X0303 4 2011-03-11 0 0001107694 RACKSPACE HOSTING, INC. RAX 0001105090 KNOOIHUIZEN BRUCE R 5000 WALZEM SAN ANTONIO TX 78218 0 1 0 0 Chief Financial Officer Common Stock 2011-03-11 4 S 0 651 36.2457 D 66396 D These shares were sold pursuant to provisions contained in the Company's Form of RSU Agreement and Amended and Restated 2007 Long Term Incentive Plan for the satisfaction of certain tax obligations. The prices for these sales of shares ranged from $35.92 to $37.18 per share. The registrant undertakes to provide, upon request by the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price. /s/ William Alberts by Power of Attorney 2011-03-11