WHOOSH! Latest to ride the biotech roll-er-coaster: Gilead Sciences. On May 20, it announced promising results for PMPA, a drug that combats an HIV-like virus in monkeys. Shares soared from 33 to 39. Four days later, disappointment at early findings on a genital herpes drug drove the stock to 33 3/4 on May 28. Montgomery Securities' Mark Simon says the market overreacted both times, and Gilead's outlook is hopeful. EDITED BY KELLEY HOLLAND

Updated June 14, 1997 by bwwebmaster
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