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Archipelago Holdings, Inc. To Release Fourth Quarter And 2005 Year End Results On January 31

Date 12/01/2006

Archipelago Holdings, Inc. (PCX: AX), owner and operator of the Archipelago Exchange(SM) (ArcaEx(R)), will release its results for the fourth quarter of 2005 on Tuesday, January 31, 2006 at 4:00 p.m. ET and will hold a conference call at approximately 4:30 p.m. ET to review the results with the investment community.

The call will be webcast live from Archipelago's Investor Relations webpage available at http://www.archipelago.com and will be accessible by telephone at the following numbers:

Calling from the USA or Canada: 866.831.6247

Calling from other countries: 617.213.8856

Conference ID: 32644815

A replay of the call will be available in the Investors Relations section at http://www.archipelago.com on January 31, 2006. Visitors to http://www.archipelago.com will be able to listen to an archived copy of the conference call webcast for one month following the call.

About Archipelago

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 .

"Safe Harbor" Statement under the Private Securities Litigation Reform Act of 1995: Statements in this press release regarding Archipelago Holdings, Inc.'s business which are not historical facts are "forward-looking statements" that involve risks and uncertainties. For a discussion of such risks and uncertainties, which could cause actual results to differ from those contained in the forward-looking statements, see "Risk Factors" in the Company's Annual Report or Form 10-K for the most recently ended fiscal year.