Investment firm Madison Dearborn Partners on Thursday agreed to acquire 51 percent of TransUnion, one of the largest credit-information firms, from its current owners, the Chicago-based Pritzker family.

Penny Pritzker, chairwoman of TransUnion, said the transaction will help it capitalize on growth opportunities. Terms of the agreement were not disclosed. (Reporting by Joseph A. Giannone; editing by Andre Grenon)

Greece has sealed a deal with the European Union and IMF that opens the door to a multi-billion euro financial bailout and will require big sacrifices from the Greek people, Prime Minister George Papandreou said on Sunday. [Read the full article]

UAL Corp's (NasdaqGS:UAUA - News) United Airlines and Continental Airlines Inc (NYSE:CAL - News) are expected to announce that they are merging to form the world's largest airline on Monday, the Wall Street Journal reported on Thursday, citing unnamed sources.

Continental's board would meet on Friday and Sunday, and United's would meet on Friday, the newspaper said on its website.

United declined to comment and Continental did not immediately respond to a request for comment.

Meanwhile, a source close to the situation told Reuters that concern over the share-price ratio to be used in a potential stock swap was "no longer an issue" and added that an announcement of the deal would likely be made early next week.

The two U.S. airlines resumed merger negotiations earlier this month, two years after walking away from similar talks. [Read the full article]