SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G
                                  Rule 13d-102

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

                      Compass Minerals International Inc.
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                                (Name of Issuer)

                                     common
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                         (Title of Class of Securities)

                                   20451N101
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                                 (CUSIP Number)

                                   05/31/2009
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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)

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      * 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).

Page 1 of 7 Pages


CUSIP No. 20451N101
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(1) Names of reporting persons.

    Neuberger Berman Group LLC
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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
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Number of shares beneficially owned by each reporting person with:

    (5) Sole voting power:
        22284

    (6) Shared voting power:
        3629400

    (7) Sole dispositive power:
        0

    (8) Shared dispositive power:
        4360170

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(9) Aggregate amount beneficially owned by each reporting person.

    4360170
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(10) Check if the aggregate amount in Row (9) excludes certain shares       |X|
     (see instructions).
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(11) Percent of class represented by amount in Row 9.

     13.385%
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(12) Type of reporting person (see instructions).

     HC
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Page 2 of 7 Pages


CUSIP No. 20451N101
--------------------------------------------------------------------------------
(1) Names of reporting persons.

    Neuberger Berman LLC
--------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a group (see instructions)   (a)|_|
                                                                          (b)|X|
--------------------------------------------------------------------------------
(3) SEC use only.

--------------------------------------------------------------------------------
(4) Citizenship or place of organization.

    Delaware
--------------------------------------------------------------------------------
Number of shares beneficially owned by each reporting person with:

    (5) Sole voting power:
        22284

    (6) Shared voting power:
        3629400

    (7) Sole dispositive power:
        0

    (8) Shared dispositive power:
        4360170

--------------------------------------------------------------------------------
(9) Aggregate amount beneficially owned by each reporting person.

    4360170
--------------------------------------------------------------------------------
(10) Check if the aggregate amount in Row (9) excludes certain shares       |X|
     (see instructions).
--------------------------------------------------------------------------------
(11) Percent of class represented by amount in Row 9.

     13.385%
--------------------------------------------------------------------------------
(12) Type of reporting person (see instructions).

     BD        IA
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Page 3 of 7 Pages


CUSIP No. 20451N101
--------------------------------------------------------------------------------
(1) Names of reporting persons.

    Neuberger Berman Management LLC
--------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a group (see instructions)   (a)|_|
                                                                          (b)|X|
--------------------------------------------------------------------------------
(3) SEC use only.

--------------------------------------------------------------------------------
(4) Citizenship or place of organization.

    Delaware
--------------------------------------------------------------------------------
Number of shares beneficially owned by each reporting person with:

    (5) Sole voting power:
        0

    (6) Shared voting power:
        3629400

    (7) Sole dispositive power:
        0

    (8) Shared dispositive power:
        3629400

--------------------------------------------------------------------------------
(9) Aggregate amount beneficially owned by each reporting person.

    3629400
--------------------------------------------------------------------------------
(10) Check if the aggregate amount in Row (9) excludes certain shares       |_|
     (see instructions).
--------------------------------------------------------------------------------
(11) Percent of class represented by amount in Row 9.

     11.142%
--------------------------------------------------------------------------------
(12) Type of reporting person (see instructions).

     BD        IA
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Page 4 of 7 Pages


CUSIP No. 20451N101
--------------------------------------------------------------------------------
(1) Names of reporting persons.

    Neuberger Berman Equity Funds
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(2) Check the appropriate box if a member of a group (see instructions)   (a)|_|
                                                                          (b)|X|
--------------------------------------------------------------------------------
(3) SEC use only.

--------------------------------------------------------------------------------
(4) Citizenship or place of organization.

    Delaware
--------------------------------------------------------------------------------
Number of shares beneficially owned by each reporting person with:

    (5) Sole voting power:
        0

    (6) Shared voting power:
        3615700

    (7) Sole dispositive power:
        0

    (8) Shared dispositive power:
        3615700

--------------------------------------------------------------------------------
(9) Aggregate amount beneficially owned by each reporting person.

    3615700
--------------------------------------------------------------------------------
(10) Check if the aggregate amount in Row (9) excludes certain shares       |_|
     (see instructions).
--------------------------------------------------------------------------------
(11) Percent of class represented by amount in Row 9.

     11.099%
--------------------------------------------------------------------------------
(12) Type of reporting person (see instructions).

     IV
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Page 5 of 7 Pages


Item 1(a). Name of Issuer:

           Compass Minerals International Inc.

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

           9900 West 109th Street
           Suite 600
           Overland Park, KS 66210

Item 2(a). Name of Person Filing:

           Neuberger Berman Group LLC
           Neuberger Berman LLC
           Neuberger Berman Management LLC
           Neuberger Berman Equity Funds

           Neuberger Berman Group LLC ("NBG") makes this filing on behalf of
           itself and its direct and indirect affiliates, including, Neuberger
           Berman Holdings LLC, formerly known as Neuberger Berman Inc. ("NBI").
           NBI and its subsidiaries, Neuberger Berman LLC and Neuberger Berman
           Management LLC, became subsidiaries of NBG following the sale of
           certain assets formerly owned by Lehman Brothers Holdings Inc.

           Please note that in connection with sale described above, certain
           disclosures required under Section 13(d) of the Securities Exchange
           Act of 1934, as amended, that were filed by NBI under SEC Central
           Index Key (CIK) number (#0001068144) will now be filed under NBG's
           CIK number (#0001465109).

           This statement is filed by: (i) Neuberger Berman Group LLC with
           respect to shares of the issuer's common stock ("Shares"),
           beneficially owned by Neuberger Berman LLC and certain affiliated
           persons; (ii) Neuberger Berman LLC with respect to Shares
           beneficially owned by certain affiliated persons; (iii) and Neuberger
           Berman Management LLC with respect to Shares beneficially owned by
           certain affiliated persons.

           Neuberger Berman Group LLC, Neuberger Berman LLC and Neuberger
           Management LLC have entered into a Joint Filing Agreement, a copy of
           which is filed with this Schedule 13G as Exhibit 99.1, pursuant to
           which they have agreed to file this Schedule 13G jointly in
           accordance with the provisions of Rule 13d-1(k) of the Securities
           Exchange Act of 1934, as amended.

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

           605 3rd Avenue
           New York, New York 10158

Item 2(c). Citizenship:

           Delaware

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

           common

Item 2(e). CUSIP No.:

           20451N101

Item 3. If This Statement is Filed Pursuant to Rule 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
                (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 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) |X| Group, in accordance with ss. 240.13d-1(b)(1)(ii)(J).

        If this statement is filed pursuant to Rule 13d-1(c),
        check this box. |_|

Item 4. Ownership

    (a) Amount beneficially owned:
        4360170 (1)

    (b) Percent of class:
        13.385

    (c) Number of shares as to which such person has:
        (i)   Sole power to direct the vote
              22284

        (ii)  Shared power to direct the vote
              3629400

        (iii) Sole power to dispose or direct the disposition of
              0

        (iv)  Shared power to dispose or direct the disposition of
              4360170

Item 5. Ownership of 5 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 5 percent of the class of  securities, check the following |_|

Item 6. Ownership of More than 5 Percent on Behalf of Another Person.

        Neuberger Berman Group LLC may be deemed to be a beneficial owner of
        securities for purposes of Rule 13d-3 because certain affiliated persons
        have shared power to retain or dispose of, and in some cases the sole
        power to vote, the securities of many unrelated clients.  Neuberger
        Berman Group LLC or its affiliated persons do not, however, have any
        economic interest in the securities of those clients.  The clients are
        the actual owners of the securities and have the sole right to receive
        and the power to direct the receipt of dividends from or proceeds from
        the sale of such securities.  No one client has an interest of more than
        5% of the issuer.

        With regard to the Shares set forth under item 4(c)(II), Neuberger
        Berman Group LLC may be deemed to be the beneficial owner for purposes
        of Rule 13d-3 because certain affiliated persons have shared power
        retain, dispose of and vote the securities.  Each of Neuberger Berman
        LLC and Neuberger Berman Management LLC serve as a sub-adviser and
        investment manager, respectively, of Neuberger Berman Group LLC's
        various registered mutual funds which hold such Shares in the ordinary
        course of their business and not with the purpose nor with the effect of
        changing or influencing the control of the issuer. The holdings of
        Neuberger Berman Fixed Income LLC and NB Alternative Fund Management
        LLC, affiliates of Neuberger Berman LLC, are also aggregated to comprise
        the holdings referenced herein.

        It should be further noted that the Share calculation under item
        4(c)(IV) is derived from a total combination of the Shares set forth
        under Item 4(c)(I and II).  The remaining balance of Shares, if any, are
        for the individual client accounts over which Neuberger Berman LLC has
        shared power to dispose but not vote Shares.

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

        N/A

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

        N/A

Item 9. Notice of Dissolution of Group.

        N/A

Item 10. Certifications

         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.


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1. Neuberger Berman Group LLC, Neuberger Berman LLC, Neuberger Berman
   Management LLC and certain affiliated persons own directly no Shares.  As
   investment advisers, certain affiliated persons that are controlled by
   Neuberger Berman Group LLC have investment and voting powers with respect to
   the Shares held.

   Neuberger Berman Group LLC, through its direct and indirect subsidiary
   Neuberger Berman Holdings LLC, controls Neuberger Berman LLC and certain
   affiliated persons.  By reason of the provisions of Rule 13d-3 of the
   Securities Exchange Act of 1934, as amended, Neuberger Berman Group LLC may
   be deemed to own beneficially 4,360,170 Shares while Neuberger Berman LLC and
   Neuberger Berman Management LLC may be deemed to own beneficially 4,360,170
   Shares and 3,629,400 Shares constituting approximately 13.385% and 11.142%,
   respectively, of the Shares outstanding.  Each of Neuberger Berman Group LLC,
   Neuberger Berman LLC, Neuberger Berman Management LLC and certain affiliated
   persons disclaim beneficial ownership of any of the securities covered by
   this statement.



Page 6 of 7 Pages


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.

                                      Neuberger Berman Group LLC

Date: 06/10/2009                      /s/ Kevin Handwerker
                                      Name:  Kevin Handwerker
                                      Title: General Counsel


                                      Neuberger Berman LLC

Date: 06/10/2009                      /s/ Kevin Handwerker
                                      Name:  Kevin Handwerker
                                      Title: General Counsel


                                      Neuberger Berman Management LLC

Date: 06/10/2009                      /s/ Robert Conti
                                      Name:  Robert Conti
                                      Title: President


                                      Neuberger Berman Equity Funds

Date: 06/10/2009                      /s/ Robert Conti
                                      Name:  Robert Conti
                                      Title: President and Chief
                                             Executive Officer


The original statement shall be signed by each person on whose behalf the
statement is filed or his authorized representative. If the statement is signed
on behalf of a person by his authorized representative other than an executive
officer or general partner of the filing person, evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, Provided, however, That a power of attorney for this purpose
which is already on file with the Commission may be incor porated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.

ATTENTION: Intentional misstatements or omissions of fact constitute Federal
criminal violations (see 18 U.S.C. 1001). (Secs. 3(b), 13(d)(1), 13(d)(2),
13(d)(5),  13(d)(6), 13(g)(1), 13(g)(2), 13(g)(5), 23, 48 Stat. 882, 894, 901;
sec. 203(a),  49 Stat. 704; sec. 8, 49 Stat. 1379; sec. 10, 78 Stat. 88a; sec.
2, 82 Stat. 454;  secs. 1, 2, 84 Stat. 1497; secs. 3, 10, 18, 89 Stat. 97, 119,
155; secs. 202, 203,  91 Stat. 1494, 1498, 1499; (15 U.S.C. 78c(b), 78m(d)(1),
78m(d)(2), 78m(d)(5),  78m(d)(6), 78m(g)(1), 78m(g)(2), 78m(g)(5), 78w)) [43 FR
18499, Apr. 28, 1978,  as amended at 43 FR 55756, Nov. 29, 1978; 44 FR 2148,
Jan. 9, 1979; 44 FR 11751,  Mar. 2, 1979; 61 FR 49959, Sept. 24, 1996; 62 FR
35340, July 1, 1997; 63 FR 2867,  Jan. 16, 1998; 63 FR 15287, Mar. 31, 1998]

Page 7 of 7 Pages