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Wednesday's Late Winners & Losers

Comtech Communications shares jump on an earnings beat.

Comtech Telecommunications

(CMTL) - Get Report

was among the after-hours winners Wednesday, amid a generally mixed bag of trading.

The Melville, N.Y.-based communications-equipment maker climbed after sprinting past Wall Street estimates. The company reported fiscal fourth-quarter income of $17.1 million, or 63 cents a share, including a net 4-cent loss on stock-option-related items. Analysts were looking for 44 cents a share, according to Thomson Financial. Sales came in at a better-than-expected $117.8 million.

Comtech shares gained 85 cents, or 1.7%, to $51 in recent extended trading.

Louisiana's

Superior Energy Services

(SPN)

, a purveyor of oil field services and equipment, said it will buy back up to $350 million of its shares through the end of 2009. Shares were gaining 48 cents to $37.76.

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On the losing side,

BioCryst Pharmaceuticals

(BCRX) - Get Report

plummeted more than 30% on

disappointing results from its influenza-treatment candidate, peramivir. Midphase testing failed to achieve the primary endpoint, which concerned the time span to alleviating flu symptoms, vs. a placebo. The Birmingham, Ala.-based company also said that a single dose induced some improvement, but not at a statistically significant level. Shares surrendered $3.60 to $8.18.

Interior furnishings maker

Herman Miller

(MLHR) - Get Report

, meanwhile, dropped 4.2% after disappointing investors with its fiscal second-quarter outlook. The company said it expects earnings of between 51 cents and 57 cents a share, or 2 cents under the mean target. The company's forecasted revenue range, between $475 million and $500 million, also is below par. The Zeeland, Mich.-based company beat on both top and bottom lines in the most recent quarter, but shares were still off $1.23 to $27.85.