Class A shares (non-voting)	Class B shares (one vote each)
Listing	TSX	TSX
Symbol	ACM.A	ACM.B
Recent price(1)	$40.23	$41.00
High / Low last 12 months	$41.84/$29.59	$41.52/$30.00
Shares outstanding(2)	49,848,066	3,094,822
Price / Earnings ratio(3)	18.8x	19.2x
Price / Cash flow ratio	14.7x	15.0x
Price / Book value ratio	2.2x	2.3x
Book value per share	$18.12	$18.12
Dividends per share last 12 months(4)	$0.30	$0.30

(1) As at October 2, 2006.
(2) As at August 31, 2006. Does not include 65,000 special shares entitled to 10 votes each.
(3) The Price/Earnings ratio is calculated on the basis of earnings per share from continuing
     operations before the net future income tax recovery resulting from income tax rate changes
     (see "Income Taxes").
(4) The semi-annual dividend rate has been $0.15 per share since December 7, 2005.