Livermore, Calif.-based FormFactor Inc. (Nasdaq:FORM) is off 14% today after analysts at Oppenheimer downgraded the stock after the open to “perform” from “outperform.” The research firm said the semiconductor product manufacturer should expect revenues on the low side of second-quarter estimates.

In today’s trading, FormFactor is at $16 at 2:01 p.m. ET, down $2.50 from Tuesday’s close. Since January, the stock has shed 52%. During the past year, shares have ranged from $15.56 to $48.48. Trading volume today is at nearly 2 million shares, well above the average of about 800,000 shares.

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