X0306 4 2013-05-06 0 0001227654 COMPASS MINERALS INTERNATIONAL INC CMP 0001418451 Bucan Gerald 9900 W. 109TH ST. OVERLAND PARK KS 66210 0 1 0 0 VP and General Manager Common Stock 2013-05-06 4 M 0 8100 36.00 A 14305 D Common Stock 2013-05-06 4 S 0 8100 86.87 D 6205 D Common Stock 238 I Company 401(k) Plan Restricted Stock Unit 0 2014-03-10 2014-03-10 Common Stock 1793 1793 D Restricted Stock Unit 0 2015-03-12 2015-03-12 Common Stock 2162 2162 D Restricted Stock Unit 0 2016-03-11 2016-03-11 Common Stock 1948 1948 D Stock Option (Right to buy) 36 2013-05-06 4 M 0 8100 D 2008-11-12 2014-11-12 Common Stock 8100 0 D Stock Option (Right to Buy) 58.99 2010-03-10 2016-03-10 Common Stock 8453 8453 D Stock Opton (Right to Buy) 78.51 2011-03-10 2017-03-10 Common Stock 5524 5524 D Stock Opton (Right to Buy) 86.47 2012-03-10 2018-03-10 Common Stock 3237 3237 D Stock Option (Right to Buy) 71.69 2013-03-12 2019-03-12 Common Stock 4286 4286 D Stock Option (Right to Buy) 76.99 2014-03-11 2020-03-11 Common Stock 4839 4839 D Performance Stock Unit 0 2014-03-10 2014-03-10 Common Stock 1013 1013 D Performance Stock Unit 0 2015-03-12 2015-03-12 Common Stock 1342 1342 D Performance Stock Unit 0 2016-03-11 2016-03-11 Common Stock 1447 1447 D The 8,100 shares were traded in blocks ranging in price from $86.80 to $86.95. $86.87 is the weighted average price. Information regarding the number of shares sold at each separate price is available upon request by the SEC staff, the issuer, or any security holder of the issuer. The information in this report is based on a 401(k) plan statement dated as of 03-08-13. All Stock Options have a conversion price of $0.00. /s/ Robert E. Marsh, Attorney-In-Fact 2013-05-07