LABONE INC
SC 13G/A, 2000-04-10
MEDICAL LABORATORIES
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                       SECURITIES AND EXCHANGE COMMISSION
                              Washington D.C. 20549


                             Washington, D.C. 20549
                                  SCHEDULE 13G
                    Under the Securities Exchange Act of 1934

                             (Amendment Number One)



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

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

                                    50540L105
- -------------------------------------------------------------------------------
                                 (Cusip Number)

                                    3/31/2000
- -------------------------------------------------------------------------------
             (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 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).



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CUSIP NO. 50540L105                                                         13G


1)  NAME OF REPORTING PERSON        I.R.S. NUMBER OF REPORTING PERSON
      Wallace R. Weitz & Company    Tax I.D. No. 47-0654095

2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
            (a) [   ]
            (b) [ X ]

3)  SEC USE ONLY

4)  CITIZENSHIP OR PLACE OF ORGANIZATION
         State of Nebraska

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:
5)  SOLE VOTING POWER:              829,550

6)  SHARED VOTING POWER:            None

7)  SOLE DISPOSITIVE POWER:         829,550

8)  SHARED DISPOSITIVE POWER:       None

9)  AGGREGATE AMOUNT OWNED BY EACH REPORTING PERSON
         829,550

10) CHECK IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES
                  [  ]

11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.
         7.2%

12) TYPE OF REPORTING PERSON
         IA

                                       2

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CUSIP NO. 50540L105                                                    13G

1) NAME OF REPORTING PERSON        I.R.S. NUMBER OF REPORTING PERSON
     Wallace R. Weitz              Tax  I.D. No. ###-##-####

2) CHECK THE APPROPRIATE BOX IF A MAMBER OF A GROUP:
          (a)   [    ]
          (b)   [  X ]

2) SEC USE ONLY

3) CITIZENSHIP OR PLACE OF ORGANIZATION
     Citizen of the United States of America

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:
5) SOLE VOTING POWER:           NONE

6) SHARED VOTING POWER:            829,550

7) SOLE DISPOSITIVE POWER:         NONE

8) SHARED DISPOSITIVE POWER:       829,550

9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      7.2%

10)CHECK IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES
                      [   ]

11)PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
      7.2%

12)TYPE OF REPORTING PERSON
      IN


                                       3


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Item 1(a).  Name of Issuer:
               LabOne, Inc.

Item 1(b).  Address of Issuer's Principal Executive Office:
               10101 Renner Blvd.
               Lenexa, Kansas 66219

Item 2(a).  Names of Persons Filing:
               Wallace R. Weitz & Company
               Wallace R. Weitz, President and Sole Owner of Wallace R.
                 Weitz & Company

Item 2(b).  Principal Business Address of Persons Filing:
               1125 South 103rd Street, Suite 600
               Omaha, Nebraska 68124-6008

Item 2(c).  Citizenship:
               Wallace R. Weitz & Company - State of Nebraska
               Wallace R. Weitz - Citizen of United States of America

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

Item 2(e).  CUSIP Number:
                  50540L105

Item 3. If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b),
check whether the person filing is a:

     (e)  Investment Adviser registered under Section 203 of the Investment
          Advisers Act of 1940. This statement is being filed by Wallace R.
          Weitz & Company ("Weitz & Co.") as a registered investment adviser.
          All of the securities reported in this statement are owned of record
          by investment advisory clients of Weitz & Co. and none are owned
          directly or indirectly by Weitz & Co. As permitted by Rule 13d-4, the
          filing of this statement shall not be construed as an admission that
          Weitz & Co. is the beneficial owner of any of the securities covered
          by the statement.

     (f)  Parent Holding Company. This statement is also being filed by Wallace
          R. Weitz, President and sole owner of Weitz & Co. in the event he
          could be deemed to be an indirect beneficial owner of the securities
          reported by Weitz & Co. through the exercise of voting control and/or
          dispositive power over the securities as a result of his official
          positions or ownership of the voting securities of Weitz & Co. Mr.
          Weitz does not own directly or indirectly any securities covered by
          this statement for his own account. As permitted by Rule 13d-4, the
          filing of this statement shall not be construed as an admission that
          Mr. Weitz is the beneficial owner of any of the securities covered by
          this statement.


                                       4

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Item 4.  Ownership:
                  (a)  Amount Beneficially Owned: 829,550 shares
                  (b)  Percent of Class:  7.2%
                  (c)  Number of Shares as to which such person has:
                        (i) sole power to direct vote:          829,550
                                 Weitz & Co.
                        (ii) shared power to direct vote:       829,500
                                 Weitz & Co. and Wallace R. Weitz
                        (iii) sole power to dispose:            829,550
                                 Weitz & Co.
                         (iv) shared power to dispose:          829,550
                                 Weitz & Co. and Wallace R. Weitz

 Item 6.  Ownership of More Than Five Percent on Behalf of Another Person
                  Weitz Series Fund, Inc.-Value Fund is the record owner of
                  644,350 shares of the Issuer, representing 5.5% of the
                  Issuer's shares. Weitz & Co. has the sole power to vote or
                  direct the vote of the securities covered by this statement.

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 for the purpose of and do not
         have the effect of changing or influencing the control of the issuer of
         such securities and were not acquired in connection with or as a
         participant in any transaction having such purposes or effect.


         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 :  April 10, 2000

         WALLACE R. WEITZ & COMPANY

         By:      /s/ Mary K. Beerling
         Name:    Mary K. Beerling
         Title:   Vice President/General Counsel

         WALLACE R. WEITZ
         (Individually)

         /s/ Wallace R. Weitz

                                       5


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                             Joint Filing Agreement

In accordance with Rule 13d-1 (k) under the Securities Exchange Act of 1934, the
persons or entities named below agree to the joint filing on behalf of each of
them of this Schedule 13G with respect to the securities of the Issuer and
further agree that this joint filing agreement be included as an exhibit to this
Schedule 13G. In evidence thereof, the undersigned hereby execute this agreement
as of the 10th day of April, 2000.

          WALLACE R. WEITZ & COMPANY

         By:      /s/ Mary K. Beerling
         Name:    Mary K. Beerling
         Title:   Vice President/General Counsel

         WALLACE R. WEITZ
         (Individually)

         /s/ WALLACE R. WEITZ

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