Insider Trades - PORWOLL JOE

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PORWOLL JOE: Declared Holdings
Company/Relationship	Reported	Shares	Ownership
Sigma-Aldrich Corporation Officer NasdaqGS:SIAL (historical quotes, profile, SEC, other insiders)	17-Feb-09	8,840	Direct

Insider & restricted shareholder transactions reported over the last two years
Date Shares Stock Transaction
17-Feb-09 540 SIAL Acquisition (Non Open Market) at $37.56 per share.
(Value of $20,282)
11-Nov-08 200 SIAL Disposition (Non Open Market) at $41.38 per share.
(Value of $8,276)
30-Jul-08 5,400 SIAL Option Exercise at $18.25 per share.
(Cost of $98,550)
30-Jul-08 5,400 SIAL Sale at $61 per share.
(Proceeds of $329,400)
26-Feb-08 7,400 SIAL Option Exercise at $13.44 - $56.39 per share.

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Insider & restricted shareholder transactions reported over the last two years
Date	Shares	Stock	Transaction
17-Feb-09	540	SIAL	Acquisition (Non Open Market) at $37.56 per share. (Value of $20,282)
11-Nov-08	200	SIAL	Disposition (Non Open Market) at $41.38 per share. (Value of $8,276)
30-Jul-08	5,400	SIAL	Option Exercise at $18.25 per share. (Cost of $98,550)
30-Jul-08	5,400	SIAL	Sale at $61 per share. (Proceeds of $329,400)
26-Feb-08	7,400	SIAL	Option Exercise at $13.44 - $56.39 per share.