FARMER JEREMY G O 4

4 · AON CORP · Filed Feb 23, 2011

Form 4

Period: 2011-02-20

Senior VP & Head of HR

Transactions

Tax Payment
Common Stock
2011-02-20$52.93/sh−264$13,974→ 58,088 total
Exercise/Conversion
Common Stock
2011-02-20+839→ 58,352 total
Exercise/Conversion
Employee Stock Option (Right to Buy)
2011-02-22−3,920→ 0 total
Exercise: $25.51From: 2007-07-14Exp: 2015-07-14→ Common Stock (3,920 underlying)
Tax Payment
Common Stock
2011-02-22$52.24/sh−735$38,396→ 59,270 total
Tax Payment
Common Stock
2011-02-22$52.93/sh−1,889$99,985→ 61,301 total
Exercise/Conversion
Restricted Stock Unit Award (Right to Receive)
2011-02-20−839→ 838 total
From: 2011-02-20Exp: 2011-02-20→ Common Stock (839 underlying)
Exercise/Conversion
Common Stock
2011-02-22+1,917→ 60,005 total
Exercise/Conversion
Common Stock
2011-02-22$25.51/sh+3,920$99,999→ 63,190 total
Exercise/Conversion
Restricted Stock Unit Award (Right to Receive)
2011-02-22−1,917→ 0 total
From: 2011-02-22Exp: 2011-02-22→ Common Stock (1,917 underlying)

Footnotes (5)

[F1]Shares of common stock acquired upon the vesting of a restricted stock unit award.
[F2]Shares of common stock withheld by the issuer for the payment of withholding taxes in connection with the vesting of a restricted stock unit award.
[F3]The restricted stock unit award converts to shares of common stock on a 1-for-1 basis.
[F4]Includes 924 shares held pursuant to the Aon employee stock purchase plan.
[F5]The original option grant of 7,970 shares vested as follows: 130 shares vested on July 14, 2007, and 3,920 shares vested on each of July 14, 2008 and July 14, 2009.

Documents

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