X0306 4 2015-04-07 0 0001553023 CyrusOne Inc. CONE 0000716133 CINCINNATI BELL INC 221 E FOURTH ST CINCINNATI OH 45202 0 0 1 0 Operating Partnership Units 0 2015-04-07 4 S 0 14260000 29.8752 D Common Stock 14260000 12341835 I See footnote "Operating Partnership Units" are the common units of limited partnership interest in the Issuer's operating partnership, CyrusOne LP, a Maryland limited partnership. Operating Partnership Units are redeemable for cash equal to the then current market value of one share of Common Stock, or at the election of the Issuer, for shares of Common Stock on a one-for-one basis. Operating Partnerships Units are redeemable for cash or shares of Common Stock at any time. The right to convert Operating Partnership Units into shares of Common Stock has no expiration date. Data Centers South Holdings LLC is the record holder of 12,341,835 Operating Partnership Units (the "Controlled OP Units"). Cincinnati Bell Inc. is the sole stockholder of Cincinnati Bell Technology Solutions Inc., which is the sole stockholder of Data Center Investments Inc., which is the sole stockholder of Data Centers South Inc., which is the sole member of Data Centers South Holdings LLC. As a result, Cincinnati Bell Inc. exercises investment discretion and control over the Controlled OP Units. /s/ Christopher J. Wilson 2015-04-09