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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* North American Biologicals, Inc. (now NABI) (Name of Issuer) Common Stock (Title of Class of Securities) 628716 10 2 (CUSIP Number) *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). Page 1 of 7 Pages - ----------------------- --------------------- CUSIP NO. 628716 10 2 13G PAGE 2 OF 7 PAGES - ----------------------- --------------------- - ------------------------------------------------------------------------------ NAME OF REPORTING PERSON 1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON: 36-3820584 Wanger Asset Management, L.P. - ------------------------------------------------------------------------------ CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* 2 (a) [_] Not applicable (b) [_] - ------------------------------------------------------------------------------ SEC USE ONLY 3 - ------------------------------------------------------------------------------ CITIZENSHIP OR PLACE OF ORGANIZATION 4 Delaware - ------------------------------------------------------------------------------ SOLE VOTING POWER 5 NUMBER OF None SHARES ----------------------------------------------------------- SHARED VOTING POWER BENEFICIALLY 6 None OWNED BY ----------------------------------------------------------- EACH SOLE DISPOSITIVE POWER 7 REPORTING None PERSON ----------------------------------------------------------- SHARED DISPOSITIVE POWER WITH 8 None - ------------------------------------------------------------------------------ AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9 None - ------------------------------------------------------------------------------ CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* 10 Not applicable - ------------------------------------------------------------------------------ PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 11 0% - ------------------------------------------------------------------------------ TYPE OF REPORTING PERSON* 12 IA - ------------------------------------------------------------------------------ *SEE INSTRUCTION BEFORE FILLING OUT! - ----------------------- --------------------- CUSIP NO. 628716 10 2 13G PAGE 3 OF 7 PAGES - ----------------------- --------------------- - ------------------------------------------------------------------------------ NAME OF REPORTING PERSON 1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON: Wanger Asset Management, Ltd. - ------------------------------------------------------------------------------ CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* 2 (a) [_] Not applicable (b) [_] - ------------------------------------------------------------------------------ SEC USE ONLY 3 - ------------------------------------------------------------------------------ CITIZENSHIP OR PLACE OF ORGANIZATION 4 Delaware - ------------------------------------------------------------------------------ SOLE VOTING POWER 5 NUMBER OF None SHARES ----------------------------------------------------------- SHARED VOTING POWER BENEFICIALLY 6 None OWNED BY ----------------------------------------------------------- EACH SOLE DISPOSITIVE POWER 7 REPORTING None PERSON ----------------------------------------------------------- SHARED DISPOSITIVE POWER WITH 8 None - ------------------------------------------------------------------------------ AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9 None - ------------------------------------------------------------------------------ CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* 10 Not applicable - ------------------------------------------------------------------------------ PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 11 0% - ------------------------------------------------------------------------------ TYPE OF REPORTING PERSON* 12 CO - ------------------------------------------------------------------------------ *SEE INSTRUCTION BEFORE FILLING OUT! - ----------------------- --------------------- CUSIP NO. 628716 10 2 13G PAGE 4 OF 7 PAGES - ----------------------- --------------------- - ------------------------------------------------------------------------------ NAME OF REPORTING PERSON 1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON: Ralph Wanger - ------------------------------------------------------------------------------ CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* 2 (a) [_] Not applicable (b) [_] - ------------------------------------------------------------------------------ SEC USE ONLY 3 - ------------------------------------------------------------------------------ CITIZENSHIP OR PLACE OF ORGANIZATION 4 U.S.A - ------------------------------------------------------------------------------ SOLE VOTING POWER 5 NUMBER OF None SHARES ----------------------------------------------------------- SHARED VOTING POWER BENEFICIALLY 6 None OWNED BY ----------------------------------------------------------- EACH SOLE DISPOSITIVE POWER 7 REPORTING None PERSON ----------------------------------------------------------- SHARED DISPOSITIVE POWER WITH 8 None - ------------------------------------------------------------------------------ AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9 None - ------------------------------------------------------------------------------ CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* 10 Not applicable - ------------------------------------------------------------------------------ PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 11 0% - ------------------------------------------------------------------------------ TYPE OF REPORTING PERSON* 12 IN - ------------------------------------------------------------------------------ *SEE INSTRUCTION BEFORE FILLING OUT! Page 5 of 7 Pages Item 1(a) Name of Issuer: NABI (formerly North American Biologicals, Inc.) Item 1(b) Address of Issuer's Principal Executive Offices: 5800 Park of Commerce Blvd. N.W. P. O. Box 310701 Boca Raton, FL 33431 Item 2(a) Name of Person Filing: Wanger Asset Management, L.P. ("WAM"); Wanger Asset Management, Ltd., the general partner of WAM ("WAM LTD."); Ralph Wanger ("Wanger") Item 2(b) Address of Principal Business Office: WAM, WAM LTD. and Wanger are all located at: 227 West Monroe Street, Suite 3000 Chicago, Illinois 60606 Item 2(c) Citizenship: WAM is a Delaware limited partnership. WAM LTD. is a Delaware corporation. Wanger is a U.S. citizen. Item 2(d) Title of Class of Securities: Common Stock Item 2(e) CUSIP Number: 628716 10 2 Item 3 Type of Person: (e) WAM is an Investment Adviser registered under section 203 of the Investment Advisers Act of 1940; WAM LTD. is the general partner of the Investment Adviser; Wanger is the principal stockholder of the general partner. Item 4 Ownership (at December 31, 1996): (a) Amount owned "beneficially" within the meaning of rule 13d-3: None (b) Percent of class: 0% (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: None (iii) sole power to dispose or to direct the disposition of: None (iv) shared power to dispose or to direct the disposition of: None Page 6 of 7 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 (X). 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 WAM. Persons other than WAM are entitled to receive all dividends from, and proceeds from the sale of, those shares. Item 7 Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company: 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 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 purpose or effect. Page 7 of 7 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. Date: February 14, 1997 The undersigned corporation, on the date above written, agrees and consents to the joint filing on its behalf of this Schedule 13G in connection with its beneficial ownership of the security reported herein. WANGER ASSET MANAGEMENT, LTD. for itself and as general partner of WANGER ASSET MANAGEMent, L.P. By: /s/Bruce H. Lauer ---------------------------------- Bruce H. Lauer Vice President The undersigned individual, on the date above written, agrees and consents to the joint filing on his behalf of this Schedule 13G in connection with its beneficial ownership of the security reported herein. RALPH WANGER /s/Ralph Wanger --------------------------------------