Stocks that moved substantially or traded heavily Wednesday on the New York Stock Exchange and Nasdaq Stock Market:
Halliburton Co., up $1.51 at $34.17
The oil services company's first-quarter profit rose as the oil industry aggressively searched for new oil fields in North America.
United Rentals Inc., up $4.84 at $45.75
The heavy-equipment-rental company reported a first-quarter profit that easily topped what Wall Street analysts were expecting.
Polaris Industries Inc., up $7.37 at $80.50
Thanks to strong sales of its off-road vehicles and motorcycles, the company said its first-quarter profit jumped 27 percent.
Yahoo Inc., up 48 cents at $15.49
The Internet company said that is first-quarter net income rose 28 percent under its new chief executive officer Scott Thompson.
Illumina Inc., up 51 cents at $44.51
Swiss drugmaker Roche said it will end its offer to buy the U.S. diagnostics firm. The deal was worth about $6.5 billion.
Catalyst Health Solutions Inc., up $21.69 at $85.23
SXC Health Solutions Corp. plans to buy the fellow pharmacy benefits manager in a deal the companies said was worth $4.4 billion.
Knology Inc., up $1.35 at $19.40
Wow Internet, Cable & Phone is buying the cable and Internet provider for $750.5 million, partly to broaden its geographic reach.
THQ Inc., up 12 cents at 57 cents
The video game maker said that it expects its fourth-quarter adjusted loss and revenue will be above Wall Street's expectations.