Stocks were mostly backtracking from their regular-session gains after the closing bell Tuesday, but among the few big winners was semiconductor test systems maker

Verigy

( VRGY).

Shares surged nearly 16% after the Singapore-based company powered past analyst estimates for the quarter ended Oct. 31. Non-GAAP income jumped 12.9% to a reported $35 million, or 58 cents a share, on revenue that gained 3.5% year over year to $209 million. Analysts polled by Thomson Financial were looking for earnings of just 50 cents a share on $200 million in sales.

Verigy also projected next-quarter revenue of between $195 million and $205 million, which would beat Wall Street targets by at least $14.7 million. Additionally, the company board approved a $150 million share-buyback program for repurchase of up to 10% of its shares outstanding. Verigy stock leapt $3.35 to $24.40 in recent after-hours trading.

Interior-furnishings maker

Herman Miller

(MLHR) - Get Report

, meanwhile, bumped up its fiscal second-quarter earnings guidance to between 56 cents and 63 cents a share, vs. the prior outlook of 51 cents to 57 cents a share. The Michigan-based company also expects revenue to hover around the high end of the prior forecasted range, $475 million to $500 million. Analysts are looking for a top line of $492.6 million.

Shares underwent choppy trading after the announcement but lately were adding 6.9% to $25.16.

Analog Devices

(ADI) - Get Report

also saw mixed trading after its latest earnings report. The Norwood, Mass.-based chipmaker said fiscal fourth-quarter income

plunged 29.3% year-over-year to $97.9 million, or 31 cents a share. Excluding heavy restructuring expenses, however, the figure comes to 39 cents a share. Analysts, who typically exclude one-time items from their estimates, were looking for 39 cents.

Following some wavy action, Analog shares were up 78 cents, or 2.5%, to $32.

But

Wells Fargo

(WFC) - Get Report

fell hard after the San Francisco-based bank announced it will

set aside $1.4 billion in pretax money to cover losses from its riskiest mortgage-lending channels. Wells said it has stopped originating and acquiring new loans through those channels, and that this $11.9 billion "liquidating portfolio" constitutes 3% of its total loans as of Sept. 30. Shares gave up $1.35, or 4.5%, to $28.48.

Meanwhile, Californian chipmaker

Semtech

(SMTC) - Get Report

slumped after predicting that fiscal fourth-quarter revenue will be flat to down 4% sequentially. Third-quarter sales totaled $78.6 million. The Street is seeking a slight rise to $79.9 million. GAAP-based earnings will come to 25 cents to 26 cents a share, said Semtech, including a one-time, 7-cent gain from a legal settlement. Analysts are seeking 23 cents a share.

The company beat on both top and bottom lines in the third quarter, but shares still sank 6.7% to $14.83.