In a statement, Nasdaq OMX said the company will be merged with its Pinpoint Market Intelligence service to create a single entity providing market surveillance services to around 3,900 Nasdaq-listed firms, as well as corporations trading on the New York Stock Exchange.
The combined company will work on behalf of its client firms to identify buyers and sellers who move their stock price.
It will also provide guidance on investment characteristics and the potential motivations behind the sales and purchases of different shares.
Nasdaq OMX president Magnus Bocker said: "With market volatility and uncertainty the norm, a trusted advisor is more important than ever.
"With this acquisition, Nasdaq OMX now has the most experienced team and best intellectual capital in the shareholder analysis business."
In other news, Nasdaq OMX has announced that Seagate Technology, a manufacturer of computer hard disks and data storage devices, is to join the Nasdaq 100 index of shares.