• by Joe Mandese  @mp_joemandese, January 28, 2016

In separate meetings, the shareholders of comScore and Rentrak voted to approve their proposed merger. Effective with the close of business Friday, Rentrak will become a wholly owned subsidiary of comScore.

As a result of the merger, comScore will join the S&P MidCap 400 index, moving from the S&P SmallCap 600 index.

One of the biggest investors in Rentrak heading into the merger, and a big investor in comScore coming out of it, is WPP Group.