CHICAGO, Jan. 23 /PRNewswire/ -- The Archipelago Exchange(R) (ArcaEx(R)), the nation's first totally open, all-electronic stock exchange, today announced that the ArcaEx Tech 100 Index(R) will replace three constituents in the index as a result of recent mergers and acquisitions. The changes are effective as of index open on January 30, 2006.

Leaving the index as a result of recent corporate actions: Chiron Corporation (Nasdaq: CHIR); Scientific-Atlanta, Inc. (NYSE: SFA) and Siebel Systems, Inc. (Nasdaq: SEBL).

New constituents to the Index: Hyperion Solutions Corporation (Nasdaq: HYSL); Jabil Circuit, Inc. (NYSE: JBL) and Novartis AG (NYSE: NVS).

About The ArcaEx Tech 100 Index(R)

The ArcaEx Tech 100 Index(R), formerly the PSE Tech 100 Index, has been in existence since 1982, and is commonly referenced as a benchmark for the U.S. tech sector. This price weighted index is comprised of 100 listed and over-the-counter securities. Companies from different industries that produce or deploy innovative technologies to conduct their business are considered for inclusion. Leading companies are selected from several industries, including computer hardware, software, semiconductors, telecommunications, data storage and processing, electronics and biotechnology. Modeled as a multi-industry technology index, the objective of the ArcaEx Tech 100 Index is to provide a benchmark for measuring the performance of companies using technology innovation across a broad spectrum of industries.

More information about the index can be found: http://www.archipelago.com/marketdata/market_arcatech100.asp

About ArcaEx

Archipelago Holdings (PCX: AX) operates the Archipelago Exchange(R) (ArcaEx(R)) the first totally open all-electronic stock exchange in the United States. ArcaEx trades all Nasdaq-listed equity securities and exchange listed equity securities, including those listed on the New York Stock Exchange(R), American Stock Exchange(R), and ArcaEx(R). In addition to offering core execution services, ArcaEx provides corporate clients with listing services and innovative data products. In September 2005, Archipelago acquired PCX Holdings, Inc., parent company of the Pacific Exchange and PCX Equities, Inc. allowing Archipelago to bring together the all-electronic trading of equity securities and options products thereby expanding and diversifying Archipelago's business lines. For more information please visit http://www.archipelago.com.

SOURCE The Archipelago Exchange

CONTACT:
Todd Swearingen of The Archipelago Exchange, +1-312-442-7747
Web site: http://www.archipelago.com
http://www.archipelago.com/marketdata/market_arcatech100.asp