Among the sector activity stories for Thursday, July 3, from AP Financial News:

Shares of Nvidia Corp. lost nearly a third of their value Thursday after the graphics chip maker cut its second-quarter revenue guidance, prompting a spate of analysts to cut their ratings and earnings expectations on the stock.

Two analysts on Thursday slashed their price targets for Nvidia Corp., saying they are concerned about the company's margins, after the graphics chip maker lowered its second-quarter revenue outlook.

Among the earnings projection stories for Wednesday, July 2, from AP Financial News:

By Kristina Cooke

NEW YORK (Reuters) -The Dow rose on Thursday, a day after the blue-chip average entered a bear market, on relief payrolls data was not as weak as some had feared and with another record oil price boosting energy shares.

The Nasdaq 100 index rose slightly in an abbreviated trading session Thursday as Wall Street weighed record-high crude oil prices and reports showing a drop in the service sector, but an unchanged unemployment rate.

Shares of semiconductor companies mostly fell Thursday, with Nvidia Corp. losing nearly a third of its value after the graphics chip maker reduced its fiscal second-quarter revenue outlook.

Shares of United Technologies Corp. rose in a short trading session Thursday, as the Dow Jones industrial average recovered from an annual low.

Continued reports that Yahoo Inc. is lining up allies in its attempt to fend off Microsoft Inc.'s pursuit of its online search engine business sent shares of the Internet pioneer higher in premarket trading Thursday.

Shares of Lehman Brothers Holdings Inc. dropped on Monday and kicked off a holiday-shortened week of trading, on talk Barclays PLC will buy the country's fourth-biggest investment bank at a discount.

Shares of Nvidia suffered their worst one-day loss in more than three years Thursday, a day after the graphics chipmaker reported the first weakening of gross margin in 13 quarters and concerns mounted over competitive risks from rivals ATI and Intel.