July 21- Network-gear maker Extreme Networks estimated fourth-quarter adjusted profit and revenue above analysts' expectations, helped mainly by new business in North America. Shares in Extreme Networks jumped 13 percent to $4.94 in premarket trading.
**ARQULE INC, $2.30, down 53.9 pct The biotechnology company and Japan's Daiichi Sankyo Co Ltd. **GENERAL MOTORS, $23.82, up 3 pct. Hedge fund manager David Einhorn said auto-maker General Motors "is much healthier now," and is getting its product refreshments "right."
Check out which companies are making headlines after-the-bell Monday: