Friday's Small-Cap Winners & Losers

Updated from 1:31 p.m. EST with new stock prices

Small-cap stocks ended a volatile week with another tumble Friday, joining the broader market for a downhill ride. The Russell 2000 lost 0.5% at 702.02, and the S&P SmallCap 600 was down 0.5% to 370.08.

Among the day's biggest losers was Aspen Technology (AZPN Quote). Shares of the Burlington, Mass.-based maker of industrial-process optimization software fell 5.7% to $12.71 after it announced it would be delisted from the Nasdaq and begin trading on Pink Sheets effective Feb. 19.

Also losing ground, Ultralife Batteries (ULBI Quote) shares dropped 16.9% to $14.04 after forecasting a fourth-quarter operating loss of about $2.5 million on revenue of $36.5 million. The Newark, N.Y.-based company had previously guided for a profit in the range of $2.7 million to $3.5 million on $41 million to $44 million in revenue. Analysts polled by Thomson Financial are looking for an operating profit of $3 million. ...