X0306 4 2014-12-31 0 0000018172 CASTLE A M & CO CAS 0001580941 KNOPP RONALD E 1420 KENSINGTON ROAD SUITE 220 OAK BROOK IL 60523 0 1 0 0 Vice President, Operations Common Stock 2014-12-31 4 M 0 660 A 5714 D Common Stock 2014-12-31 4 F 0 207 7.98 D 5507 D Common Stock 8996.86 I See Note Restricted Stock Units 2014-12-31 4 M 0 660 D 2014-12-31 2014-12-31 Common Stock 660 0 D Each restricted stock unit converted into a share of A.M. Castle & Co. common stock on a one-for-one basis upon vesting on December 31, 2014. Between August 12, 2014, and December 31, 2014, the reporting person's balance decreased by 2.4 shares of common stock under the A.M. Castle & Co. 401(k) Plan. The information in this report is based upon a plan statement dated as of December 31, 2014. Marec E. Edgar, Attorney-in-Fact 2015-01-05