XO Communications 2010 Annual Report Download - page 88

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SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.
XO HOLDINGS, INC.
March 31, 2011 /s/ Carl J. Grivner
Carl J. Grivner
President and Chief Executive Officer
(Principal Executive Officer)
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed on or
before March 31, 2011 by the following persons on behalf of the registrant and in the capacities indicated.
Name Title
/s/ Carl J. Grivner
Carl J. Grivner
President and Chief Executive Officer, Director
(Principal Executive Officer)
/s/ Laura W. Thomas
Laura W. Thomas
Senior Vice President and Chief Financial Officer
(Principal Financial Officer)
/s/ Harold First
Harold First
Director
/s/ Vincent J. Intrieri
Vincent J. Intrieri
Director
/s/ Robert L. Knauss
Robert L. Knauss
Director
/s/ Dan Ninivaggi
Dan Ninivaggi
Director
/s/ David Schechter
David Schechter
Director
84