Endpoint security vendor Digital Guardian has bought Code Green Networks, which makes data loss prevention appliances for businesses. The purchase gives Digital Guardian a DLP offering that, rolled in with the company's existing products, will provide endpoint, network and cloud data protection overseen by a single console, the company says.

Earlier today, Dell officially announced that it plans to acquire data storage giant EMC in a deal worth $67 billion. To say that the deal is big would be something of an understatement -- it is the single largest tech-only acquisition of all time, and worth more than the next four acquisitions combined.

NEW YORK ( TheStreet) -- Shares of Pandora dropped by 4.6% Wednesday, closing at $20.98, after the Oakland-based Internet radio company said it would buy Ticketfly, a ticket marketer, for $450 million. "We believe this acquisition closes the loop for Pandora by creating a one-stop-shop for artist discovery, marketing and concert ticket sales," John Egbert, a Stifel Nicolaus analyst, told the Associated Press.

NORCROSS, Ga. - Hi-Tech Pharmaceuticals continues to grow its sports nutrition base with the acquisition of iForce Nutrition, the company announced Friday. "The combination of these two great companies accelerates Hi-Tech's sports nutrition growth strategy, substantially boosts our sports nutrition portfolio and diversifies our business stream," stated Jared Wheat, Hi-Tech chairman, president and CEO.

Google is a computer software and a web search engine company that has been acquiring, on average, more than one company per week since 2010. The table below is an incomplete list of acquisitions, with each acquisition listed being for the respective company in its entirety, unless otherwise specified.

Dell's $67 billion purchase of EMC is the biggest pure tech acquisition ever. (AOL's $162 billion buy of Time Warner in 2000 was larger, but Time Warner was a media company, not a tech company.) This chart from Statista shows some of the largest tech acquisitions of the past decade, measured in 2015 dollars.

Dell's proposed $67 billion acquisition of data storage company EMC is the most expensive ever done involving two technology companies. Many of the tech industry's other notable deals haven't panned out as well as the buyers planned. Here's a look back at some of those past acquisitions:

Tech M&A Mania Cisco Systems Inc., the world's largest maker of networking equipment, estimates that by 2015 the data equivalent of all movies ever made will cross Internet networks every five minutes. How to manage all that data is what will be driving technology mergers and acquisitions in 2012.

The Cable Show, the industry's annual gathering that's happening this week under the blazing Los Angeles sun, had no shortage of news to pick apart given Comcast's $45 billion deal to buy Time Warner Cable announced in February as well as the deal Comcast cut with Charter Communications announced Monday.