stock, $0.001 par value per share ("Common Stock")

Item 2(e)  CUSIP Number

            45684P102




CUSIP No. 45684P102                   13G                  Page 8 of 12 Pages

Item 3. If this statement is filed pursuant to ss.ss.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) [ ] An investment adviser in accordance with ss.240.13d-1(b)(1)(ii)(E);

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

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

(h) [ ] A savings association 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 Rule 13d-1(b)(1)(ii)(J).

Item 4.   Ownership

     Provide the following information regarding the aggregate number and
percentage of the class of securities of the issuer identified in Item 1.

     (a) Amount beneficially owned:

         As of the date of this filing, GLG Partners LP, GLG Partners Limited,
Noam Gottesman, Pierre Lagrange and Emmanuel Roman may be deemed the beneficial
owner of (i) 562,000 shares of Common Stock held by GLG North American
Opportunity Fund, (ii) 400,120 shares of Common Stock held by GLG European
Long-Short Fund, (iii) 600,180 shares of Common Stock held by GLG Global
Utilities Fund, (iv) 13,544 shares of Common Stock held by GLG Investments PLC
through its subfund, GLG Balanced Fund, (v) 197,977 shares of Common Stock held
by GLG Investments PLC through its subfund, GLG Capital Appreciation Fund, (vi)
82,700 shares of Common Stock held by GLG Investments PLC through its subfund,
GLG North American Equity Fund, (vii) 64,342 shares of Common Stock held by GLG
Investments IV PLC through its subfund, GLG Capital Appreciation (Distributing)
Fund, (viii) 4,219 shares of Common Stock held by CITI GLG North American Hedge
Fund Ltd., (ix) 6,108 shares of Common Stock held by CITI GLG European Hedge
Fund Ltd., (x) 24,791 shares of Common Stock held by Lyxor/GLG Pan European
Equity Fund Ltd., (xi) 22,163 shares of Common Stock held by Lyxor North
American Alternative Equity Fund Ltd., (xii) 29,878 shares of Common Stock held
by GLG Equities Long-Short CI, (xiii) 5,153 shares of Common Stock held by
Orchestra Sub-funds SPC and (xiv) 13,900 shares of Common Stock held by The
Century Fund SICAV (each entity referred to in (i) through (xiv) is herein
referred to as a "Fund" and, collectively, as the "Funds").




CUSIP No. 45684P102                   13G                  Page 9 of 12 Pages


          GLG Partners LP, an English limited partnership, acts as the
investment manager of each of the Funds and has voting and dispositive power
over the securities held by the Funds. The general partner of GLG Partners LP is
GLG Partners Limited, an English limited company. The shareholders of GLG
Partners Limited are Noam Gottesman, Pierre Lagrange, Philippe Jabre and Lehman
(Cayman) Limited, a subsidiary of Lehman Brothers Holdings, Inc., a
publicly-held entity. The managing directors of GLG Partners Limited are Noam
Gottesman, Pierre Lagrange and Emmanuel Roman, and as a result, each has voting
and dispositive power over the securities held by the Funds. GLG Partners LP,
GLG Partners Limited, Noam Gottesman, Pierre Lagrange and Emmanuel Roman
disclaim beneficial ownership of the securities held by the Funds except for
their pecuniary interest therein.

     (b) Percent of class:

          The Company's most recent quarterly report on Form 10-Q that was filed
on May 4, 2006, indicates there were 39,883,359 shares of Common Stock
outstanding as of April 26, 2006. Therefore, based on the Company's outstanding
shares of Common Stock, the reporting persons may be deemed to beneficially own
5.1% of the outstanding shares of Common Stock of the Company. The foregoing
should not be construed in and of itself as an admission by any Reporting Person
as to beneficial ownership of shares of Common Stock owned by another Reporting
Person.

     (c)

          Number of shares as to which each reporting person has:

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

                0

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

                See Item 4(a) above.

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

                0

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

                See Item 4(a) above.

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

          Not applicable.

Item  7.   Identification and Classification of the Subsidiary Which Acquired





CUSIP No. 45684P102                   13G                  Page 10 of 12 Pages

          the Security Being Reported on by the Parent Holding Company

          Not applicable.

Item 8.  Identification and Classification of Members of the Group

          See Exhibit I.

Item 9.  Notice of Dissolution of Group

          Not applicable.

Item 10. Certification

          By signing below each of the undersigned certifies that, to the best
of its 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.

Exhibits:

Exhibit I: Joint Filing Agreement, dated as of June 21, 2006, by and among GLG
Partners LP, GLG Partners Limited, Noam Gottesman, Pierre Lagrange and Emmanuel
Roman.




CUSIP No. 45684P102                   13G                  Page 11 of 12 Pages

SIGNATURES

          After reasonable inquiry and to the best of its knowledge and belief,
each of the undersigned certifies that the information with respect to it set
forth in this statement is true, complete, and correct.

Dated: June 21, 2006

GLG PARTNERS LIMITED
                                         GLG PARTNERS LP
                                         By: GLG Partners Limited,
/s/ Noam Gottesman                       as its General Partner
-------------------------------
Name: Noam Gottesman
Title: Managing Director

                                          /s/ Noam Gottesman
/s/ Victoria Parry                       --------------------------------
--------------------------------         Name: Noam Gottesman
Name: Victoria Parry                     Title: Managing Director
Title: Senior Legal Counsel

                                          /s/ Victoria Parry
                                         --------------------------------
                                         Name: Victoria Parry
                                         Title: Senior Legal Counsel

PIERRE LAGRANGE                          NOAM GOTTESMAN


/s/ Pierre Lagrange                      /s/ Noam Gottesman
-------------------------------          --------------------------------

EMMANUEL ROMAN


/s/ Emmanuel Roman
-------------------------------




CUSIP No. 45684P102                   13G                  Page 12 of 12 Pages

                                    EXHIBIT I

                             JOINT FILING AGREEMENT

This will confirm the agreement by and among the undersigned that the Schedule
13G filed with the Securities and Exchange Commission on or about the date
hereof with respect to the beneficial ownership by the undersigned of the Common
Stock, $0.001 par value, of Infrasource Services, Inc., a Delaware corporation,
is being filed, and all amendments thereto will be filed, on behalf of each of
the persons and entities named below in accordance with Rule 13d-1(k) under the
Securities Exchange Act of 1934, as amended. This Agreement may be executed in
two or more counterparts, each of which shall be deemed an original, but all of
which together shall constitute one and the same instrument.

Dated as of June 21, 2006

GLG PARTNERS LIMITED
                                         GLG PARTNERS LP
                                         By: GLG Partners Limited,
/s/ Noam Gottesman                       as its General Partner
-------------------------------
Name: Noam Gottesman
Title: Managing Director

                                          /s/ Noam Gottesman
/s/ Victoria Parry                       --------------------------------
--------------------------------         Name: Noam Gottesman
Name: Victoria Parry                     Title: Managing Director
Title: Senior Legal Counsel

                                          /s/ Victoria Parry
                                         --------------------------------
                                         Name: Victoria Parry
                                         Title: Senior Legal Counsel

PIERRE LAGRANGE                          NOAM GOTTESMAN


/s/ Pierre Lagrange                      /s/ Noam Gottesman
-------------------------------          --------------------------------

EMMANUEL ROMAN


/s/ Emmanuel Roman
-------------------------------