American Woodmark

Ticker: AMWD

Friday's close: $35.95

Week's change: +13.72%

The Winchester maker of kitchen cabinets and vanities reported that quarterly sales increased 15 percent, at the high end of expectations, although second-quarter profit slipped because of persistent problems with high material and manfacturing costs.

Trex

Ticker: TWP

Friday's close: $23.55

Week's change: -9.29%

The Winchester maker of simulated wood decking was downgraded to "strong sell" from "strong buy" by analyst Ivan Feinseth at Matrix USA. Trex has faced problems including rising costs for the plastic in its products and efficiency problems at a manufacturing plant.

Carmax

Ticker: KMX

Friday's close: $31.40

Week's change: +9.45%

The Richmond company, which is the largest U.S. dealer of used cars, raised its forecast for second-quarter sales and profit. Sales at locations open a year or more are projected to rise about 10 percent.

Optelecom-NKF

Ticker: OPTC

Friday's close: $14.15

Week's change: +8.17%

The Germantown company that provides systems to send data, video and audio over networks said it won a subcontract worth up to $1 million a year to supply video security and traffic-control equipment for use on "smart" transportation systems in South Carolina.