October 23, 2012 - The court approved the settlement, entered the orders approving the plan of allocation, the motion for attorneys’ fees and expenses, and dismissed the action with prejudice.
May 21, 2012 - The court preliminarily approved the settlement.

May 14, 2012 - Parties filed a stipulation of settlement.

September 24, 2010 - The court granted a defendant's motion to dismiss, dismissing with prejudice, any and all claims against a particular defendant and the court denied the defendants' remaining motions to dismiss.

December 17, 2009 - The defendants filed motions to dismiss.

October 19, 2009 - The lead plaintiff filed a second amended complaint.

September 15, 2009 - The court denied the defendants' motions to dismiss as moot and granted lead plaintiff leave to file an amended complaint.

November 25, 2008 - The defendants filed motions to dismiss.

September 22, 2008 - The lead plaintiff filed an amended complaint.

July 23, 2008 -The lead plaintiff and lead counsel were appointed.

June 30, 2008 - A lead plaintiff motion was filed.

April 30, 2008 - An investor in shares of Arbitron Inc (NYSE: ARB no longer trading, company acquired by Nielsen Holdings NV) filed a lawsuit in the U.S. District Court for the Southern District of New York against Arbitron Inc over alleged violations of of Federal Securities Laws between February 19, 2007 and November 26, 2007.

Specifically, the complaint alleges that, between February 19, 2007 and November 26, 2007, defendants issued materially false and misleading statements that misrepresented and failed to disclose: (i) that Arbitron Inc's scheduled implementation of its Portable People Meter ratings service in certain major markets was not performing according to internal expectations and Arbitron Inc was experiencing significant difficulties such that it would have to delay its implementation; and (ii) as a result, defendants lacked a reasonable basis for their positive statements about the timing of the implementation of Arbitron Inc's Portable People Meter ratings service and Arbitron Inc's prospects and future earnings.

On November 26, 2007, Arbitron Inc announced that it [would] delay the commercialization of its Portable People Meter (PPM) radio ratings service in nine markets and that Arbitron Inc would be revising its financial guidance for 2007 and its outlook for 2008. In response to this announcement, the price of Arbitron Inc common stock (NYSE: ARB) declined $7.21 per share, or over 14.74%, to close at $41.70 per share, on unusually high trading volume.

Arbitron Inc (now known as Nielsen Audio), through its subsidiaries, provides media and marketing information services in the United States and internationally. Arbitron Inc's Portable People Meter ratings service is purportedly capable of measuring radio, broadcast television, cable television, Internet broadcasts, satellite radio and television audiences, and retail store video and audio broadcasts.