Singer Karen – ‘SC 13G’ on 6/28/04 re: Ibasis Inc

On:  Monday, 6/28/04, at 3:52pm ET   ·   Accession #:  950123-4-7893   ·   File #:  5-57187

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Statement of Beneficial Ownership   —   Schedule 13G
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: SC 13G      Statement of Beneficial Ownership                      5     17K 

Document Table of Contents

SC 13G
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SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

SCHEDULE 13G
(RULE 13d-102)

 INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
TO RULES 13d-1(b) (c) AND (d) AND AMENDMENTS THERETO FILED
PURSUANT TO RULE 13d-2(b)*

iBasis, Inc.
------------------------------------------------------------------------------- 
(Name of Issuer)

Common Stock, $0.001 Par Value
------------------------------------------------------------------------------- 
(Title of Class of Securities)

 450732102
------------------------------------------------------------------------------- 
(CUSIP Number)

 June 18, 2004
------------------------------------------------------------------------------- 
 (Date of Event which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant
to which this Schedule is filed:
 [ ] Rule 13d-1(b)
 [X] Rule 13d-1(c)
 [ ] Rule 13d-1(d)

 Page 1 of 5

--------                                                                        

*    The remainder of this cover page shall be filled out for a reporting       
   person's initial filing on this form with respect to the subject class of
   securities, and for any subsequent amendment containing information which
would alter disclosures provided in a prior cover page.               

   The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange   
Act of 1934 or otherwise subject to the liabilities of that section of the Act  
but shall be subject to all other provisions of the Act (however, see the       
Notes).                                                                         

SC 13G
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SCHEDULE 13G

------------------------------------------------------------------------------- 
CUSIP NO. 450732102                                                 Page 2 of 5 
------------------------------------------------------------------------------- 
1    NAME OF REPORTING PERSON                                                   
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                     
    --------------------------------------------------------------------------
Karen Singer                                                          
------------------------------------------------------------------------------- 
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*            (a) [ ]       

                                                           (b) [ ]
------------------------------------------------------------------------------- 
3    SEC USE ONLY                                                               

------------------------------------------------------------------------------- 
4    CITIZENSHIP OR PLACE OF ORGANIZATION                                       

United States                                                         
------------------------------------------------------------------------------- 
5    SOLE VOTING POWER                          
NUMBER OF                                                                   
SHARES            4,904,605                                               
BENEFICIALLY    --------------------------------------------------------------- 
OWNED BY      6    SHARED VOTING POWER                                      
EACH                                                                    
REPORTING          0                                                        
  PERSON       ---------------------------------------------------------------
WITH        7    SOLE DISPOSITIVE POWER                                 

4,904,605                             
               ---------------------------------------------------------------
8    SHARED DISPOSITIVE POWER                   

0                                     
------------------------------------------------------------------------------- 
9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON               

4,904,605                                                             
------------------------------------------------------------------------------- 
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES   [ ]   
------------------------------------------------------------------------------- 
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                            

9.76%                                                                 
------------------------------------------------------------------------------- 

12   TYPE OF REPORTING PERSON                                                   

IN                                                                    
------------------------------------------------------------------------------- 

 *SEE INSTRUCTIONS BEFORE FILLING OUT!

SC 13G
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Item 1(a).   Name of Issuer:                     iBasis, Inc.                   

Item 1(b).   Address of Issuers's                20 Second Avenue               
  Principal Executive Offices:        Burlington, MA 01803

Item 2(a).   Name of Person Filing:              Karen Singer                   

Item 2(b).   Address of Principal                Karen Singer                   
Business Office or,                 113 Jackson Drive 
 if None, Residence:                 Cresskill, NJ 07626

Item 2(c).   Citizenship:                        United States                  

Item 2(d).   Title of Class of Securities:       Common Stock, $0.001 par value 

Item 2(e).   CUSIP Number:                       450732102                      

Item 3.  IF THIS STATEMENT IS FILED PURSUANT TO RULE 13d-1(b) OR 13d-2(b) or    
(c), CHECK WHETHER THE PERSON FILING IS A:                    

    Not Applicable, this statement is filed pursuant to Rule 13d-1(c).

Item 4.  OWNERSHIP: The reporting person has sole dispositive and voting power  
        with respect to 4,904,605 of the reported securities as the trustee of
       the Singer Children's Management Trust which owns all of the reported
securities.                                                   

(a)   4,904,605                                               

(b)   9.76%                                                   

(c)   (i)   sole voting power:           4,904,605            
(ii)  shared voting power:         0              

(iii) sole dispositive power:      4,904,605      

(iv)  shared dispositive power:    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.                                               

SC 13G
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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.                                               

SC 13G
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                                                                   Page 5 of 5

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.                                                                        

Dated: June 28, 2004                                                            
                                      /s/ Karen Singer
                                         -----------------------
                                          Karen Singer

Dates Referenced Herein   and   Documents Incorporated by Reference

				Referenced-On Page
This ‘SC 13G’ Filing		Date		First		Last			Other Filings
Filed on:		6/28/04		5
		6/18/04		1					DEF 14A,  SC TO-I/A
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