Typically, when investors talk about Nasdaq (NASDAQ: NDAQ), they are referring to the Nasdaq Composite index, or perhaps the abridged Nasdaq-100, but Nasdaq is also a company that runs the eponymous exchange, and today its stock was tumbling.

As of 3:12 p.m. ET, the stock was down 11.3% on news that it would buy financial software company Adenza from Thoma Bravo for $10.5 billion.

The deal would be the biggest ever for the stock market exchange, and the company argued that it accelerates its "strategic vision to become the trusted fabric of the world's financial system."

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Source Fool.com