FILE NO. 333-39067
FILED PURSUANT TO RULE 424(b)(3)
IMCLONE SYSTEMS INCORPORATED
SUPPLEMENT NO. 1
TO PROSPECTUS DATED FEBRUARY 12, 1998
The table on page 19 of the prospectus is hereby amended to reflect the
transfer of the options held by High River Limited Partnership to purchase
450,000 shares of common stock to Stork Associates Limited Partnership, an
affiliate of High River Limited Partnership. The information set forth below
relates to the shares underlying the options, including the shares the holder
would own if it were to sell the shares that the prospectus covers, which
shares have not been sold.
NUMBER OF NUMBER OF
SHARES OF SHARES OF
COMMON STOCK NUMBER OF COMMON STOCK
NAME OF SELLING OWNED PRIOR SHARES OWNED AFTER
STOCKHOLDER TO OFFERING OFFERED THE OFFERING
Stork Associates 450,000 450,000 0
Limited Partnership
The initially capitalized terms used herein shall have the same meaning
as specified in the Prospectus.
THE DATE OF THIS SUPPLEMENT IS MARCH 10, 2000
