Cowen Group Announces New Hire to Health Care Research Group

Edward Nash Named Director and Senior Research Analyst

NEW YORK, Mar 10, 2011 (BUSINESS WIRE) —

Cowen Group, Inc. (“Cowen”) (NASDAQ: COWN) today announced that Edward
Nash has joined the firm as Director and Senior Research Analyst. Based
in New York, Mr. Nash will cover biotechnologyin the health care
sector of Cowen’s Research group and report to Barry Tarasoff, Cowen’s
Director of Research.

“It is with pleasure that we welcome Edward to Cowen,” commented Barry
Tarasoff. “His addition further enhances Cowen’s growing biotechnology
team and augments our leading healthcare coverage. We look forward to
the valuable contributions he will make to the firm.”

Mr. Nash joins Cowen from ROTH Capital Partners where he was a Senior
Analyst covering biotechnology. While at ROTH, Mr. Nash focused on the
therapeutic areas of HCV, RNAi, vaccines, and drug delivery. Prior to
this, Mr. Nash was a Senior Analyst at Merriman Curhan Ford, Inc. and
held similar roles at Stifel, Nicolaus & Company, Rodman & Renshaw,
Inc., and SG Cowen Asset Management, Inc.

Mr. Nash received his B.S. from Spring Hill College in Biology and
Chemistry and an M.P.H. in Epidemiology from University of Alabama at
Birmingham. He also holds an MBA in Finance and an M.S. in International
Business from University of Miami.

About Cowen Group, Inc.

Cowen Group, Inc. is a leading diversified financial services firm
providing alternative investment management, investment banking,
research, and sales and trading services through its business units,
Ramius and Cowen and Company. Its alternative investment management
products include hedge funds, fund of funds, real estate funds,
healthcare royalty funds, cash management and commodity trading funds,
offered primarily under the Ramius name. Cowen and Company offers
industry focused investment banking for growth-oriented companies,
domain knowledge-driven research and a sales and trading platform for
institutional investors. Founded in 1918, the firm is headquartered in
New York and has offices located in major financial centers around the
world.

SOURCE: Cowen Group, Inc.

Cowen Group, Inc.
Emma Simonich, 646-562-1154
Media Relations
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