Hay James S 4

4 · MWI Veterinary Supply, Inc. · Filed Sep 2, 2011

Form 4

Period: 2011-09-01

Chief Information Officer

Transactions

Exercise/Conversion
Employee Stock Option (right to buy)
2011-09-01−898→ 0 total
Exercise: $0.18From: 2009-09-30Exp: 2012-06-18→ Common Stock, par value $0.01 per share (898 underlying)
Exercise/Conversion
Common Stock, par value $0.01 per share
2011-09-01$0.18/sh+1,500$273→ 5,502 total
Sale
Common Stock, par value $0.01 per share
2011-09-01$74.00/sh−1,500$110,998→ 4,002 total
Exercise/Conversion
Employee Stock Option (right to buy)
2011-09-01−602→ 0 total
Exercise: $0.18From: 2008-09-30Exp: 2012-06-18→ Common Stock, par value $0.01 per share (602 underlying)

Footnotes (2)

[F1]The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 18, 2010.
[F2]The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $73.50 to $74.39, inclusive. Mr. Hay 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.

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