Stock Trading History of Howerton Michael

The following table details the trading activities (stock purchases, stock sales, and stock option exercises) reported to the Securities and Exchange Commission (SEC) by insider Howerton Michael since year 2005. The trader's CIK number is 1177076. At the time of this reporting, Howerton Michael is the SVP, Chief Financial Officer of Imclone Systems Inc/de (stock ticker symbol IMCL).

Stock purchases, sales, and option exercises reported by *Howerton Michael* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2006-10-05	IMCL	Imclone Systems Inc/de	Sale	10,436	29.33	306,129
2006-10-05	IMCL	Imclone Systems Inc/de	Option Exercise	10,000	6.94	69,400
2006-08-25	IMCL	Imclone Systems Inc/de	Sale	6,250	30.01	187,591
2006-08-25	IMCL	Imclone Systems Inc/de	Option Exercise	6,250	11.91	74,437
2006-05-12	IMCL	Imclone Systems Inc/de	Sale	2,800	40.00	112,000
2006-05-12	IMCL	Imclone Systems Inc/de	Option Exercise	2,800	6.94	19,432
2006-05-10	IMCL	Imclone Systems Inc/de	Option Exercise	2,200	6.94	15,268
2006-05-10	IMCL	Imclone Systems Inc/de	Sale	2,200	40.00	88,000

Insider trading activities including stock purchases, stock sales, and option exercises listed in the above table cannot be completely guaranteed as to their accuracy. For more information regarding the trades made by Howerton Michael (SVP, Chief Financial Officer of Imclone Systems Inc/de at the time of this reporting) see the Securities and Exchange Commission (SEC) website.