CHICAGO, Oct. 5 /PRNewswire-FirstCall/ -- Archipelago Holdings, Inc. (PCX: AX - News), owner and operator of the Archipelago Exchange(SM) (ArcaEx®), will release its results for the third quarter of 2005 on Monday, October 24, 2005 at 4:00 p.m. ET and will hold a conference call at approximately 5:00 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: 866-578-5788

     Calling from other countries: 617-213-8057

     Passcode:  64881520

A replay of the call will be available in the Investors Relations section at http://www.archipelago.com on October 25, 2005. 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, Inc. (PCX: AX - News) owns and operates the Archipelago Exchange (ArcaEx). ArcaEx is the first totally open all-electronic stock market in the United States. Through ArcaEx, Archipelago customers can trade over 8,000 equity securities, including securities listed on the New York Stock Exchange®, Nasdaq®, American Stock Exchange® and ArcaEx®. The Archipelago ECN, a precursor to ArcaEx, was one of the four original ECNs, formed in December 1996 with Townsend Analytics.

Forward-Looking Statements

Certain statements in this press release may contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These statements are based on Archipelago's current expectations and involve risks and uncertainties that could cause Archipelago's actual results to differ materially from those set forth in the statements. There can be no assurance that such expectations will prove to be correct. Factors that could cause Archipelago's results to differ materially from current expectations include: general economic and business conditions, industry trends, competitive conditions, regulatory developments as well as other risks or factors identified in the Company's filings with the Securities Exchange Commission, including its Report on Form 10-K for the fiscal year ending December 31, 2004 which is available on the Company's website at http://www.archipelago.com . You should not place undue reliance on forward- looking statements, which speak only as of the date of this press release. Except for any obligation to disclose material information under the Federal securities laws, Archipelago undertakes no obligation to release publicly any revisions to any forward-looking statements to reflect events or circumstances after the date of this press release.

SOURCE Archipelago Holdings, Inc.

CONTACT:
Margaret Nagle of Archipelago Holdings, Inc., +1-312-442-7083
Web site: http://www.archipelago.com
http://www.arcaex.com
http://www.pacificex.com
(AX)