FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Chai Nelson   2. Issuer Name and Ticker or Trading Symbol ARCHIPELAGO HOLDINGS INC [AX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) NA (Last) (First) (Middle) 100 SOUTH WACKER DRIVE, SUITE 1800, C/O ARCHIPELAGO HOLDINGS, INC. 3. Date of Earliest Transaction (Month/Day/Year) 03/07/2006 (Street) CHICAGO, IL 60606 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 03/07/2006   D   32,035 D (1) 0 D

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Employee Stock Options (right to buy)

$ 19.3

03/07/2006

D

25,648

(2)(3)

03/16/2015

Common Stock

25,648

(2)

0

D

Employee Stock Options (right to buy)

$ 11.5

03/07/2006

D

70,000

(2)(4)

08/11/2014

Common Stock

70,000

(2)

0

D

Employee Stock Options (right to buy)

$ 20.25

03/07/2006

D

72,222

(2)(5)

08/22/2010

Common Stock

72,222

(2)

0

D

Employee Stock Options (right to buy)

$ 4.91

03/07/2006

D

22,222

(2)(5)

08/11/2013

Common Stock

22,222

(2)

0

D

Employee Stock Options (right to buy)

$ 6.26

03/07/2006

D

22,222

(2)(5)

08/11/2013

Common Stock

22,222

(2)

0

D

Employee Stock Options (right to buy)

$ 13.41

03/07/2006

D

77,778

(2)(6)

11/18/2013

Comon Stock

77,778

(2)

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Chai Nelson 100 SOUTH WACKER DRIVE, SUITE 1800 C/O ARCHIPELAGO HOLDINGS, INC. CHICAGO, IL 60606			NA

Signatures

by Cynthia A. Lance under power of attorney for Nelson J. Chai		03/08/2006
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Disposed of pursuant to the Issuer's merger with the New York Stock Exchange, Inc. in exchange for an equal number of shares of common stock of NYSE Group, Inc., par value $0.01 per share. On the effective date of the merger, the closing price of the Issuer's common stock was $64.25 per share. The shares of the NYSE Group, Inc. common stock commenced trading on March 8, 2006, the day following the effective date of the merger, at $67.00 per share.
(2)	Converted in the merger into an equivalent option to acquire an equal number of shares of common stock of NYSE Group, Inc., par value $0.01 per share at the same exercise price.
(3)	These options were scheduled to vest in four equal annual installments over a four year period from the date of grant, March 16, 2005. Immediately prior to the closing of the merger, 75% of the unvested portion of this award accelerated vesting.
(4)	These options were scheduled to vest in four equal annual installments over a four year period from the date of grant, August 11, 2004. Immediately prior to the closing of the merger, 75% of the unvested portion of this award accelerated vesting.
(5)	These options were fully vested.
(6)	These options were scheduled to vest in four equal annual installments over a four year period from the date of grant, November 18, 2003. Immediately prior to the closing of the merger, 75% of the unvested portion of this award accelerated vesting.

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