The market scorched higher today. Buyers pushed the market

The following companies with market capitalizations under $500 million established new 52-week lows Thursday:

April 19 (SmallCapInvestor.com) – Stocks are trading lower this morning following a drop in the Shanghai stock market and a smaller-than-expected fall in U.S. jobless claims.  In small cap action, news of an expected loss in the first quarter lowered shares of Power-One Inc. (Nasdaq: PWER) and TVI Corporation (Nasdaq: TVIN).

At 10:40 AM the Russell 2000 was down 5.42 points, or 0.66 percent, to 818.96.  The Dow Jones Industrial Average had lost 23.73 points, or 0.19 percent, to 12,780.11.

Shares of Power-One Inc. (Nasdaq: PWER) fell in after-hours trading today after the power conversion products manufacturer issued lowered revenue guidance for the first quarter ended March 31.

Camarillo, Calif.-based Power-One said its North American business did not achieve anticipated forecasts.

The company will release full results on May 1. It then expects to report a net loss of about $0.14 per share on revenue of $124 million.

The following small-cap companies were making news in after-hours trading Wednesday:

Avici Systems Inc. (Nasdaq: AVCI) plunged $3.04, or 22.5%, to $10.50 on unusually heavy volume after the routing systems provider announced plans to transition away from core router development to focus on its new product initiative, Soapstone Networks. The company also announced a special dividend of $2 per share and released its first quarter financial results, which included a profit of $6 million, or $0.42 a share.