X0305 4 2012-03-28 0 0001028215 KMG CHEMICALS INC KMGB 0001183110 HATCHER DAVID L 9555 W. SAM HOUSTON PKWY S. SUITE 600 HOUSTON TX 77099 1 0 1 0 Common Stock 2012-03-28 4 S 0 681 18.8202 D 2431879 D Common Stock 2012-03-30 4 S 0 2000 18.3638 D 2429879 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.76 to $18.90, inclusive. The reporting person undertakes to provide KMG Chemicals, Inc., any security holder of KMG Chemicals, Inc, 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 footnote (1) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.35 to $18.3750, inclusive. The reporting person undertakes to provide KMG Chemicals, Inc., any security holder of KMG Chemicals, Inc, 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 footnote (2) to this Form 4. Roger C Jackson POA from David L Hatcher 2012-04-02