Mondo Visione Worldwide Financial Markets Intelligence

FTSE Mondo Visione Exchanges Index:

Archipelago Holdings Releases October 2005 Transaction Volume Data

Date 10/11/2005

Archipelago Holdings, Inc. (PCX: AX) today announced its October 2005 market transaction volume data for the Archipelago Exchange (ArcaEx®) and the Pacific Exchange (PCX). Specifically, in NYSE- listed equity securities, ArcaEx's total trading market share was 4.8% in October 2005, up from 2.3% in October 2004 and up from 3.9% in September 2005.

In AMEX-listed equity securities, ArcaEx's total trading market share was 34.5% in October 2005, up from 27.0% in October 2004 and up from 30.7% in September 2005. ArcaEx's ETF total monthly share volume showed continued year-over-year growth with 3,208.7 (millions of shares) having traded in October 2005 compared to 1,659.0 (millions of shares) traded in October 2004 and up from 2,182.9 (millions of shares) in September 2005.

In Nasdaq-listed equity securities, ArcaEx's total trading market share was 23.7% in October 2005 down from 25.1% in October 2004 and up from 22.0% in September 2005.

In equity option contracts, the PCX's total trading market share was 7.9% in October 2005 down from 8.7% in October 2004 and down from 10.7% in September 2005.

ArcaEx Transaction Volume Data

                                             October   September   October
                                              2005       2005       2004
                                            --------   --------   --------
Total monthly volume of Nasdaq-listed
 equity securities (millions of shares)     37,905.3   36,311.6   36,697.4
ArcaEx monthly volume of Nasdaq-listed
 equity securities (millions of shares) (1)  8,983.3    7,986.6    9,198.3
ArcaEx share of total monthly volume of
 Nasdaq-listed  equity securities (%)(2)        23.7%      22.0%      25.1%
Total  monthly volume of NYSE-listed
 equity securities (millions of shares)     51,485.8   46,368.2   40,286.5
ArcaEx monthly volume of NYSE-listed
 equity securities (millions of shares)(1)   2,463.2    1,787.6      933.5
ArcaEx share of total monthly volume of
 NYSE-listed  equity securities (%)(2)           4.8%       3.9%       2.3%
Total  monthly volume of AMEX-listed
 equity securities (millions of shares)      8,094.5    6,434.6    6,629.2
ArcaEx monthly volume of AMEX-listed
 equity securities (millions of shares) (1)  2,795.0    1,972.3    1,790.7
ArcaEx share of total monthly volume of
 AMEX-listed equity securities (%)(2)           34.5%      30.7%      27.0%
ArcaEx ETF total monthly share volume
 (millions of shares)(1)                     3,208.7    2,182.9    1,659.0
ArcaEx monthly customer order volume
 matched internally (%)(3)                      89.8%      88.8%      87.0%
ArcaEx monthly customer order volume
 routed out (%)(3)                              10.2%      11.2%      13.0%
Number of trading days in period                  21         21         21



                     ArcaEx Most Active October 2005

               Symbol                   Share Volume    Market Share
                                        ------------    ------------
Nasdaq-100 Index®            (QQQQ)      661,667,563           29.0%
SPDR®                        (SPY)       611,723,671           34.1%
iShares® MSCI Japan Index    (EWJ)       322,004,023           52.4%
iShares® Russell 2000 Index  (IWM)       312,175,426           39.6%
Energy Select Sector SPDR    (XLE)       296,761,750           49.6%
Microsoft®                   (MSFT)      275,562,281           19.1%
Intel®                       (INTC)      249,137,580           21.3%
ML Semiconductor HLDR        (SMH)       200,245,500           42.9%
Apple Computer               (AAPL)      182,442,158           27.3%
Cisco® Systems               (CSCO)      180,148,976           17.0%



PCX Equity Option Transaction Volume Data

                                            October    September   October
                                            --------   --------   --------
Total consolidated monthly equity option
 contract volume (millions of contracts)       140.2      120.1       99.1
PCX monthly equity option contract volume
 (millions of contracts) (4)                    11.1       12.8        8.6
PCX share of total monthly equity option
 contract volume (%) (4)                         7.9%      10.7%       8.7%

Additional information on ArcaEx daily, weekly and monthly trading transaction volumes is publicly available in real time through the ArcaVision website accessible via www.archipelago.com. Additional data and enhanced functionality can be obtained through a free subscription to ArcaVision. Investors and ArcaEx clients can subscribe to ArcaVision at www.arca-vision.com.

(1) For purposes of calculating monthly transaction volume on ArcaEx, we include all shares that are “handled” on ArcaEx for the month. Handled shares include both shares that are bought and sold during the month within our internal liquidity pool and shares that are routed to external market centers for execution.

(2) ArcaEx monthly market share is calculated based on the number of shares handled on the ArcaEx system during the month as a percentage of total monthly volume. Total monthly volume is based on the number of shares of equity securities traded during the month on Nasdaq, AMEX or the NYSE, including, if applicable, exchange-traded funds, as reported in the consolidated tape. The “consolidated tape” provides last sale price and volume of equity securities transactions to the public.

(3)In computing the percentage of monthly client order volume matched internally and the monthly percentage of customer order volume routed out, we calculate the percentage based on the volume of individual customer orders, not the volume of matched trades (i.e., only counting one side of a matched transaction). For example, we calculate two customer orders matched internally on our system as two customer orders matched internally, and we include the volume of both the buy order and the sell order in computing our percentages of monthly customer order volume matched internally and routed out. We calculate one customer order routed to an external market center (which will be matched with an order at that other market center) as one outbound trade or one customer order. We calculate one customer order routed to us from an external market center and matched with an order on our system as one inbound trade or one customer order.

(4) Archipelago Holdings completed its acquisition of PCX Holdings, Inc., the parent company of the PCX, on September 26, 2005. Option volume is reported by the Options Clearing Corporation (OCC).

About Archipelago Holdings

Archipelago Holdings (PCX: AX) operates The Archipelago Exchange® (ArcaEx®) 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®, American Stock Exchange®, and ArcaEx®. In addition to offering core execution services, ArcaEx provides corporate clients with listing services and innovative data products. In 2004, Archipelago launched ArcaVision to provide corporate and trading clients with more transparent market data, analytical tools and access to market-wide and ArcaEx specific trading information. Archipelago Holdings completed its initial public offering in August 2004. For more information please visit www.archipelago.com.

ArcaEx's, past transaction performance is not necessarily indicative of its future results. Periodically, ArcaEX's transaction performance will experience fluctuations due to unforeseen factors effecting trading activity, including seasonality, general economic, political and market conditions, unforeseen market closures or other disruptions in trading. A description of the factors that may influence ArcaEx's volume of securities transactions are 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.

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.