UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1) Wabash National Corp./1/ -------------------------------- (Name of Issuer) Common Stock -------------------------------- (Title of Class of Securities) 929566107 --------------------- (CUSIP Number) December 31, 2002 ----------------------------------------------------------- (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) o Rule 13d-1(c) o 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 ("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 Page 2 of 6 CUSIP No. 929566107 Wabash National Corporation ------------------------------------------------------------------------------ 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Berger Small Cap Value Fund/3/ ID No. 36-3344166 ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |_| (b) |_| ------------------------------------------------------------------------------- 3 SEC USE ONLY ------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Massachusetts ------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES -0- ----------------------------------------------------- BENEFICIALLY 6 SHARED VOTING POWER OWNED BY 2,100,000/2/ ----------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING -0- ----------------------------------------------------- PERSON 8 SHARED DISPOSITIVE POWER WITH 2,100,000/2/ ------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,100,000 ------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES |_| ------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 8.19% ------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON IV ------------------------------------------------------------------------------- /2/ Perkins, Wolf, McDonnell & Company is the sub investment advisor delegated with investment and voting authority. /3/ Berger Small Cap Value Fund (the "Fund")is a portfolio series established under the Berger Omni Investment Trust, an open-ended management investment company registered under the Investment Company Act of 1940, as amended. Due to a restructuring of the investment advisor of the Fund, future ownership disclosure will be filed jointly with the Fund's sub-investment advisor, Perkins, Wolf, McDonnell & Company. Schedule 13G Page 3 of 6 CUSIP No. 929566107 Wabash National Corporation ------------------------------------------------------------------------------ Item 1. (a) Name of Issuer: Wabash National Corp. (b) Address of Issuer's Principal Executive Offices: 1000 Sagamore Pkwy. South, Lafayette, IN 47905 Item 2. (a) Name of Person Filing: (1) BERGER SMALL CAP VALUE FUND/4/ (b) Address of Principal Business Office: (1) BERGER SMALL CAP VALUE FUND 210 University Boulevard Denver, Colorado 80206 (c) Citizenship: (1) Berger Small Cap Value Fund: MASSACHUSETTS (d) Title of Class of Securities: Common Stock (e) CUSIP Number: 929566107 Item 3. If this statement is filed pursuant to Rule 13d-1(b), or 13d-2(b), check whether the person filing is a: (a) ________ Broker or Dealer registered under Section 15 of the Act (b) ________ Bank as defined in section 3(a)(6) of the Act (c) ________ Insurance Company as defined in section 3(a)(19) of the Act (d) ___X____ Investment Company registered under section 8 of the Investment Company Act. (e) Investment Adviser registered under section 203 of ________ the Investment Advisers Act of 1940 /1/ /4/ Berger Small Cap Value Fund (the "Fund")is a portfolio series established under the Berger Omni Investment Trust, an open-ended management investment company registered under the Investment Company Act of 1940, as amended. Due to a restructuring of the investment advisor of the Fund, future ownership disclosure will be filed jointly with the Fund's sub-investment advisor, Perkins, Wolf, McDonnell & Company. Schedule 13G Page 4 of 6 CUSIP No. 929566107 Wabash National Corporation ------------------------------------------------------------------------------- (f) ________ Employee Benefit Plan, Pension Fund which is subject to the provisions of the Employee Retirement Income Security Act of 1974 or Endowment Fund; see section 240.13d-1(b)(1)(ii)(F) (g) Parent Holding Company, in accordance with ________ section 240.13d-1(b)(1)(ii)(G) (Note: See Item 7) /2/ Item 4. Ownership (a) Amount Beneficially Owned: (1) Berger Small Cap Value: 2,100,000 ------- (b) Percent of Class: (1) Berger Small Cap Value: 8.19% -------- (c) Number of shares as to which such person has: (1) Berger Small Cap Value: (i) Sole power to vote or to direct the vote: 0 ------ (ii) Shared power to vote or to direct the vote: 2,100,000/5/ ------ (iii) Sole power to dispose or to direct the disposition of: 0 ------ (iv) Shared power to dispose or to direct the disposition of: 2,100,000/5/ ------ Item 5. Ownership of Five Percent or Less of a Class: N/A /5/ Perkins, Wolf, McDonnell & Company is the sub investment advisor delegated with investment and voting authority. Schedule 13G Page 5 of 6 CUSIP No. 929566107 Wabash National Corporation ------------------------------------------------------------------------------- Item 6. Ownership of More than Five Percent on Behalf of Another Person: N/A Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company: N/A Item 8. Identification and Classification of Members of the Group: N/A Item 9. Notice of Dissolution of Group: N/A Item 10. Certification: By signing below I certify that, to the best of my 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 such securities and were not acquired and are not held in connection with or as a participant in any transaction having such purpose or effect. Schedule 13G Page 6 of 6 CUSIP No. 929566107 Wabash National Corporation ------------------------------------------------------------------------------- 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. BERGER SMALL CAP VALUE FUND: March 14, 2003 ------------------------------------------- Date /S/Anthony R. Bosch ------------------------------------------- Signature Anthony R. Bosch, Vice President ------------------------------------------- Name/Title