This excerpt taken from the ACM DEF 14A filed Jan 25, 2008.
There are no equity ownership requirements or guidelines that any of our employees must meet or maintain. We have a broad base of stock ownership by employees (including our Named Executive Officers) and believe that this enhances our success by aligning the interests of our employees and stockholders. We encourage Named Executive Officers to invest in our common stock through payroll deductions invested in our stock and matched by our typical company match formula, the grants of PEPs and in certain cases, stock options. In February 2007, we sold 36,209 shares (including 3,753 company stock match shares) of our common stock to our Chief Corporate Officer, who paid $500,000 for such shares.