Archipelago Holdings, Inc. To Release 2005 Third Quarter Results On October 24

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.