SCHEDULE 13G

Amendment No. 0 
Archipelago Holdings Incorporated 
Common Stock 
Cusip #03957A104 




Cusip #03957A104 
Item 1:	Reporting Person: Fidelity Non Profit Management Foundation
Item 4:	Delaware
Item 5:	2,420,640 
Item 6:	0 
Item 7:	2,420,640 
Item 8:	0 
Item 9:	2,420,640 
Item 11:	5.134% 
Item 12:	    CO




	SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS
	FILED PURSUANT TO RULE 13d-1(c) or 13d-2(d)



Item 1(a).	Name of Issuer:	

		Archipelago Holdings Incorporated 

Item 1(b).	Name of Issuer's Principal Executive Offices:

		100 South Wacker Drive
		Suite 1800 
		Chicago, IL  60606
		  

Item 2(a).	Name of Person Filing: 

		Fidelity Non-Profit Management Foundation

Item 2(b).	Address or Principal Business Office or, if None, 
		Residence:

		82 Devonshire Street, F9A
		Boston, Massachusetts  02109

Item 2(c).	Citizenship:

		Not applicable

Item 2(d).	Title of Class of Securities:

		Common Stock 

Item 2(e).	CUSIP Number:  

		03957A104 


Item 3.	This statement is filed pursuant to Rule 13d-1(c) or 13d-2(d). 

Item 4.	Ownership
							             
  (a)	Amount Beneficially Owned:                             2,420,640

  (b)	Percent of Class:                                         5.134%

  (c)	Number of shares as to which such person has:  

  (i)	sole power to vote or to direct the vote:              2,420,640

 (ii)	shared power to vote or to direct the vote:                    0
 
 (iii)	sole power to dispose or to direct the disposition of: 2,420,640

 (iv)	shared power to dispose or to direct the disposition of:       0



Item 5.	Ownership of Five Percent or Less of a Class.

	Not applicable.

Item 6.	Ownership of More than Five Percent on Behalf of Another Person.

	Not applicable.

Item 7.	Identification and Classification of the Subsidiary Which Acquired 
        the Security Being Reported on By the Parent Holding Company.

	Not applicable. 

Item 8.	Identification and Classification of Members of the Group.

	Not Applicable. 

Item 9.	Notice of Dissolution of Group.

	Not applicable.

Item 10.	Certification.

By signing below I certify that, to the best of my knowledge and belief, 
the securities referred to above were not acquired and are not held for 
the purpose of or with the effect of changing or influencing the control 
of the issuer of the securities and were not acquired and are not held in 
connection with or as a participant in any transaction having that purpose 
or effect. 

Signature

After reasonable inquiry and to the best of my knowledge and belief, I 
certify that the information set forth in this statement is true, complete 
and correct.

May 12, 2005 			
Date

 

/s/ Jeffrey P. Resnik
________________________				
Signature
Jeffrey P. Resnik			
Treasurer