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Cowen Group, Inc. Announces First Quarter 2011Earnings Conference Call

NEW YORK, Apr 29, 2011 (BUSINESS WIRE) —

Cowen Group, Inc. (NASDAQ: COWN) will host a conference call on May 6,
2011 at 9:00 AM Eastern Time to discuss the Company’s financial results
for the first quarter of 2011.

Investors can participate in the conference call by dialing
1-800-920-8624 domestic or 1-617-597-5430 international. The passcode
for the call is 84433766.

For your convenience, the conference call can be replayed in its
entirety beginning at 12:00 PM Eastern Time on May 6, 2011 through May
13, 2011. If you wish to listen to the replay of this conference call,
please dial 1-888-286-8010 domestic or 1-617-801-6888 international and
enter passcode 46304675.

The conference call will also be broadcast live through a link on the
Investor Relations page on the Cowen Web site at
Please go to the Web site at least 15 minutes prior to the call to
register, download and install any necessary audio software. A replay of
the broadcast will be available on the Investor Relations page of the
Cowen Web site.

About Cowen Group, Inc.

Cowen Group, Inc. is a diversified financial services firm and, together
with its consolidated subsidiaries, provides alternative investment
management, investment banking, research, and sales and trading services
through its two business segments: Ramius and its affiliates makes up
the Company’s alternative investment management segment, while Cowen and
Company is its broker-dealer segment. Its alternative investment
management products and services include hedge funds, replication
products, mutual funds, managed futures funds, fund of funds, real
estate, health care royalty funds, and cash management services. 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.
Peter Poillon
Director Investor Relations and Corporate Communications