X0306 4 2012-08-08 0 0001397516 REX ENERGY CORP REXX 0001267380 SHANER LANCE T 1241 ROYAL PALM WAY BOCA RATON FL 33432 1 0 0 0 Common Stock 2012-08-08 4 S 0 147697 13.28 D 6118895 D Common Stock 2012-08-08 4 S 0 26700 13.25 D 636816 I Shaner Family Partners L.P. Common Stock 2012-08-08 4 S 0 60883 13.24 D 812818 I Shaner Capital L.P. Common Stock 2012-08-08 4 S 0 25105 13.20 D 162338 I Shaner Family Foundation Common Stock 74229 I Lance T. Shaner Irrevocable Grandchildren's Trust II Common Stock 136352 I Lance T. Shaner 2009 Spousal Remainder Trust The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.00 to $13.70, inclusive. The reporting person undertakes to provide Rex Energy Corporation, any security holder of Rex Energy Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes 1-4 to this form. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.00 to $13.50, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.00 to $13.72, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.00 to $13.73, inclusive. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 27, 2012. The reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for the purposes of Section 16 or for any other purpose. /s/ Jennifer L. McDonough for Lance T. Shaner 2012-08-10