SAP Acquires Ariba

Cost: $4.3 Billion

SAP, who is turning itself from a casual enterprise software company into a cloud company, has made one of the biggest acquisitions this year. For a whopping $4.3 billion, it has acquired Ariba, a cloud based ecommerce company which helps companies make purchases and collaborate with their suppliers. SAP has already started to integrate its enterprise software with Ariba network.

Read: 10 Technologies That Changed Business Forever

Cisco Nets NDS Group

Cost: $5 Billion

Probably, in one of the biggest acquisitions in its history, Cisco purchased NDS Group, a video software and content security company, for $5 billion. NDS specializes in managing how service providers and media firms deliver video content. Cisco plans to use the U.K.-based company’s Videoscape home entertainment platform by combining it with the hardware giant’s existing networking and video offerings.

Read: 12 Best Online Shopping Sites In India

Softbank Buys Sprint Nextel

Cost: $20.1 Billion

The biggest tech acquisition of 2012 is held by the telecom sector. In a deal which cost $20.1 billion, Softbank, Japan's third-largest mobile carrier, bought majority stake in Sprint Nextel, the third largest mobile carrier in the U.S. According to Sprint Nextel, the addition of Softbank experience will help it become more competitive in the U.S. mobile carrier market. In addition, Sprint Nextel has already used some of the $20.1 billion from Softbank to acquire U.S. Cellular's Midwestern U.S. spectrum and customers.