1
PROSPECTUS SUPPLEMENT                      


                                  $80,500,000

                                      NABI

                 6 1/2% Convertible Subordinated Notes due 2003
                                      and
               Shares of Common Stock, Par Value $.10 Per Share,
                        Issuable Upon Conversion Thereof


        This Prospectus Supplement (the "Supplement") relates to the resale by
Forum Capital Markets, LP ("Forum") of up to $1,855,000 aggregate principal
amount of 6 1/2% Convertible Subordinated Notes due 2003 (the "Notes") of NABI,
a Delaware corporation (the "Company"), originally issued in private placements
consummated on February 7 and March 6, 1996 (the "Debt Offering"), pursuant to
NABI's Registration Statement on Form S-3 (No. 333-2253) (the "Registration
Statement"). This Supplement should be read in conjunction with the Prospectus
dated May 3, 1996, as supplemented to date (the "Prospectus"), to be delivered
with this Supplement. All capitalized terms used but not defined in this
Supplement shall have the meanings given them in the Prospectus.

        Based on information provided to the Company, the aggregate principal
amount of the Notes that are currently beneficially owned by Forum is
$1,855,000, all of which may be sold at this time pursuant to the Prospectus as
supplemented hereby. Additional information concerning the Selling
Securityholders (including Forum) may be set forth from time to time in
additional supplements to the Prospectus. The total outstanding aggregate
principal amount of the Notes is $80,500,000.

        The closing price of the Company's Common Stock as reported on The
Nasdaq National Market on May 19, 1997 was $6.875 per share.

        The Notes will be subordinated to all existing and future Senior
Indebtedness of the Company. At December 31, 1996, Senior Indebtedness was
approximately $2,400,000. The Indenture contains no limitations on the
incurrence of additional indebtedness or other liabilities by the Company.

        The Notes are neither listed on a national securities exchange nor
quoted on an automated quotation system. However, the Notes are eligible for
trading in the Private Offerings, Resales and Trading through Automated
Linkages ("PORTAL") Market. Notes sold pursuant to the Registration Statement
will no longer be eligible for trading in the PORTAL Market.

            The date of this Prospectus Supplement is May 20, 1997.