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ArcaEx Releases February 2005 Transaction Volume Data

CHICAGO, March 9 /PRNewswire-FirstCall/ -- Archipelago Holdings, Inc. (PCX: AX) today announced its February 2005 market transaction volume data for the Archipelago Exchange (ArcaEx(R)). Specifically, in NYSE- listed equity securities, ArcaEx's total trading market share was 2.3% in February 2005, up from 1.5% in February 2004 and down slightly from 2.4% in January 2005.

In AMEX-listed equity securities, ArcaEx's total trading market share was 24.8% in February 2005, up from 18.2% in February 2004 and down from 25.5% in January 2005. ArcaEx's ETF total monthly share volume showed continued year-over-year growth with 1,411 (millions of shares) having traded in February 2005 compared to 887 (millions of shares) traded in February 2004 and down from 1,632 (millions of shares) in January 2005.


    In Nasdaq-listed equity securities, ArcaEx's total trading market share

was 24.0% in February 2005 down from 25.9% in February 2004 and unchanged from

24.0% in January 2005.



                                          February     January      February

                                            2005         2005         2004

    Total monthly volume of

     Nasdaq-listed equity

     securities (millions

     of shares)                           37,372.3    43,788.7      36,437.4

    ArcaEx monthly volume of

     Nasdaq-listed equity

     securities (millions

     of shares) (1)                        8,986.4    10,520.0       9,452.5

    ArcaEx share of total monthly

     volume of Nasdaq-listed

     equity securities (%)(2)                 24.0%       24.0%         25.9%

    Total monthly volume of

     NYSE-listed equity securities

     (millions of shares)                 37,824.2    40,521.1      36,276.4

    ArcaEx monthly volume of

     NYSE-listed equity securities

     (millions of shares)(1)                 865.9       985.7         542.2

    ArcaEx share of total monthly

     volume of NYSE-listed equity

     securities (%)(2)                         2.3%        2.4%          1.5%

    Total monthly volume of

     AMEX-listed equity securities

     (millions of shares)                  4,570.9     4,944.8       5,837.3

    ArcaEx monthly volume of

     AMEX-listed equity securities

     (millions of shares) (1)              1,135.1     1,260.9       1,059.9

    ArcaEx share of total monthly

     volume of AMEX-listed equity

     securities (%)(2)                        24.8%       25.5%         18.2%

    ArcaEx ETF total monthly share

     volume (millions of shares)           1,411.2     1,632.0         887.6

    ArcaEx monthly customer order

     volume matched internally (%)(3)         88.2%       88.8%         85.7%

    ArcaEx monthly customer order

     volume routed out  (%)(3)                11.8%       11.2%         14.3%

    Number of trading days in period          19          20            19





    ArcaEx Most Active February 2005

                                    Symbol     Share Volume     Market Share

    Nasdaq-100 Index(R)              (QQQQ)     429,060,130         24.1%

    Intel(R)                         (INTC)     399,720,426         28.0%

    Microsoft(R)                     (MSFT)     348,813,184         25.4%

    Cisco Systems(R)                 (CSCO)     294,703,737         22.2%

    Semiconductor Holdrs(sm)          (SMH)     275,670,300         48.2%

    SPDR(R)                           (SPY)     271,094,465         26.3%

    Oracle(R)                        (ORCL)     220,259,917         29.2%

    Applied Materials(R)             (AMAT)     198,351,690         27.1%

    Sun(R) Microsystems              (SUNW)     183,906,210         26.5%

    Sirius Satellite radio           (SIRI)     144,320,524         16.1%

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 Archipelago's Prospectus, dated August 12, 2004.

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 Archipelago's Prospectus, dated August 12, 2004, and form 10-Q dated November 9, 2004, each of which are filed with the Securities and Exchange Commission, and available on Archipelago's website: http://www.archipelago.com.

Archipelago Contacts:
Margaret Nagle - Press
312-442-7083
Patrick Murphy - Investor Relations
312-442-7005

SOURCE Archipelago Holdings, Inc.
03/09/2005
CONTACT: Press, Margaret Nagle, +1-312-442-7083, or Investors, Patrick
Murphy, +1-312-442-7005, both of Archipelago Holdings
Web site: http://www.archipelago.com
http://www.arca-vision.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.
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