Stocks that moved substantially or traded heavily Friday on the New York Stock Exchange and Nasdaq Stock Market:
Southern Union Co., up $5.70 at $39.85
Williams Cos. Inc. announced a $4.9 billion bid to buy the gas pipeline company, topping an earlier offer from rival Energy Transfer Equity.
STR Holdings Inc., down $2.39 at $14.33
The maker of solar module products cut its second quarter earnings and revenue forecasts on weaker demand in certain countries.
United Continental Holdings Inc., down $2.15 at $22.99
The operator of United Airlines and Continental Airlines issued a second-quarter outlook that was lower than what analysts had expected.
Discover Financial Services, up 90 cents at $24.79
Shares of the credit card issuer rose a day after the company said its profit more than tripled in the second quarter.
Blackboard Inc., up $3.17 at $43.94
The Wall Street Journal reported that Providence Equity Partners is nearing a deal to acquire the educational software provider.
Majesco Entertainment Co., up 11 cents at $2.96
The maker of the "Cooking Mama" and "Zumba Fitness" video games said its stock will be added to the Russell Microcap Index.
Micron Technology Inc., down $1.22 at $7.21
The chipmaker reported third-quarter results that missed analyst estimates as sales of the company's chips fell.
Pain Therapeutics Inc., down $3.94 at $5.30
Regulators rejected the biopharmaceutical company's pain drug Remoxy, which was developed in partnership with Pfizer and Durect.