The Yahoo historical prices section will take you back to 1993. Du Pont Pharmaceutical's top scientific guys refused to go along when Bristol Myers bought their company, and formed Incyte. I believe that was in 1991. That's why they are headquartered in Wilmington Delaware, not exactly a Mecca for biotech. . The price dropped when their first drug, a potential best in class HIV drug, had to be canned because of liver toxicity, but they kept going and have produced a potential powerhouse.
I seem to recall selling some INCY at close to $300 in early 2000 way before the bubble burst. I think the history data is now normalized / corrected / weighted and so it may show $120.
I sure hope future will get us there and we see those numbers again.