U.S. stocks ended higher on Monday, with the Nasdaq closing at a record as hopes grew that a deal would be reached to prevent Greece from defaulting on loans.

Surging investment by Chinese companies in U.S. research labs is yielding a fast-growing trove of patents, part of a push to mine America for ideas to help China shift from being the world's factory floor to a driver of innovation.

Energy Transfer Equity LP confirmed it had made a $48 billion unsolicited bid for natural gas pipeline company Williams Companies Inc, hours after Williams rejected the offer as significantly too low.

Investment adviser Mitch Tuchman scored a deal any traveler would be proud of: $280 a night for a recent stay at the luxurious Viceroy Hotel in Manhattan, where the going rate can exceed more than $500 on a weeknight.

U.S. health insurer Anthem Inc (ANTM.N) said on Saturday it had offered $47 billion in cash and stock for smaller rival Cigna Corp (CI.N), signaling a pick-up in the industry's long-awaited consolidation.

Billionaire investor Carl Icahn said thanks but no thanks when real estate mogul turned Republican presidential candidate Donald Trump floated his name for U.S. Treasury secretary.

Twitter Inc (TWTR.N) will start curating tweets on live events, the microblogging service said, as it plans major changes to make its real-time news feed more user friendly.

General Motors Co (GM.N) said on Thursday that Fitch Ratings had raised the credit ratings of both GM and GM Financial to investment grade.

U.S. officials will press their Chinese counterparts on currency policy at high-level talks next week, and have not taken off the table the possibility that the United States may one day join a China-led infrastructure bank, a senior U.S. Treasury official said.

The Nasdaq Composite on Thursday erased its last standing milestone from the dot-com era as it set a record intraday high, with stocks on Wall Street in rally mode boosted by strong economic data.