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


                                  SCHEDULE 13G


                    Under the Securities Exchange Act of 1934

                               (Amendment No. 1 )*
                               ------------------

                               Pico Holdings, Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)

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


                                    693366205
                  ---------------------------------------------
                                 (CUSIP Number)

                                 April 30, 2001
                       ------------------ ---------------
             (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).



                                       13G
CUSIP No. 693366205
          ---------

--------------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON /
        I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

            Artisan Partners Limited Partnership  39-1807188

--------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
        (see Instructions)
                                                                     (a) [  ]
        Not Applicable
                                                                     (b) [  ]
--------------------------------------------------------------------------------
  3     SEC USE ONLY

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

            Delaware

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

                                None
     NUMBER OF
      SHARES          ----------------------------------------------------------
   BENEFICIALLY        6    SHARED VOTING POWER
     OWNED BY
       EACH                     1,385,700
    REPORTING
      PERSON          ----------------------------------------------------------
       WITH            7    SOLE DISPOSITIVE POWER

                                None

                      ----------------------------------------------------------
                       8    SHARED DISPOSITIVE POWER

                                1,385,700

--------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            1,385,700

--------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
       (see Instructions)

           Not Applicable

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

           11.18%

--------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON
       (see Instructions)

           IA

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



                                       13G
CUSIP No. 693366205
          ---------

--------------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

            Artisan Investment Corporation

--------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
        (see Instructions)
                                                                     (a) [  ]
        Not Applicable
                                                                     (b) [  ]
--------------------------------------------------------------------------------
  3     SEC USE ONLY

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

            Wisconsin

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

                                None
      NUMBER OF
       SHARES         ----------------------------------------------------------
   BENEFICIALLY        6    SHARED VOTING POWER
     OWNED BY
       EACH                     1,385,700
    REPORTING
      PERSON         -----------------------------------------------------------
       WITH            7    SOLE DISPOSITIVE POWER

                                None

                     -----------------------------------------------------------
                       8    SHARED DISPOSITIVE POWER

                                1,385,700

--------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            1,385,700

 -------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
       (see Instructions)

           Not Applicable

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

           11.18%

--------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON
       (see Instructions)

           CO
--------------------------------------------------------------------------------



                                       13G
CUSIP No. 693366205
          ---------

--------------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

            Andrew A. Ziegler

--------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
        (see Instructions)
                                                                     (a) [  ]
        Not Applicable
                                                                     (b) [  ]
--------------------------------------------------------------------------------
  3     SEC USE ONLY

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

            U.S.A.

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

                                None
      NUMBER OF
       SHARES        -----------------------------------------------------------
    BENEFICIALLY       6    SHARED VOTING POWER
      OWNED BY
        EACH                    1,385,700
     REPORTING
       PERSON        -----------------------------------------------------------
        WITH           7    SOLE DISPOSITIVE POWER

                                None

                     -----------------------------------------------------------
                       8    SHARED DISPOSITIVE POWER

                                1,385,700

--------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            1,385,700

--------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
       (see Instructions)

           Not Applicable

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

           11.18%

--------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON
       (see Instructions)

           IN

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



                                       13G
CUSIP No. 693366205
          ---------

--------------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

            Carlene Murphy Ziegler

--------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
        (see Instructions)
                                                                     (a) [  ]
        Not Applicable
                                                                     (b) [  ]
--------------------------------------------------------------------------------
  3     SEC USE ONLY

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

            U.S.A.

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

                                None
     NUMBER OF
      SHARES         -----------------------------------------------------------
   BENEFICIALLY        6    SHARED VOTING POWER
     OWNED BY
       EACH                     1,385,700
    REPORTING
     PERSON          -----------------------------------------------------------
      WITH             7    SOLE DISPOSITIVE POWER

                                None

                     -----------------------------------------------------------
                       8    SHARED DISPOSITIVE POWER

                                1,385,700

--------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            1,385,700

--------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
       (see Instructions)

           Not Applicable

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

           11.18%

--------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON
       (see Instructions)

           IN
--------------------------------------------------------------------------------



Item 1(a)                  Name of Issuer:

                                    Pico Holdings, Inc.

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

                                    875 Prospect Street
                                    Suite 301
                                    La Jolla, California  92037

Item 2(a)                  Name of Person Filing:

                                    Artisan Partners Limited Partnership
                                            ("Artisan Partners")
                                    Artisan Investment Corporation, the general
                                            partner of Artisan Partners
                                            ("Artisan Corp.")
                                    Andrew A. Ziegler
                                    Carlene Murphy Ziegler

Item 2(b)                  Address of Principal Business Office:

                                    Artisan Partners, Artisan Corp., Mr. Ziegler
                                    and Ms. Ziegler are all located at:

                                    1000 North Water Street, #1770
                                    Milwaukee, WI 53202

Item 2(c)                  Citizenship:

                                    Artisan Partners is a Delaware limited
                                    partnership
                                    Artisan Corp. is a Wisconsin corporation
                                    Mr. Ziegler and Ms. Ziegler are
                                    U.S. citizens

Item 2(d)                  Title of Class of Securities:

                                    Common Stock

Item 2(e)                  CUSIP Number:

                                    693366205

Item 3                     Type of Person:

                                    (e) Artisan Partners is an investment
                                    adviser registered under section 203
                                    of the Investment Advisers Act of 1940;
                                    Artisan Corp. is the General Partner of
                                    Artisan Partners; Mr. Ziegler and
                                    Ms. Ziegler are the principal stockholders
                                    of Artisan Corp.



Item 4                     Ownership (at April 30, 2001):

                                    (a)     Amount owned "beneficially" within
                                            the meaning of rule 13d-3:

                                            1,385,700

                                    (b)     Percent of class:

                                            11.18 (based on 12,390,096 shares
                                            outstanding as of March 26, 2001)

                                    (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:
                                                       1,385,700
                                                (iii)  sole power to dispose or
                                                       to direct the disposition
                                                       of: None
                                                 (iv)  shared power to dispose
                                                       or to direct disposition
                                                       of: 1,385,700


Item 5                     Ownership of Five Percent or Less of a Class:

                                    Not Applicable



Item 6                     Ownership of More than Five Percent on Behalf of
                           Another Person:

                                    The shares reported herein have been
                                    acquired on behalf of discretionary clients
                                    of Artisan Partners. Persons other than
                                    Artisan Partners are entitled to receive all
                                    dividends from, and proceeds from the sale
                                    of, those shares. None of those persons, to
                                    the knowledge of Artisan Partners, Mr.
                                    Ziegler or Ms. Ziegler, has an economic
                                    interest in more than 5% of the class.


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                    Certification:

                                    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.



                                    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.

Date:  May 9, 2001


                                  ARTISAN INVESTMENT CORPORATION
                                      for itself and as general partner of
                                      ARTISAN PARTNERS LIMITED PARTNERSHIP



                                  By: /s/ Andrew A. Ziegler
                                      ------------------------------------------
                                          Andrew A. Ziegler
                                          President


                                   ANDREW A. ZIEGLER

                                   /s/ Andrew A. Ziegler
                                   ---------------------------------------------


                                   CARLENE MURPHY ZIEGLER

                                   /s/ Carlene Murphy Ziegler
                                   ---------------------------------------------



                                  Exhibit Index
                                  -------------



Exhibit 1                           Joint Filing Agreement dated as of May 9,
                                    2001 by and among Artisan Partners
                                    Limited Partnership, Artisan Investment
                                    Corporation, Andrew A. Ziegler, and
                                    Carlene Murphy Ziegler