X0303 4 2010-03-18 0 0000018172 CASTLE A M & CO CAS 0001327329 Stephens Scott F 3400 NORTH WOLF RD. FRANKLIN PARK IL 60131 0 1 0 0 Vice President, CFO & Treas. Restricted Stock Units 2010-03-18 4 A 0 13100 0 A Common Stock 13100 13100 D Performance Share Unit 2010-03-18 4 A 0 13100 0 A Common Stock 13100 13100 D Employee Stock Option (right to buy) 12.79 2010-03-18 4 A 0 25500 0 A 2013-03-18 2018-03-17 Common Stock 25500 25500 D Each restricted stock unit represents a contingent right to receive one share of common stock of A. M. Castle & Co. (the "Company"). The restricted stock units vest in full on December 31, 2012, provided the reporting person is employed by A. M. Castle & Co. on the vesting date. Each performance share unit (PSU) represents a contingent right to receive one share of A. M. Castle & Co. common stock. The grant amount of 13,100 PSUs assumes 100% vesting. Since payout for PSUs can range from 0% to 200%, the maximum number of shares that could vest and be distributed is 26,200. The PSUs will vest on December 31, 2012, if the reporting person remains employed by the Company over the performance period and the Company determines that it achieved certain total shareholder return ("TSR") performance goals. The performance period begins on January 1, 2010 and ends December 31, 2012. Once vested, payout for PSU's can range from 0% to 200% based on the Company's relative TSR over the performance period as compared to a group of peer companies. TSR is measured generally as the increase or decrease in the market value of Company common stock including the reinvestment of dividends. Robert J. Perna, Attorney-in-Fact 2010-03-22