Ownership Submission
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 *
NATIONAL ASSOCIATION OF SECURITIES DEALERS INC
   2. Issuer Name and Ticker or Trading Symbol
NASDAQ STOCK MARKET INC [NDAQ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
1735 K. STREET, N.W.		 3. Date of Earliest Transaction (Month/Day/Year)
04/21/2006
(Street)

WASHINGTON, DC 20006		 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, par value $0.01 per share 04/21/2006   S   12,400 D $ 16 10,476,242 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

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
NATIONAL ASSOCIATION OF SECURITIES DEALERS INC
1735 K. STREET, N.W.
WASHINGTON, DC 20006		     X    

Signatures

 /s/ Scott C. Anderson, Vice President, Finance   04/24/2006
**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).
 
Remarks:
As of the date of this filing, National Association of Securities Dealers, Inc. ("NASD") had issued and outstanding 10,476,242 warrants ("Warrants"), each exercisable for one share of The Nasdaq Stock Market, Inc.'s ("Nasdaq") common stock, par value $0.01 per share (the "Common Stock"), held by NASD is each of four approximately one year consecutive exercise periods (the first, second and the third of which expired at the close of business on June 27, 2003, June 25, 2004 and June 27, 2005, respectively, and the fourth of which expires on June 27, 2006).  Until Nasdaq is operating as an exchange, the shares of Common Stock underlying the Warrants are subject to a voting trust agreement (the "Voting Trust") whereby a voting trustee will vote all shares of Common Stock underlying unexpired and unexercised Warrants, as directed by NASD.  In addition, until the earlier to occur of the time Nasdaq satisfies conditions established by the Securities and Exchange Commission to operate as an exchange or the effectiveness of a registration statement filed by Nasdaq with the Securities and Exchange Commission with respect to the shares of Common Stock sold upon exercise of Warrants, the voting trustee will vote all such shares of Common Stock sold upon the exercise of Warrants, as directed by NASD (although NASD no longer has an economic interest in such shares).  This Form 4 reflects the exercise of Warrants for the purchase of a total of 12,400 shares of Common Stock and the sale by NASD of such shares.  As of the date hereof, NASD owns 10,476,242 shares of Common Stock underlying unexercised Warrants and thus subject to the Voting Trust.

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