UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Notice of Effectiveness
Effectiveness Date: April 5, 2011 12:00 P.M.
Form: S-1
CIK: 0001509228
Company Name: SandRidge Mississippian Trust I
File Number: 333-171551
CIK: 0001349436
Company Name: SANDRIDGE ENERGY INC
File Number: 333-171551-01