X0306 4 2012-10-04 0 0001323974 MWI Veterinary Supply, Inc. MWIV 0001334044 Rebholtz Robert N JR 3041 W. PASADENA DR. BOISE ID 83705 1 0 0 0 Common Stock, par value $0.01 per share 32500 D Common Stock, par value $0.01 per share 2012-10-04 4 S 0 2957 107.6607 D 133595 I See footnote Common Stock, par value $0.01 per share 2012-10-05 4 S 0 3335 108.3142 D 130260 I See footnote Common Stock, par value $0.01 per share 2012-10-05 4 S 0 633 109.2581 D 129627 I See footnote Common Stock, par value $0.01 per share 2012-10-08 4 S 0 1700 107.8512 D 127927 I See footnote Common Stock, par value $0.01 per share 2012-10-08 4 S 0 200 108.3352 D 127727 I See footnote Common Stock, par value $0.01 per share 2012-10-09 4 S 0 3229 105.8492 D 124498 I See footnote Common Stock, par value $0.01 per share 2012-10-09 4 S 0 600 106.9217 D 123898 I See footnote Common Stock, par value $0.01 per share 2012-10-09 4 S 0 200 107.9050 D 123698 I See footnote The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by The Rebholtz Descendants Trust on September 8, 2012. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $107.32 to $107.98, inclusive. Mr. Rebholtz has provided to MWI Veterinary Supply, Inc. (the "Company") and undertakes to provide to any security holder of the Company, 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 this footnote. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $107.88 to $108.86, inclusive. Mr. Rebholtz has provided to the Company and undertakes to provide to any security holder of the Company, 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 this footnote. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $108.89 to $109.48, inclusive. Mr. Rebholtz has provided to the Company and undertakes to provide to any security holder of the Company, 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 this footnote. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $107.23 to $108.20, inclusive. Mr. Rebholtz has provided to the Company and undertakes to provide to any security holder of the Company, 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 this footnote. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $108.25 to $108.37, inclusive. Mr. Rebholtz has provided to the Company and undertakes to provide to any security holder of the Company, 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 this footnote. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $105.61 to $106.60, inclusive. Mr. Rebholtz has provided to the Company and undertakes to provide to any security holder of the Company, 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 this footnote. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $106.68 to $107.10, inclusive. Mr. Rebholtz has provided to the Company and undertakes to provide to any security holder of the Company, 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 this footnote. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $107.86 to $107.95, inclusive. Mr. Rebholtz has provided to the Company and undertakes to provide to any security holder of the Company, 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 this footnote. Held by The Rebholtz Descendants' Trust for the benefit of Mr. Rebholtz's family and certain other persons. Mr. Rebholtz expressly disclaims beneficial ownership of any shares held by such trust that exceed his pecuniary interest therein. Ryan Cleverley as attorney-in-fact for Robert N. Rebholtz, Jr. 2012-10-09