UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549

                                   SCHEDULE 13G

                    Under the Securities Exchange Act of 1934


InterXion Holding N.V.
                                 (Name of Issuer)

Common Stock
                        (Title and Class of Securities)

                                    N47279109
                                 (CUSIP Number)

                                December 31, 2017
               (Date of Event which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this 
Schedule is filed:

     [X]  Rule 13d-1(b)

     [_]  Rule 13d-1(c)

     [_]  Rule 13d-1(d)

*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 ("Act") 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).


















CUSIP No.                        N47279109                            Page 2

1    NAMES OF REPORTING PERSONS
     
          Principal Real Estate Investors, LLC

2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)

          (a)
          (b)

3    SEC USE ONLY

4    CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware


NUMBER OF           5    SOLE VOTING POWER                 0
SHARES
BENEFICIALLY        6    SHARED VOTING POWER               3,874,188
OWNED BY
EACH                7    SOLE DISPOSITIVE POWER            0
REPORTING
PERSON WITH         8    SHARED DISPOSITIVE POWER          3,874,188


9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          3,874,188

10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
     SHARES (See Instructions)

11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

          5.4

12   TYPE OF REPORTING PERSON (See Instructions)

          IA
















CUSIP No.                        N47279109                            Page 3

Item 1(a).  Name of Issuer:

     InterXion Holding N.V.


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

TUPOLEVLAAN 24
1119 NX
Schiphol-Rijk, NETHERLANDS 00000

Item 2(a).  Name of Person Filing:

     Principal Real Estate Investors, LLC
     

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

     801 Grand Avenue
     Des Moines, IA  50392

     

Item 2(c).  Citizenship:

     Principal Real Estate Investors, LLC - State of Delaware
     

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

     Common Stock

Item 2(e).  CUSIP Numbers:

     N47279109

Item 3.  If this statement is filed pursuant to section 240.13d-1(b) or 240.13d
         2(b) or (c), check whether the person filing is a:

     (e) [X] An investment adviser in accordance with section 240.13d
          1(b)(1)(ii)(E)
     

Item 4.  Ownership:

     (a) Amount Beneficially Owned

3,874,188 Shares Common Stock presently held by Principal 
Real Estate Investors, LLC 





CUSIP No.                        N47279109                            Page 4

     (b) Percent of Class

          5.4 Principal Real Estate Investors, LLC
          
     (c) Number of shares as to which the person has:

          (i) Sole Power to Vote or Direct the Vote

               0 Shares Common Stock Principal Global Investors, LLC
               

          (ii) Shared Power to Vote or Direct the Vote

3,874,188 Shares Common Stock presently held by Principal 
Real Estate Investors, LLC 

          (iii) Sole Power to Dispose or to Direct the Disposition of

               0 Shares Common Stock Principal Global Investors, LLC
               

          (iv) Shared Power to Dispose or to Direct the Disposition of

3,874,188 Shares Common Stock presently held by Principal 
Real Estate Investors, LLC  


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

     []

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

     Persons other than the reporting persons have a right to receive or the
     power to direct the receipt of dividends from or the proceeds from the sale
     of such securities. The interest of no such person having such an interest
     relates to more than five percent of the class.

Item 7.  See Exhibit attached
















CUSIP No.                        N47279109                        Page 5

Item 8.  Identification and Classification of Members of the Group

     Not applicable 

Item 9.  Notice of Dissolution of Group

     Not applicable

Item 10(a).  Certification

     By signing below I certify, to the best of my knowledge and belief, 
     the securities referred to above were acquired and are held in the 
     ordinary course of business and 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.

Principal Real Estate Investors, LLC

By /s/ Jill Hittner
Jill Hittner, Chief Financial Officer

Dated February 14, 2017



EXHIBIT 99.1

Principal Real Estate Investors, LLC
Item 3 Classification:
(e) Investment Adviser in accordance with Section 240.13d-1(b)(1)(ii)(E)