SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G
                                 (Rule 13d-102)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
           TO RULE 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED
                            PURSUANT TO RULE 13d-2(b)
                               (Amendment No. 4)*

                              EXPRESS SCRIPTS, INC.
                                (Name of Issuer)

                     COMMON STOCK, PAR VALUE $.01 PER SHARE
                         (Title of Class of Securities)

                                   302182-10-0
                                 (CUSIP Number)

                                       N/A
             (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)
      [ ] Rule 13d-1(c)
      [x] 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 (the "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).

                                  SCHEDULE 13G

CUSIP NO. 302182-10-0                                          PAGE 2 OF 8 PAGES


--------------------------------------------------------------------------------
1.    NAME OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      NEW YORK LIFE INSURANCE COMPANY
--------------------------------------------------------------------------------
2.    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                   (a) [ ]
      (SEE INSTRUCTIONS)                                                 (b) [ ]

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

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

      New York
--------------------------------------------------------------------------------
                      5.     SOLE VOTING POWER
     NUMBER OF               0
      SHARES          ----------------------------------------------------------
   BENEFICIALLY       6.     SHARED VOTING POWER
     OWNED BY                16,240,000
       EACH           ----------------------------------------------------------
     REPORTING        7.     SOLE DISPOSITIVE POWER
      PERSON                 16,240,000
       WITH           ----------------------------------------------------------
                      8.     SHARED DISPOSITIVE POWER
                             0
--------------------------------------------------------------------------------
9.    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      16,240,000
--------------------------------------------------------------------------------
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)

      20.8%
--------------------------------------------------------------------------------
12.   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

      IC
--------------------------------------------------------------------------------

                                  SCHEDULE 13G

CUSIP NO. 302182-10-0                                          PAGE 3 OF 8 PAGES


--------------------------------------------------------------------------------
1.    NAME OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      NYLIFE LLC
--------------------------------------------------------------------------------
2.    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                   (a) [ ]
      (SEE INSTRUCTIONS)                                                 (b) [ ]

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

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

      Delaware
--------------------------------------------------------------------------------
                      5.     SOLE VOTING POWER
     NUMBER OF               0
      SHARES          ----------------------------------------------------------
   BENEFICIALLY       6.     SHARED VOTING POWER
     OWNED BY                4,500,000
       EACH           ----------------------------------------------------------
     REPORTING        7.     SOLE DISPOSITIVE POWER
      PERSON                 4,500,000
       WITH           ----------------------------------------------------------
                      8.     SHARED DISPOSITIVE POWER
                             0
--------------------------------------------------------------------------------
9.    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      4,500,000
--------------------------------------------------------------------------------
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)

      5.8%
--------------------------------------------------------------------------------
12.   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

      OO
--------------------------------------------------------------------------------

ITEM 1(a).     NAME OF ISSUER:

               Express Scripts, Inc.

ITEM 1(b).     ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

               13900 Riverport Drive
               Maryland Heights, MO  63043

ITEM 2(a).     NAME OF PERSONS FILING:

               New York Life Insurance Company ("New York Life") and its wholly
               owned subsidiary, NYLIFE LLC, the successor entity to NYLIFE Inc.
               ("NYLIFE"). Filing Persons under Schedule 13G (filed on February
               17, 1998), as amended by Amendment No. 1 to Schedule 13G (filed
               on February 9, 1999), Amendment No. 2 to Schedule 13G (filed on
               February 9, 2001) and Amendment No. 3 to Schedule 13G (filed on
               February 14, 2002).

ITEM 2(b).     ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:

               The principal business office for each of New York Life and
               NYLIFE is 51 Madison Avenue, New York, NY 10010.

ITEM 2(c).     CITIZENSHIP:

               New York Life is a New York mutual insurance company and NYLIFE
               is a Delaware limited liability company.

ITEM 2(d).     TITLE OF CLASS OF SECURITIES:

               Common Stock, par value $.01 per share, of the Issuer ("Common
               Stock").

ITEM 2(e).     CUSIP NUMBER:

               302182-10-0

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
                         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;


                                Page 4 of 8 Pages

               d.  [  ]  Investment company registered under Section 8 of the
                         Investment Company Act;

               e.  [  ]  An investment advisor in accordance with Rule
                         13d-1(b)(1)(ii)(E);

               f.  [  ]  An employee benefit plan or endowment fund in
                         accordance with Rule 13d-1(b)(1)(ii)(F);

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

               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).

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.

               New York Life Insurance Company

               a.     Amount beneficially owned:  16,240,000*

               b.     Percent of class:  20.8% based on 77,904,824 shares
                      outstanding as reported in the Quarterly Report on Form
                      10-Q filed by the Issuer on November 15, 2002.

               c.     Number of shares as to which such person has:

                      i.    Sole power to vote or to direct the vote:  0

                      ii.   Shared power to vote or to direct the vote:
                            16,240,000

                      iii.  Sole power to dispose or to direct the disposition
                            of:  16,240,000

                      iv.   Shared power to dispose or to direct the disposition
                            of:  0

               NYLIFE LLC

               a.     Amount beneficially owned: 4,500,000


                                Page 5 of 8 Pages

               b.     Percent of class: 5.8% based on 77,904,824 shares
                      outstanding as reported in the Quarterly Report on Form
                      10-Q filed by the Issuer on November 15, 2002.

               c.     Number of shares as to which such person has:

                      i.    Sole power to vote or to direct the vote:  0

                      ii.   Shared power to vote or to direct the vote:
                            4,500,000

                      iii.  Sole power to dispose or to direct the disposition
                            of: 4,500,000

                      iv.   Shared power to dispose or to direct the disposition
                            of:  0

            *Does not include an aggregate of 3,699 shares managed for unrelated
customers by investment management subsidiaries of New York Life. NYLIFE is the
beneficial owner of 4,500,000 shares (the "NYLIFE Shares") of Common Stock,
which represents approximately 5.8% of the outstanding shares of Common Stock
based on 77,904,824 shares outstanding as reported in the Quarterly Report on
Form 10-Q filed by the Issuer on November 15, 2002. New York Life owns the
entire limited liability company interest of NYLIFE and, as a result, may be
deemed to be the beneficial owner of the NYLIFE Shares.

            As previously reported, on November 7, 2000, in connection with an
offering of certain securities issued by the Express Scripts Automatic Exchange
Security Trust, a trust not affiliated with either Reporting Person or Express
Scripts, Inc. (the "Trust"), NYLIFE entered into a forward purchase agreement
(the "Contract") with the Trust relating to the disposition by NYLIFE of up to
6,900,000 shares of Common Stock held by NYLIFE (the "Contract Shares"). On
February 11, 2002 NYLIFE effected a distribution to New York Life which includes
the Contract Shares and New York Life assumed NYLIFE's obligations under the
Contract.

            As previously reported, on August 22, 2001 NYLIFE entered into a
SAILS Mandatorily Exchangeable Securities Contract with Credit Suisse First
Boston International relating to the disposition by NYLIFE of up to 4,500,000
shares of Common Stock held by NYLIFE.

            Under a Stockholder and Registration Rights Agreement between the
Issuer and New York Life, New York Life has agreed, and agreed to cause each of
its subsidiaries, including NYLIFE, to vote (A) the 6,900,000 shares of Common
Stock pledged to the Trust in the same proportion and to the same effect as the
votes cast by the other stockholders of the Issuer at any meeting of
stockholders (or in any written consent) of the Issuer and (B) all voting
securities of the Issuer held by New York Life and its subsidiaries (including
the 16,240,000 shares of Common Stock, but excluding shares managed for
unrelated customers by New York Life or its investment management subsidiaries),
in favor of the Issuer's slate of nominees for directors recommended by the
Issuer's Board of Directors for election by stockholders of the Issuer (provided
that, so long as New York Life is entitled to representation on the Issuer's
Board of Directors pursuant to the Stockholder and Registration Rights
Agreement, such slate includes New York Life's nominees).


                                Page 6 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 [ ].

               Not applicable.

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 THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING
               COMPANY OR CONTROL PERSON.

               Not applicable.

ITEM 8.        IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

               Not applicable.

ITEM 9.        NOTICE OF DISSOLUTION OF GROUP.

               Not applicable.

ITEM 10.       CERTIFICATIONS.

               Not applicable.

Joint Filing Agreement, incorporated by reference to Amendment No. 3 to the
Schedule 13G of the registrant filed on February 13, 2002.


                                Page 7 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: February 14, 2003


                                         NEW YORK LIFE INSURANCE COMPANY


                                         By:   /s/ Anne F. Pollack
                                               ---------------------------------
                                               Name:  Anne F. Pollack
                                               Title: Senior Vice President and
                                                      Chief Investment Officer

                                         NYLIFE LLC


                                         By:   /s/ Anne F. Pollack
                                               ---------------------------------
                                               Name:  Anne F. Pollack
                                               Title: Senior Vice President and
                                                      Chief Investment Officer


                                Page 8 of 8 Pages