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Archipelago Holdings Releases July 2005 Transaction Volume Data

Date 09/08/2005

Archipelago Holdings, Inc. (PCX: AX) today announced its July 2005 market transaction volume data for the Archipelago Exchange (ArcaEx(R)), a facility of the Pacific Exchange. Specifically, in NYSE-listed equity securities, ArcaEx's total trading market share was 3.5% in July 2005, up from 1.6% in July 2004 and up from 3.3% in June 2005.

In AMEX-listed equity securities, ArcaEx's total trading market share was 30.5% in July 2005, up from 25.5% in July 2004 and up from 29.1% in June 2005. ArcaEx's ETF total monthly share volume showed continued year-over-year growth with 1,933.5 (millions of shares) having traded in July 2005 compared to 1,424.7 (millions of shares) traded in July 2004 and down slightly from 1,993.7 (millions of shares) in June 2005.

In Nasdaq-listed equity securities, ArcaEx's total trading market share was 24.1% in July 2005 down from 27.2% in July 2004 and up from 22.7% in June 2005.

    ArcaEx Transaction Volume Data
                                                  July      June      July
                                                  2005      2005      2004
    Total monthly volume of Nasdaq-listed
     equity securities (millions of shares)     33,681.1  39,286.3   36,430.3
    ArcaEx monthly volume of Nasdaq-listed
     equity securities (millions of shares)(1)   8,124.6   8,900.9    9,893.4
    ArcaEx share of total monthly volume of
     Nasdaq-listed equity securities (%)(2)         24.1%     22.7%      27.2%
    Total monthly volume of NYSE-listed
     equity securities (millions of shares)     38,542.5  42,587.5   36,168.0
    ArcaEx monthly volume of NYSE-listed
     equity securities (millions of shares)(1)   1,340.1   1,397.5      570.7
    ArcaEx share of total monthly volume of
     NYSE-listed equity securities (%)(2)            3.5%      3.3%       1.6%
    Total monthly volume of AMEX-listed
     equity securities (millions of shares)      5,353.8   5,540.7    5,934.7
    ArcaEx monthly volume of AMEX-listed
     equity securities (millions of shares)(1)   1,635.3   1,614.0    1,515.5
    ArcaEx share of total monthly volume of
     AMEX-listed equity securities (%)(2)           30.5%     29.1%      25.5%
    ArcaEx ETF total monthly share volume
     (millions of shares)(1)                     1,933.5   1,993.7    1,424.7
    ArcaEx monthly customer order volume
     matched internally (%)(3)                      88.8%     89.0%      87.1%
    ArcaEx monthly customer order volume
     routed out  (%)(3)                             11.2%     11.0%      12.9%
    Number of trading days in period                  20        22         21


                                  ArcaEx Most Active July 2005

                                 Symbol    Share Volume      Market Share
    Nasdaq-100 Index(R)          (QQQQ)     476,083,726         29.1%
    SPDR(R)                       (SPY)     338,121,369         28.5%
    Microsoft(R)                 (MSFT)     303,309,341         22.7%
    Intel(R)                     (INTC)     245,289,384         22.8%
    Semiconductor Holdrs(sm)      (SMH)     214,214,800         52.3%
    iShares Russell 2000 Index    (IWM)     206,296,294         42.9%
    Cisco Systems(R)             (CSCO)     191,683,423         21.0%
    Oracle(R)                    (ORCL)     161,050,702         22.5%
    Energy Select SPDR            (XLE)     135,886,690         47.4%
    Sun(R) Microsystems          (SUNW)     131,514,472         16.8%

Additional information on ArcaEx daily, weekly and monthly trading transaction volumes is publicly available in real time through the ArcaVision website accessible via http://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 http://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.

    About Archipelago Holdings

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 Pacific Exchange(R). 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 http://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.