On May 16th, the company released the news in an 8K report that Michael Hogan would retire from the CFO and CAO positions as soon as a replacement could be found. The news sent stocks lower for the next few trading sessions. Hogan was a well respected figure in the company. Since he came to Sigma-Aldrich in 1999, Hogan has seen the company's sales double from around $1 Bil. annually to nearly $2 Bil. in 2007. Sigma-Aldrich's stock price has also quadrupled during Hogan's tenure, rising steadily from $14.50/share to a price of $62.24/share the day of the announcement.