| Date | Event |
| 17-Nov-09 | SIGMA ALDRICH CORP Files SEC form 8-K, Amendments to Articles of Inc. or Bylaws; Change in Fiscal Year |
| 6-Nov-09 | Coverage initiated on Sigma-Aldrich by Jefferies & Co |
| 30-Oct-09 | SIGMA ALDRICH CORP Files SEC form 10-Q, Quarterly Report |
| 22-Oct-09 | SIGMA ALDRICH CORP Files SEC form 8-K, Results of Operations and Financial Condition, Regulation FD Disclosure, Finan |
| 21-Oct-09 | Price hit new 52-week high ($56.29) |
| 6-Oct-09 | SIGMA ALDRICH CORP Files SEC form 8-K, Change in Directors or Principal Officers, Regulation FD Disclosure, Financial |
| 28-Aug-09 | Ex-Date for dividend payment of $0.145 |
| 3-Aug-09 | SIGMA ALDRICH CORP Files SEC form 10-Q, Quarterly Report |
| 23-Jul-09 | SIGMA ALDRICH CORP Files SEC form 8-K, Results of Operations and Financial Condition, Regulation FD Disclosure, Finan |
| 8-May-09 | SIGMA ALDRICH CORP Files SEC form 8-K, Other Events, Financial Statements and Exhibits |
| 5-May-09 | SIGMA ALDRICH CORP Files SEC form 10-Q, Quarterly Report |
| 23-Apr-09 | SIGMA ALDRICH CORP Files SEC form 8-K, Results of Operations and Financial Condition, Regulation FD Disclosure, Finan |
| 16-Apr-09 | SIGMA ALDRICH CORP Files SEC form 8-K, Change in Directors or Principal Officers, Financial Statements and Exhibits |
| 18-Mar-09 | SIGMA ALDRICH CORP Files SEC form 8-K, Regulation FD Disclosure |
| 9-Mar-09 | Price hit new 52-week low ($31.45) |
| 6-Mar-09 | Price hit new 52-week low ($31.96) |
| 5-Mar-09 | Price hit new 52-week low ($32.45) |
| 13-Feb-09 | SIGMA ALDRICH CORP Files SEC form 8-K, Change in Directors or Principal Officers |
| 11-Feb-09 | SIGMA ALDRICH CORP Files SEC form 8-K, Results of Operations and Financial Condition, Regulation FD Disclosure, Finan |
| 31-Dec-08 | SIGMA ALDRICH CORP Files SEC form 8-K, Change in Directors or Principal Officers, Financial Statements and Exhibits |
| 13-Nov-08 | SIGMA ALDRICH CORP Files SEC form 8-K, Other Events, Financial Statements and Exhibits |
| 10-Nov-08 | SIGMA ALDRICH CORP Files SEC form 10-Q, Quarterly Report |
| 5-Nov-08 | SIGMA ALDRICH CORP Files SEC form 8-K, Change in Directors or Principal Officers, Other Events, Financial Statements |