TCW GROUP INC
SC 13G/A, 1999-02-08
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<PAGE>
                                       

                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 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 RULE 13d-2(b)
                               (Amendment No. 2 )1


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

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

                                    007094105
- -------------------------------------------------------------------------------
                                 (CUSIP Number)

                                   12/31/1998
- -------------------------------------------------------------------------------
             (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)



1    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 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>


- -------------------------------------------------------------------------------
  CUSIP No. 007094105                  13G                    Page 2 of 8 Pages
- -------------------------------------------------------------------------------


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

                         The TCW Group, Inc.
- -------------------------------------------------------------------------------
       2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                   (a)   / /
                                                                   (b)   /x/
- -------------------------------------------------------------------------------
       3. SEC USE ONLY


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

                         Nevada corporation
- -------------------------------------------------------------------------------
           NUMBER OF            5.  SOLE VOTING POWER
            SHARES                                                          -0-
         BENEFICIALLY           -----------------------------------------------
           OWNED BY             6.  SHARED VOTING POWER
             EACH                                                     1,657,827
           REPORTING            -----------------------------------------------
            PERSON              7.  SOLE DISPOSITIVE POWER
             WITH                                                           -0-
                                -----------------------------------------------
                                8.  SHARED DISPOSITIVE POWER
                                                                      1,657,827
- -------------------------------------------------------------------------------
     9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                      1,657,827
- -------------------------------------------------------------------------------
     10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                            / /
- -------------------------------------------------------------------------------
     11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
         11.4%(see response to Item 4)
- -------------------------------------------------------------------------------
     12. TYPE OF REPORTING PERSON*
                                                        HC/CO
- -------------------------------------------------------------------------------





                      *SEE INSTRUCTIONS BEFORE FILLING OUT



<PAGE>


- -------------------------------------------------------------------------------
  CUSIP No. 007094105                  13G                    Page 3 of 8 Pages
- -------------------------------------------------------------------------------


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

                          Robert Day
- -------------------------------------------------------------------------------
       2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                   (a)   / /
                                                                   (b)   /x/
- -------------------------------------------------------------------------------
       3. SEC USE ONLY

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

                          United States Citizen
- -------------------------------------------------------------------------------
           NUMBER OF            5.  SOLE VOTING POWER
            SHARES                                                          -0-
         BENEFICIALLY           -----------------------------------------------
           OWNED BY             6.  SHARED VOTING POWER
             EACH                                                     2,077,658
           REPORTING            -----------------------------------------------
            PERSON              7.  SOLE DISPOSITIVE POWER
             WITH                                                           -0-
                                -----------------------------------------------
                                8.  SHARED DISPOSITIVE POWER
                                                                      2,077,658
- -------------------------------------------------------------------------------
     9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                      2,077,658
- -------------------------------------------------------------------------------
     10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                            / /
- -------------------------------------------------------------------------------
     11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
         14.3%(see response to Item 4)
- -------------------------------------------------------------------------------
     12. TYPE OF REPORTING PERSON*
                                                 HC/IN
- -------------------------------------------------------------------------------





                      *SEE INSTRUCTIONS BEFORE FILLING OUT


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                                                            Page 4 of 8 Pages

Item 1(a).         Name of Issuer:

                   Administaff, Inc.

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

                   19001 Crescent Springs Drive
                   Kingwood, TX 77339

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

                   The TCW Group, Inc.
                   865 South Figueroa Street
                   Los Angeles, CA 90017
                   (Nevada Corporation)

                   Robert Day
                   200 Park Avenue, Suite 2200
                   New York, New York 10166
                   (United States Citizen)

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

                   Common Stock

Item 2(e).         CUSIP Number:

                   007094105



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                                                            Page 5 of 8 Pages
<TABLE>
<CAPTION>

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:
             <S>        <C>     <C>
             (a)        / /     Broker or dealer registered under Section 15 of the Exchange Act.

             (b)        / /     Bank as defined in Section 3(a)(6) of the Exchange Act.

             (c)        / /     Insurance company as defined in Section 3(a)(19) of the Exchange Act.

             (d)        / /     Investment company registered under Section 8 of the Investment Company Act.

             (e)        / /     An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E).

             (f)        / /     An employee benefit plan or endowment fund in accordance with13d-1(b)(1)(ii)(F).

             (g)        /x/     A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G).

                                       (SEE Item 7)
                                       The TCW Group, Inc.
                                       Robert Day (individual who may be deemed to control The TCW Group, Inc.
                                            and other entities which hold the Common Stock of the issuer)

             (h)        / /     A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act.

             (i)        / /     A church plan that is excluded from the definition of an investment company under 
                                Section 3(c)(14) of the Investment Company Act.

             (j)        / /     Group, in accordance with Rule 13d-1(b)(1)(ii)(J). If this statement is filed pursuant 
                                to Rule 13d-1(c), check this box. / /

</TABLE>

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                                                            Page 6 of 8 Pages
<TABLE>
<CAPTION>

Item 4.      Ownership **
             <S>       <C>
             THE TCW GROUP, INC.
             (a)       Amount beneficially owned: 1,657,827

             (b)       Percent of class: 11.4%

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

                       (i)   Sole power to vote or to direct the vote: none.

                       (ii)  Shared power to vote or to direct the vote: 1,657,827

                       (iii) Sole power to dispose or to direct the disposition of: none.

                       (iv)  Shared power to dispose or to direct the disposition of: 1,657,827

             ROBERT DAY ***
             (a)       Amount beneficially owned: 2,077,658

             (b)       Percent of class: 14.3%

             (c)       Number of shares as to which such person has:
                       (i)   Sole power to vote or to direct the vote: none.

                       (ii)  Shared power to vote or to direct the vote: 2,077,658

                       (iii) Sole power to dispose or direct the disposition of: none.

                       (iv)  Shared power to dispose or to direct the disposition of: 2,077,658
</TABLE>

- --------
**       The filing of this Schedule 13G shall not be construed as an admission
         that the reporting person or any of its affiliates is, for the purposes
         of Section 13(d) or 13(g) of the Securities Exchange Act of 1934, the
         beneficial owner of any securities covered by this Schedule 13G. In
         addition, the filing of this Schedule 13G shall not be construed as an
         admission that the reporting person or any of its affiliates is the
         beneficial owner of any securities covered by this Schedule 13G for any
         other purposes than Section 13(d) of the Securities Exchange Act of
         1934.

***      Shares reported for Robert Day include shares reported for The TCW
         Group, Inc.


<PAGE>

                                                            Page 7 of 8 Pages

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.

           Various persons other than as described in Item 4 have the right to
           receive or the power to direct the receipt of dividends from, or
           the proceeds from the sale of, the Common Stock of Administaff,
           Inc.

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

           SEE Exhibit A.

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

           Not applicable.  SEE Exhibits A and B.

Item 9.    Notice of Dissolution of Group.

           Not applicable.

Item 10.   Certification.

           Because this statement is filed pursuant to Rule 13d-1(b), the 
           following certification is included:

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


<PAGE>

                                                            Page 8 of 8 Pages


                                    SIGNATURE


             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.


Dated this 8th day of February, 1999.


                                                   The TCW Group, Inc.

                                                   By: /s/ Mohan V. Phansalkar
                                                       ------------------------
                                                       Mohan V. Phansalkar
                                                       Authorized Signatory







                                                   Robert Day

                                                   By: /s/ Mohan V. Phansalkar
                                                       ------------------------
                                                       Mohan V. Phansalkar
                                                       Under Power of Attorney 
                                                       dated January 30, 1996, 
                                                       on File with Schedule 13G
                                                       Amendment Number 1 for 
                                                       Matrix Service Co. dated 
                                                       January 30, 1996.



<PAGE>

                                       
                                    EXHIBIT A

                 RELEVANT SUBSIDIARIES OF PARENT HOLDING COMPANY

PART A: TCW ENTITIES

PARENT HOLDING COMPANY:

             The TCW Group, Inc.

             Robert Day (an individual who may be deemed to control The TCW 
Group, Inc.)

RELEVANT SUBSIDIARIES THAT ARE PERSONS DESCRIBED IN RULE 13d-1(b):

           (i)     Trust Company of the West, a California corporation and a 
                   bank as defined in Section 3(a)(6) of the Securities 
                   Exchange Act of 1934.

           (ii)    TCW Asset Management Company, a California corporation and an
                   Investment Adviser registered under Section 203 of the
                   Investment Advisers Act of 1940.

           iii)    TCW Funds Management, Inc., a California corporation and an
                   Investment Adviser registered under Section 203 of the
                   Investment Advisers Act of 1940.

Note:      No Common Stock of Administaff, Inc. is held directly by The TCW 
           Group, Inc. Other than the indirect holdings of The TCW Group, Inc., 
           and the indirect holdings of Oakmont Corporation, no Common Stock of 
           Administaff, Inc. is held directly or indirectly by Robert Day, an 
           individual who may be deemed to control The TCW Group, Inc.

PART B:    NON TCW ENTITIES

PARENT HOLDING COMPANY:

           Robert Day (an individual who may be deemed to control the entities
           described below which are not subsidiaries of The TCW Group, Inc.)

RELEVANT SUBSIDIARIES THAT ARE PERSONS DESCRIBED IN RULE 13d-1(b):

           Oakmont Corporation, a California corporation and an Investment
           Adviser registered under Section 203 of the Investment Advisers Act
           of 1940.


<PAGE>

                                       

                                    EXHIBIT B

                             JOINT FILING AGREEMENT


             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 other, except to the extent that 
he or it knows or has reason to believe that such information is accurate.

Dated this 8th day of February, 1999.

                                                   The TCW Group, Inc.

                                                   By: /s/ Mohan V. Phansalkar
                                                         -----------------------
                                                       Mohan V. Phansalkar
                                                       Authorized Signatory







                                                   Robert Day

                                                   By: /s/ Mohan V. Phansalkar
                                                       -------------------------
                                                       Mohan V. Phansalkar
                                                       Under Power of Attorney 
                                                       dated January 30, 1996, 
                                                       on File with Schedule 13G
                                                       Amendment Number 1 for 
                                                       Matrix Service Co. dated 
                                                       January 30, 1996.




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