Nasdaq (NASDAQ: NDAQ) had a bumpy ride this week, its share price plummeting 9.6% as of Friday morning at 9:30 a.m. ET, according to S&P Global Market Intelligence. Nasdaq was trading at about $52 per share at the market open on Friday, down about 15% year to date.

It dropped in what turned out to be a solid week for the markets as the S 500 had gained 3%, the Dow Jones Industrial Average had climbed 1.6%, and the Nasdaq Composite had jumped 3.9% this week on Friday at the opening bell.

Nasdaq, the company that runs the Nasdaq stock exchange, made a big splash this week, announcing on Monday that it was acquiring Adenza, a software company that offers risk management and regulatory compliance services for companies. In other words, it tracks companies' spending and makes sure they're in compliance. 

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Source Fool.com