Sigma-Aldrich Corporation Reports 10% Increase in Q1 2010 Sales; First Quarter 2010 Diluted EPS Up 19% to $0.81; Full Year 2010 Diluted Adjusted EPS Expectation Raised to $3.05-$3.20

HIGHLIGHTS:

2010 Results (all percentages are to comparable periods in 2009)

* Q1 2010 reported sales increased 10.2% to $572 million. Excluding the impact of changes in currency exchange rates, Q1 sales grew organically by 4.4% with SAFC and Research sales increases of 9.0% and 2.8%, respectively.

* Q1 2010 reported diluted EPS increased by 19.1% to $0.81. Excluding the impact of restructuring costs of $0.03 in 2010's first quarter, diluted EPS increased 23.5% to $0.84.

* Q1 2010 net cash provided by operating activities and free cash flow were $151 million and $133 million, respectively.