(Corrects spelling in August 28 article of Blackstone chief executive's name to Schwarzman from Schwartzman in paragraph 3)
* Settlement averts Sept. 16 trial
* Accord requires approval of federal judge in Manhattan
By Nate Raymond
NEW YORK, Aug 28 (Reuters) - Blackstone Group LP has agreed to pay $85 million to settle an investor class action lawsuit accusing the private equity giant of not disclosing bad investments before its $4.7 billion initial public offering in 2007.
The proposed deal follows more than five years of litigation between investors and Blackstone and helps the world's largest private equity firm avert a rare securities class action trial that was due to begin Sept. 16.
The settlement, disclosed in court papers filed Wednesday in U.S. District Court in Manhattan, also covers claims against individuals including Stephen Schwarzman, Blackstone's chief executive.
Blackstone spokesman Peter Rose declined to comment. The company continues to deny wrongdoing as part of the settlement, court papers state.
Lawyers for the plaintiffs said in court papers the settlement represents about 12 percent of the $691.5 million they believed were achievable at trial.
Investors contended Blackstone did not properly disclose at the time of offering that its investments in a bond insurer, a semiconductor company and real estate were declining in value.
As a result, investors alleged that there was an increased risk Blackstone's potential performance fees would be "clawed back" by limited partners.
Blackstone offered up 153 million common units at $31 a piece at the time of its June 2007 IPO. By the time plaintiffs filed an amended complaint in October 2008, they were trading at about $7.75 a unit.
Shares in Blackstone closed up 25 cents, or 1.17 percent, at $21.65 on Wednesday on the New York Stock Exchange.
U.S. District Judge Harold Baer, who must approve the settlement, initially dismissed the case in September 2009.
But in February 2011, the 2nd U.S. Circuit Court of Appeals in New York revived the case. The U.S. Supreme Court rejected Blackstone's further appeal in October 2011.
At the time of the settlement, the parties had been awaiting a decision by Baer on whether to again dismiss the case, this time following depositions and document discovery.
David Brower, a lawyer for the lead plaintiffs Martin Litwin and Francis Brady at the law firm Brower Piven, in an email said he was "very pleased with the result."
The case is Landmen Partners Inc v. Blackstone Group LP, U.S. District Court, Southern District of New York, No. 08-3601. (Additional reporting by Gregory Roumeliotis; Editing by Gary Hill and Edwina Gibbs)