X0303 4/A 2011-01-18 2011-01-19 0000092416 SOUTHWEST GAS CORP SWX 0001446274 Haller Karen S 5241 SPRING MOUNTAIN ROAD LAS VEGAS NV 89150-0002 1 VP/General Counsel, Compliance Common Stock 2011-01-18 4 A 0 2148.0281 36.7160 A 10612.8279 D Common Stock 2011-01-18 4 A 0 1106.8787 37.8700 A 11719.7066 D Common Stock 2011-01-19 4 F 0 280.6452 36.6700 D 11439.0614 D Amended to correct MIP data reported 1-19-11. Amended to correct RSUP data reported 1-19-11. MIP shares not distributed due to tax withholding Karen W. Stanfield, POA 2011-01-27