X0303 4 2010-03-12 0 0000082020 UNITED STATES LIME & MINERALS INC USLM 0001204973 BYRNE TIMOTHY W 5429 LBJ FREEWAY SUITE 230 DALLAS TX 75240 1 1 0 0 President & CEO USLM Common Stock 2010-03-12 4 S 0 4000 40.4936 D 27673 D USLM Common Stock 6845 I Held in 401(k) Plan The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $40.033 to $40.8568, inclusively. The reporting person undertakes to provide United States Lime & Minerals, Inc., any security holder of United States Lime & Minerals, Inc. and the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price with the range set forth in this footnote. M Michael Owens (POA) 2010-03-16