Exhibit 99.1

GFI Group Announces Termination of Talks with Tullett Prebon

New York,  September 9, 2008 – GFI Group Inc. (Nasdaq: GFIG), an inter-dealer brokerage, market data, trading platform and analytical software provider for global cash and derivative markets, announced today that it has terminated its discussions with Tullett Prebon plc regarding a possible business combination because the two companies failed to reach acceptable economic terms for a transaction.

GFI noted that it will continue to pursue its strategy of technology enabled brokerage and other services in OTC derivative and cash markets and to focus on delivering value to its shareholders.

About GFI Group Inc.

GFI Group Inc. (http://www.GFIgroup.com) is a leading inter-dealer broker specializing in over-the-counter derivatives products and related securities. GFI Group Inc. provides brokerage services, market data, trading platform and analytics software products to institutional clients in markets for a range of credit, financial, equity and commodity instruments.

Headquartered in New York, GFI was founded in 1987 and employs more than 1,700 people with additional offices in London, Paris, Hong Kong, Seoul, Tokyo, Singapore, Sydney, Cape Town, Dubai, Tel Aviv, Calgary, Englewood (NJ) and Sugar Land (TX).  GFI provides services and products to over 2,200 institutional clients, including leading investment and commercial banks, corporations, insurance companies and hedge funds. Its brands include GFI™, GFInet®, CreditMatch®, GFI ForexMatch™, EnergyMatch®, FENICS®, Starsupply®, Amerex®, and Trayport®.

Forward-looking statements

Certain matters discussed in this press release contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. When used in this press release, the words “anticipate,” “believe,” “estimate,” “may,” “might,” “intend,” “expect” and similar expressions identify such forward-looking statements. Actual results, performance or achievements could differ materially from those contemplated, expressed or implied by the forward-looking statements contained herein. These forward-looking statements are based largely on the expectations of the Company and are subject to a number of risks and uncertainties. These include, but are not limited to, risks and uncertainties associated with: acquisitions by us of businesses or technologies; economic, political and market factors affecting trading volumes, securities prices or demand for the Company’s brokerage services; competition from current and new competitors; the Company’s ability to attract and retain key personnel, including highly-qualified brokerage personnel; the Company’s ability to identify and develop new products and markets; changes in laws and regulations governing the Company’s business and operations or permissible activities; the Company’s ability to manage its international operations; financial difficulties experienced by the Company’s customers or key participants in the markets in which the Company focuses its brokerage services; the Company’s ability to keep up with technological changes; and uncertainties relating to

litigation.  Further information about factors that could affect the Company’s financial and other results is included in the Company’s filings with the Securities and Exchange Commission.  The Company does not undertake to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Investor Relations Contact:
GFI Group Inc.	Comm-Partners LLC
Christopher Giancarlo	June Filingeri
Executive Vice President - Corporate Development	203-972-0186
212-968-2992	junefil@optonline.net
investorinfo@gfigroup.com
Chris Ann Casaburri
Investor Relations Manager
212-968-4167
chris.casaburri@gfigroup.com
Media Contact:
GFI Group Inc.
Alan Bright
Public Relations Manager
011-44-20-7877-8049
alan.bright@gfigroup.co.uk