BOSTON PARTNERS ASSET MANAGEMENT L P
SC 13G/A, 2000-03-09
INVESTMENT ADVICE
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<PAGE>   1
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549



                                  SCHEDULE 13G



                   UNDER THE SECURITIES EXCHANGE ACT OF 1934

                              (AMENDMENT NO. 1 )*


                                BlackRock, Inc.
- -------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $.01 par value
- -------------------------------------------------------------------------------

                         (Title of Class of Securities)

                                   09247X101
- -------------------------------------------------------------------------------
                                 (CUSIP Number)

            February 29, 2000 - Amendment pursuant to Rule 13d-2(c)
- -------------------------------------------------------------------------------
            (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 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 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>   2



CUSIP NO.  09247X101



<TABLE>
- -------------------------------------------------------------------------------------------------------------
<S>       <C>
     1.          NAMES OF REPORTING PERSONS.
                 I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

                 Boston Partners Asset Management, L.P.

- -------------------------------------------------------------------------------------------------------------
     2.          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                                        (a) [ ]
                                                                        (b) [ ]
                 Not applicable

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


- -------------------------------------------------------------------------------------------------------------
     4.          CITIZENSHIP OR PLACE OF ORGANIZATION

                 Delaware

- -------------------------------------------------------------------------------------------------------------
                                             5.         SOLE VOTING POWER
             NUMBER OF
               SHARES                                   -0- shares
            BENEFICIALLY
              OWNED BY                -----------------------------------------------------------------------
                EACH                         6.         SHARED VOTING POWER
             REPORTING
               PERSON                                   907,100 shares
               WITH:                  -----------------------------------------------------------------------
                                             7.         SOLE DISPOSITIVE POWER

                                                        -0- shares
                                      -----------------------------------------------------------------------
                                             8.         SHARED DISPOSITIVE POWER

                                                        907,100 shares
- -------------------------------------------------------------------------------------------------------------
     9.          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


                 907,100 shares

- -------------------------------------------------------------------------------------------------------------
     10.         CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE
                 INSTRUCTIONS)

                 Not applicable

- -------------------------------------------------------------------------------------------------------------
     11.         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

                 10.1 %

- -------------------------------------------------------------------------------------------------------------
     12.         TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                 IA
- -------------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>   3




CUSIP NO.  09247X101
<TABLE>

- -------------------------------------------------------------------------------------------------------------
<S>         <C>
     1.          NAMES OF REPORTING PERSONS.
                 I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

                 Boston Partners, Inc.

- -------------------------------------------------------------------------------------------------------------
     2.          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                                        (a)  [ ]
                                                                        (b)  [ ]
                 Not applicable

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


- -------------------------------------------------------------------------------------------------------------
     4.          CITIZENSHIP OR PLACE OF ORGANIZATION

                 Delaware

- -------------------------------------------------------------------------------------------------------------
                                               5.       SOLE VOTING POWER
               NUMBER OF
                SHARES
             BENEFICIALLY                               -0- shares
               OWNED BY
                 EACH                    --------------------------------------------------------------------
               REPORTING                       6.       SHARED VOTING POWER
                PERSON
                 WITH:
                                                        907,100 shares
                                         --------------------------------------------------------------------
                                               7.       SOLE DISPOSITIVE POWER


                                                        -0- shares
                                         --------------------------------------------------------------------
                                               8.       SHARED DISPOSITIVE POWER


                                                        907,100 shares
- -------------------------------------------------------------------------------------------------------------
     9.          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


                 907,100 shares

- -------------------------------------------------------------------------------------------------------------
     10.         CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE
                 INSTRUCTIONS)

                 Not applicable

- -------------------------------------------------------------------------------------------------------------
     11.         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

                 10.1 %

- -------------------------------------------------------------------------------------------------------------
     12.         TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                 CO
- -------------------------------------------------------------------------------------------------------------
</TABLE>





<PAGE>   4


CUSIP NO.  09247X101

<TABLE>
- ---------------------------------------------------------------------------------------------------------
<S>         <C>
     1.          NAMES OF REPORTING PERSONS.
                 I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

                 Desmond John Heathwood

- ---------------------------------------------------------------------------------------------------------
     2.          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                                      (a) [ ]
                                                                      (b) [ ]
                 Not applicable

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


- ---------------------------------------------------------------------------------------------------------
     4.          CITIZENSHIP OR PLACE OF ORGANIZATION

                 United States

- ---------------------------------------------------------------------------------------------------------
                                             5.         SOLE VOTING POWER

             NUMBER OF
               SHARES                                   -0- shares
            BENEFICIALLY
              OWNED BY                -------------------------------------------------------------------
                EACH                         6.         SHARED VOTING POWER
             REPORTING
               PERSON                                   907,100 shares
               WITH:                  -------------------------------------------------------------------
                                             7.         SOLE DISPOSITIVE POWER

                                                        -0- shares
                                      -------------------------------------------------------------------
                                             8.         SHARED DISPOSITIVE POWER

                                                        907,100 shares
- ----------------------------------------------------------------------------------------------------------
     9.          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                 907,100 shares

- ---------------------------------------------------------------------------------------------------------
     10.         CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
                 (SEE INSTRUCTIONS)


                 Not applicable

- ---------------------------------------------------------------------------------------------------------
     11.         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

                 10.1 %

- ---------------------------------------------------------------------------------------------------------
     12.         TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                 IN
- ---------------------------------------------------------------------------------------------------------
</TABLE>



<PAGE>   5

<TABLE>
<S>               <C>
ITEM 1.           (a)      Name of Issuer:
                           ---------------
                           BlackRock, Inc. (the "Issuer")

                  (b)      Address of Issuer's Principal Executive Offices:
                           ------------------------------------------------
                           345 Park Avenue, New York, New York, 10154

ITEM 2.           (a)      Names of Persons Filing:
                           ------------------------
                           Boston Partners Asset Management, L.P. ("BPAM"), Boston Partners, Inc. ("Boston
                           Partners"), and Desmond John Heathwood.  BPAM, Boston Partners, and Mr. Heathwood are
                           sometimes referred to collectively herewith as the "Reporting Persons."

                  (b)      Address of Principal Business Office or, if None, Residence:
                           ------------------------------------------------------------
                           The address of the principal business office of BPAM, Boston Partners, and Mr.
                           Heathwood is 28 State Street, 20th Floor, Boston, MA 02109.

                  (c)      Citizenship:
                           ------------
                           BPAM is a Delaware limited partnership.  Boston Partners is a Delaware corporation.
                           Mr. Heathwood is a United States citizen.

                  (d)      Title of Class of Securities:
                           -----------------------------
                           Common Stock, $.01 par value ("Common Stock").

                  (e)      CUSIP Number:  09247X101
                           ------------

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)      [ ]      Group, in accordance with Section 240.13d-1(b)(1)(ii)(J).

ITEM 4.           Ownership.
                  ----------
</TABLE>



<PAGE>   6



<TABLE>
<S>               <C>
                  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:  Each of the Reporting Persons may be deemed to own
                           beneficially 907,100 shares of Common Stock at February 29, 2000.  BPAM owns of record
                           907,100 shares of Common Stock.  As sole general partner of BPAM, Boston Partners may
                           be deemed to own beneficially all of the shares of Common Stock that BPAM may be
                           deemed to own beneficially.  As principal stockholder of Boston Partners, Mr.
                           Heathwood may be deemed to own beneficially all of the Common Stock that Boston
                           Partners may be deemed to own beneficially.  Therefore, each of the Reporting Persons
                           may be deemed to own beneficially 907,100 shares of Common Stock of the Issuer.

                  (b)      Percentage of class:  10.1 % for all Reporting Persons.

                  (c)      Number of shares as to which the person has:

                           (i)  Sole power to vote or to direct the vote:  0 shares for all Reporting
                                Persons.

                           (ii) Shared power to vote or to direct the vote: 907,100 for all Reporting
                                Persons.

                           (ii) Sole power to dispose or to direct the disposition of:  0 shares for all
                                Reporting Persons.

                           (iv) Shared power to dispose or to direct the disposition of: 907,100 shares for
                                all Reporting Persons.

                  Instruction.  For computations regarding securities which represent a right to acquire an
                  underlying security see Section 240.13d-3(d)(1).

                  Pursuant to Rule 13d-4, each of Boston Partners and Mr. Heathwood expressly disclaims
                  beneficial ownership of any shares of Common Stock of the Issuer.

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 [ ].

                  Instruction:  Dissolution of a group requires a response to this item.

ITEM 6.           Ownership of More than Five Percent on Behalf of Another Person.
                  ----------------------------------------------------------------

                  If any other person is known to have the right to receive or the power to direct the
                  receipt of dividends from, or the proceeds from the sale of, such securities, a
                  statement to that effect should be included in response to this item and, if such
                  interest relates to more than five percent of the class, such person should be
                  identified. A listing of the
</TABLE>

<PAGE>   7



<TABLE>
<S>               <C>
                  shareholders of an investment company registered under the Investment Company Act of
                  1940 or the beneficiaries of an employee benefit plan, pension fund or endowment fund
                  is not required.

                  BPAM holds all of the above 907,100 shares under management for its clients, who have
                  the right to direct the receipt of dividends, to receive dividends from such shares
                  and to receive the proceeds from the sale of such shares. None of these clients holds
                  more than five percent of the Common Stock of the Issuer.

ITEM 7.           Identification and Classification of the Subsidiary Which Acquired the Security Being Reported
                  ----------------------------------------------------------------------------------------------
                  on By the Parent Holding Company.
                  ---------------------------------

                  If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G),
                  so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3
                  classification of the relevant subsidiary. If a parent holding company has filed this
                  schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the
                  identification of the relevant subsidiary.

                  Not applicable.

ITEM 8.           Identification and Classification of Members of the Group.
                  ----------------------------------------------------------

                  If a group has filed this schedule pursuant to Section 240.13d-1(b)(1)(ii)(J), so
                  indicate under Item 3(j) and attach an exhibit stating the identity and Item 3
                  classification of each member of the group. If a group has filed this schedule
                  pursuant to Section 240.13d-1(c) or Section 240.13d-1(d), attach an exhibit stating
                  the identity of each member of the group.

                  Not applicable.  BPAM, Boston Partners and Mr. Heathwood expressly disclaim membership
                  in a "group" as defined in Rule 13d-5(b)(1).

ITEM 9.           Notice of Dissolution of Group.
                  -------------------------------

                  Notice of dissolution of a group may be furnished as an exhibit stating the date of
                  the dissolution and that all further filings with respect to transactions in the
                  security reported on will be filed, if required, by members of the group, in their
                  individual capacity. See Item 5.

                  Not applicable.

ITEM 10.          Certification.
                  --------------

                  By signing below we certify that, to the best of our 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.
</TABLE>

<PAGE>   8





                                   SIGNATURE

         After reasonable inquiry and to the best of our knowledge and belief,
we certify that the information set forth in this statement is true, complete
and correct. We also hereby agree to file this statement jointly pursuant to
the agreement set forth as Exhibit 1 hereto.

Dated:   March 7, 2000

BOSTON PARTNERS ASSET MANAGEMENT, L.P.

By:      Boston Partners, Inc.,
         its general partner


         By:      /s/ Mary Ann Iudice
                  -------------------
                  William J. Kelly
                  Treasurer and Senior Vice President
                  by:      Mary Ann Iudice
                           Attorney-in-Fact*


BOSTON PARTNERS, INC.

         By:      /s/ Mary Ann Iudice
                  -------------------
                  William J. Kelly
                  Treasurer and Senior Vice President
                  by:      Mary Ann Iudice
                           Attorney-in-Fact*

/s/ Mary Ann Iudice
- -------------------
Desmond John Heathwood
by:      Mary Ann Iudice
         Attorney-in-Fact**

*     Signed pursuant to a Power of Attorney executed by William J. Kelly
(contained as Exhibit 24.2 to this Schedule 13G filed with the Securities and
Exchange Commission on February 11, 2000, and incorporated herein by
reference).

**    Signed pursuant to a Power of Attorney executed by Desmond John Heathwood
(contained as Exhibit 24.1 to this Schedule 13G filed with the Securities and
Exchange Commission on February 11, 2000, and incorporated herein by
reference).


<PAGE>   9


                                                                     EXHIBIT 1

                                    AGREEMENT

      Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934,
the undersigned hereby agree that only one statement containing the information
required by Schedule 13G need be filed with respect to the ownership by each of
the undersigned of shares of Common Stock of BlackRock, Inc.

      This Agreement may be executed in any number of counterparts, each of
which shall be deemed an original.

      EXECUTED this 7th day of March, 2000.



BOSTON PARTNERS ASSET MANAGEMENT, L.P.

By:      Boston Partners, Inc.
         its general partner


         By:      /s/ Mary Ann Iudice
                  -------------------
                  William J. Kelly
                  Treasurer and Senior Vice President
                  by:      Mary Ann Iudice
                           Attorney-in-Fact*


BOSTON PARTNERS, INC.

         By:      /s/ Mary Ann Iudice
                  -------------------
                  William J. Kelly
                  Treasurer and Senior Vice President
                  by:      Mary Ann Iudice
                           Attorney-in-Fact*


/s/ Mary Ann Iudice
- -------------------
Desmond John Heathwood
by:      Mary Ann Iudice
         Attorney-in-Fact**

*     Signed pursuant to a Power of Attorney executed by William J. Kelly
(contained as Exhibit 24.2 to this Schedule 13G filed with the Securities and
Exchange Commission on February 11, 2000, and incorporated herein by
reference).

**    Signed pursuant to a Power of Attorney executed by Desmond John Heathwood
(contained as Exhibit 24.1 to this Schedule 13G filed with the Securities and
Exchange Commission on February 11, 2000, and incorporated herein by
reference).





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