If completed, the takeover would create the world's largest pharmaceutical company.
If successful, the takeover would create the first trans-Atlantic stock exchange.
The takeover created one of Australia's biggest speciality apparel retailers, with 517 stores and $679 million in annual sales.
A successful takeover could create a stronger opponent for Microsoft - breathing competition into an increasingly concentrated software market.
The takeover of space exploration by private enterprise would create millions of jobs.
The takeover by G4S will create a business with combined revenue of £15.9bn, based on the companies' 2010 results.
If successful, the takeover will create the world's eighth-largest oil company.
According to Mirant, the takeover would create annual cost savings of $150 million from paring overlapping functions.
The takeover effectively creates China's largest investment bank.
The takeover would create one of the largest distributors of natural gas.