Lava Trading Connects to ISE Stock Exchange.

NEW YORK -- The International Securities Exchange (NYSE: ISE) today announced that Lava Trading Inc. has added the ISE Stock Exchange as an equity execution destination. Lava joins other trading solutions providers connected to the ISE Stock Exchange, including InstaQuote, MIXIT, Neovest, Portware, Orc Software, and Order Execution Services.

Andrew Brenner, head of the ISE Stock Exchange, noted, "We are very pleased to add Lava to the growing list of trading solutions providers connected to the ISE Stock Exchange. Through the ISE Stock Exchange's unique dual platform, orders routed through Lava will have access to both our displayed and non-displayed pools of liquidity to maximize execution quality."

The ISE Stock Exchange is an all-electronic, Regulation NMS compliant trading system. ISE's equity trading platform integrates a fully-displayed stock market with its innovative MidPoint Match(TM) offering for trading equities anonymously at the midpoint price of the National Best Bid and Offer (NBBO).

Lava is a cost-effective, neutral provider of high-performance OTC, Listed and Foreign Exchange trading solutions for the financial services industry. Its products, created as true ASP solutions, are used by leading broker/dealers, including most of the top 20 U.S. investment banks, market makers, hedge funds and institutional investors.

"We are pleased to team with the ISE Stock Exchange and to offer our equities clients an additional execution destination," said Jim Weber, Managing Director, Lava Trading. "This is in keeping with our commitment to provide optimal market access and help our clients achieve best execution."

ISE Background

International Securities Exchange Holdings, Inc. (NYSE: ISE), through its subsidiaries, operates a family of innovative securities markets. ISE is founded on the principle that technology and competition create better, more efficient markets for investors and consists of an options exchange, a stock exchange and an alternative markets platform. ISE continually enhances its trading systems and develops new products to provide investors with the best marketplace and investment tools to trade smarter.

ISE developed a unique market structure for advanced screen-based trading systems and in May 2000 launched the first fully-electronic US options exchange. Currently, ISE operates the largest U.S. equity options exchange and is among the leading options exchanges in the world. ISE offers index options, including a portfolio of proprietary index products, and enhanced market data products for sophisticated investors. ISE FX Options(TM) are slated to launch in 2007.

ISE Stock Exchange, launched in September 2006 with strategic partners, includes an innovative MidPoint Match(TM) platform which offers investors continuous price improvement. MidPoint Match was integrated with a fully-displayed Best Bid Offer market in the fourth quarter of 2006.

ISE's alternative markets business currently consists of an events market trading platform known as Longitude. Longitude's patented and proprietary technology provides a unique parimutuel structure for derivatives auctions which results in greater trading and pricing flexibility for market participants.

For more information about ISE and its options exchange, visit www.iseoptions.com and for more information about ISE Stock Exchange, visit www.isestock.com. Additionally, to learn more about ISE alternative markets technology, visit www.longitude.com.

About Lava Trading Inc.

Headquartered in New York City, with locations in California, Connecticut and the United Kingdom, Lava Trading Inc. is an innovative technology firm that develops high-performance trading solutions for the financial services industry. Lava products are created as true ASP solutions built to withstand maximum volumes in the most volatile conditions. As a cost effective and neutral provider, Lava's OTC, Listed and Foreign Exchange solutions are used by leading broker/dealers, including most of the top U.S. investment banks, as well as market makers, hedge funds and institutional investors. With its patented technology and capital markets expertise, Lava creates value-added trading solutions that combine speed, intelligence and reliability. Lava is a wholly owned, independently-operated subsidiary of Citigroup, Inc. (NYSE: C) and member NASD/SIPC. For more information, visit www.lavatrading.com.

Forward Looking Statements

Certain matters discussed in this press release are "forward looking statements" intended to qualify for the safe harbor from liability established by the Private Securities Litigation Reform Act of 1995. These statements relate to future events or our future financial performance, and involve known and unknown risks, uncertainties and other factors that may cause our actual results, levels of activity, performance or achievements, to be materially different from those contemplated by the forward looking statements. We undertake no ongoing obligation, other than that imposed by law, to update these statements. Factors that could affect our results, levels of activity, performance or achievements and cause them to materially differ from those contained in the forward looking statements can be found in our filings with the Securities and Exchange Commission, including our annual report on Form 10-K, current reports on Form 8-K and quarterly reports on Form 10-Q, as amended.