Optimer Pharmaceuticals - Investment Calculator

Investment Calculator

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Calculate Current Value and Shares Since: February 9, 2007

Investment Date:	Original Shares:	Original Value:	Current Shares:	Current Value:	Percent Return:
Feb 9, 2007	133	$ 1,000.00	133	$ 1,246.67	24.67%

Investment of $ 1,000.00 on Feb 9, 2007 would yield $ 1,246.67 today

Adjustments

Date	Reason	Factor	Shares	Price	Value	%
Feb 9, 2007	Initial Investment		133	7.50	$1,000.00	0.00%
Jul 28, 2010	Current Investment		133	9.35	$1,246.67	24.67%

The Investment Calculator page and related information is provided by Mergent, a third party service. Optimer Pharmaceuticals, Inc. does not maintain this page and is not responsible for the accuracy, completeness or timeliness of the information. The results are for illustrative purposes only and should not be relied on for investment purposes. The timing and price of dividend reinvestments, taxes, commissions and other factors may affect the values shown. Please note that historical investment performance is not intended to indicate future performance.