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

                                  SCHEDULE 13G


                    Under the Securities Exchange Act of 1934
                               (Amendments No. _)*


                               Ares Capital Corp.
--------------------------------------------------------------------------------
                                (Name of Issuer)


                                     Common
--------------------------------------------------------------------------------
                           (Title of Class Securities)


                                    04010L103
                      ------------------------------------
                                 (CUSIP Number)


                               December 31, 2004
--------------------------------------------------------------------------------
             (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)

*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
disclosure provided in a prior cover page.

The information required in 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).




Potential persons who are to respond to the collection of information  contained
in this form are not  required  to respond  unless  the form  displays a current
valid OMB control number.


SEC 1745 (3-98)


                               Page 1 of 8 pages




CUSIP No.  04010L103

    1. Name of Reporting Persons.
        I.R.S. Identification Nos. of above persons (entities only).

        Osterweis Capital Management, Inc.
        94-2871718
--------------------------------------------------------------------------------

    2. Check the Appropriate Box if a Member of a Group (See Instructions)

        (a)  ...................................................................
             -------------------------------------------------------------------

        (b)  ...................................................................
             -------------------------------------------------------------------
--------------------------------------------------------------------------------

    3.  SEC Use Only............................................................
                    ------------------------------------------------------------
--------------------------------------------------------------------------------

    4.  Citizenship or Place of Organization     California.....................
                                              ----------------------------------
--------------------------------------------------------------------------------

Number of        5.  Sole Voting Power        109,350...........................
Shares Bene-      --------------------------------------------------------------
ficially Owned -----------------------------------------------------------------
by Each        6.  Shared Voting Power        ..................................
Reporting                               ----------------------------------------
Person With:    ----------------------------------------------------------------
                7.  Sole Dispositive Power        109,350.......................
                                            ------------------------------------
                ----------------------------------------------------------------
                8.  Shared Dispositive Power        ............................
                                              ----------------------------------
--------------------------------------------------------------------------------

    9.  Aggregate Amount Beneficially Owned by Each Reporting Person   109,350..
                                                                      ----------

    10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares
        (See Instructions)     N/A..............................................
                           -----------------------------------------------------

    11. Percent of Class Represented by Amount in Row (9)     0.99%.............
                                                           ---------------------
--------------------------------------------------------------------------------

    12. Type of Reporting Person (See Instructions) IA
--------------------------------------------------------------------------------

   .............................................................................
--------------------------------------------------------------------------------

   .............................................................................
--------------------------------------------------------------------------------

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SEC 1745 (3-98)
                               Page 2 of 8 pages



CUSIP No. 04010L103

    1. Name of Reporting Persons.
        I.R.S. Identification Nos. of above persons (entities only).

        Osterweis Capital Management, LLC
        94-3268572
--------------------------------------------------------------------------------

    2. Check the Appropriate Box if a Member of a Group (See Instructions)

        (a)  ...................................................................
             -------------------------------------------------------------------

        (b)  ...................................................................
             -------------------------------------------------------------------
--------------------------------------------------------------------------------

    3.  SEC Use Only............................................................
                    ------------------------------------------------------------
--------------------------------------------------------------------------------

    4.  Citizenship or Place of Organization     California.....................
                                              ----------------------------------
--------------------------------------------------------------------------------

Number of        5.  Sole Voting Power        504,650...........................
Shares Bene-      --------------------------------------------------------------
ficially Owned -----------------------------------------------------------------
by Each        6.  Shared Voting Power        ..................................
Reporting                               ----------------------------------------
Person With:    ----------------------------------------------------------------
                7.  Sole Dispositive Power        497,650.......................
                                            ------------------------------------
                ----------------------------------------------------------------
                8.  Shared Dispositive Power        ............................
                                              ----------------------------------
--------------------------------------------------------------------------------

    9.  Aggregate Amount Beneficially Owned by Each Reporting Person   504,650..
                                                                      ----------

    10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares
        (See Instructions)     N/A..............................................
                           -----------------------------------------------------

    11. Percent of Class Represented by Amount in Row (9)     4.56%.............
                                                           ---------------------
--------------------------------------------------------------------------------

    12. Type of Reporting Person (See Instructions) IA
--------------------------------------------------------------------------------

   .............................................................................
--------------------------------------------------------------------------------

   .............................................................................
--------------------------------------------------------------------------------

   .............................................................................
--------------------------------------------------------------------------------

   .............................................................................
--------------------------------------------------------------------------------

   .............................................................................
--------------------------------------------------------------------------------

   .............................................................................
--------------------------------------------------------------------------------

   .............................................................................
--------------------------------------------------------------------------------


SEC 1745 (3-98)


                               Page 3 of 8 pages



CUSIP No. 04010L103

    1. Name of Reporting Persons.
        I.R.S. Identification Nos. of above persons (entities only).

        John S. Osterweis

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

    2. Check the Appropriate Box if a Member of a Group (See Instructions)

        (a)  ...................................................................
             -------------------------------------------------------------------

        (b)  ...................................................................
             -------------------------------------------------------------------
--------------------------------------------------------------------------------

    3.  SEC Use Only............................................................
                    ------------------------------------------------------------
--------------------------------------------------------------------------------

    4.  Citizenship or Place of Organization     California.....................
                                              ----------------------------------
--------------------------------------------------------------------------------

Number of        5.  Sole Voting Power        614,000...........................
Shares Bene-      --------------------------------------------------------------
ficially Owned -----------------------------------------------------------------
by Each        6.  Shared Voting Power        ..................................
Reporting                               ----------------------------------------
Person With:    ----------------------------------------------------------------
                7.  Sole Dispositive Power        607,000.......................
                                            ------------------------------------
                ----------------------------------------------------------------
                8.  Shared Dispositive Power        ............................
                                              ----------------------------------
--------------------------------------------------------------------------------

    9.  Aggregate Amount Beneficially Owned by Each Reporting Person   614,000..
                                                                      ----------

    10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares
        (See Instructions)     N/A..............................................
                           -----------------------------------------------------

    11. Percent of Class Represented by Amount in Row (9)     5.55%.............
                                                           ---------------------
--------------------------------------------------------------------------------

    12. Type of Reporting Person (See Instructions) IN
--------------------------------------------------------------------------------

   .............................................................................
--------------------------------------------------------------------------------

   .............................................................................
--------------------------------------------------------------------------------

   .............................................................................
--------------------------------------------------------------------------------

   .............................................................................
--------------------------------------------------------------------------------

   .............................................................................
--------------------------------------------------------------------------------

   .............................................................................
--------------------------------------------------------------------------------

   .............................................................................
--------------------------------------------------------------------------------


SEC 1745 (3-98)


                               Page 4 of 8 pages



                                                                     Page 5 of 8


Item 1.

      (a)  Name of Issuer

           Ares Capital Corp.


      (b)  Address of Issuer's Principal Executive Offices

           1999 Avenue of the Stars, Suite 1900
           Los Angeles, CA  90067

Item 2.

      (a)  Name of Person Filing

           (i) Osterweis Capital Management, Inc.

           (ii)  Osterweis Capital Management, LLC

           (iii) John S. Osterweis


      (b)  Address of Principal Business office or, if None, Residence

           (i) One Maritime Plaza, Suite 800, San Francisco CA 94111

           (ii) One Maritime Plaza, Suite 800, San Francisco CA 94111

           (iii) One Maritime Plaza, Suite 800, San Francisco CA 94111


      (c)  Citizenship

           (i) CA Corporation

           (ii) CA Limited Liability Company

           (iii) U.S. Citizen


      (d)  Title of Class Securities

           Common


      (e)  CUSIP Number

           04010L103





                                                                     Page 6 of 8


Item 3.  If this statement is filed pursuant to Sections 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)   |X| An investment adviser in accordance with Section
                   240.13d-1(b)(1)(ii)(E);
         (f)   |_| An employee benefit plan or endowment fund in accordance with
                   Section 240.13d-1(b)(1)(ii)(F);
         (g)   |_| A parent holding company or control person in accordance with
                   Section 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)   |X| Group, in accordance with Section 240.13d-1(b)(1)(ii)(J).


Item 4.  Ownership

         Common Stock:
         (a) Amount Beneficially Owned: 614,000
                                        -------
         (b) Percent of Class: 5.55%
                               -----
         (c) Number of shares as to which the joint filers have:

               (i) sole power to vote or to direct the vote: 614,000
                                                             -------
               (ii) shared power to vote or to direct the vote:
                                                               -------
               (iii) sole power to dispose or to direct the disposition of:
                     607,000
                     -------
               (iv) shared power to dispose of or to direct the disposition
                    of:
                        -------

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 securities, check the following |_|.

Item 6.    Ownership of More than Five Percent on Behalf of Another Person.  N/A





                                                                     Page 7 of 8


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

         (a) The following certification shall be included if the statement is
             filed pursuant to Section 240.13d-1(b):

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


                                    SIGNATURE
Date:  2/14/05
                                    /s/ John S. Osterweis
                                    -----------------------------------------
                                                   Signature
                                     By: John S. Osterweis, President of
                                         Osterweis Capital Management, Inc.


                                    /s/ John S. Osterweis
                                    -----------------------------------------
                                                   Signature
                                     By: John S. Osterweis, President of
                                         Osterweis Capital Management, LLC


                                    /s/ John S. Osterweis
                                    -----------------------------------------
                                                   Signature
                                    By: John S. Osterweis, Control Person of
                                        Osterweis Capital Management, Inc. and
                                        Osterweis Capital Management, LLC





                                                                     Page 8 of 8


EXHIBIT A
       ---

                  Joint Filing Agreement Pursuant to Rule 13d-1
                  ---------------------------------------------

This agreement is made pursuant to Rule 13d-1(b)(ii)(J) and Rule 13d-1(k)(1)
under the Securities and Exchange Act of 1934 (the "Act") by and among the
parties listed below, each referred to herein as a "Joint Filer." The Joint
Filers agree that a statement of beneficial ownership as required by Sections
13(g) or 13(d) of the Act and the Rules thereunder may be filed on each of their
behalf on Schedule 13G or Schedule 13D, as appropriate, and that said joint
filing may thereafter be amended by further joint filings. The Joint Filers
state that they each satisfy the requirements for making a joint filing under
Rule 13d-1.


Dated:  2/14/05


                                    /s/ John S. Osterweis
                                    -----------------------------------------
                                                   Signature
                                     By: John S. Osterweis, President of
                                         Osterweis Capital Management, Inc.


                                    /s/ John S. Osterweis
                                    -----------------------------------------
                                                   Signature
                                     By: John S. Osterweis, President of
                                         Osterweis Capital Management, LLC


                                    /s/ John S. Osterweis
                                    -----------------------------------------
                                                   Signature
                                    By: John S. Osterweis, Control Person of
                                        Osterweis Capital Management, Inc. and
                                        Osterweis Capital Management, LLC