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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1227654	Compass Minerals International Inc	CMP	Mining & Quarrying Of Nonmetallic Minerals (No Fuels) (1400)	363972986

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1273137	L Rodney Underdown	C/O Compass Minerals International Inc 9900 West 109Th Street, Suite 100 Overland Park KS 66210	Vice President & Cfo	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Disposition	2011-05-11	200	$0.00	48,729	No	5	G	Direct
Common Stock	Acquisiton	2011-05-17	2,500	$25.69	51,229	No	4	M	Direct
Common Stock	Disposition	2011-05-17	2,500	$91.14	48,729	No	4	S	Direct
Common Stock	Acquisiton	2011-05-18	3,000	$25.69	51,729	No	4	M	Direct
Common Stock	Disposition	2011-05-18	3,000	$91.83	48,729	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	5	G	Direct
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Acquisiton	2011-05-17	2,500	$25.69	2,500	$25.69
Common Stock	Stock Option (Right to Buy)	Acquisiton	2011-05-18	3,000	$25.69	3,000	$25.69

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
11,500	2007-01-23	2013-01-23	No	4	M	Direct
8,500	2007-01-23	2013-01-23	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	212	Indirect	Company 401 (k) Plan

Reported Derivative Holdings

Sec. Name	Sec. Type	Price	Date	Expiration Date	Amount	Remaning Holdings	Nature of Ownership
Common Stock	Restricted Stock Unit	$0.00	2012-03-10	2012-03-10	2,756	2,756	Direct
Common Stock	Restricted Stock Unit	$0.00	2013-03-10	2013-03-10	1,974	1,974	Direct
Common Stock	Restricted Stock Unit	$0.00	2014-03-10	2014-03-10	1,966	1,966	Direct
Common Stock	Stock Option (Right to Buy)	$33.44	2008-03-12	2014-03-12	10,000	10,000	Direct
Common Stock	Stock Option (Right to Buy)	$55.12	2009-03-10	2015-03-10	8,071	8,071	Direct
Common Stock	Stock Option (Right to Buy)	$58.99	2010-03-10	2016-03-10	8,453	8,453	Direct
Common Stock	Stock Option (Right to Buy)	$78.51	2011-03-10	2017-03-10	5,524	5,524	Direct
Common Stock	Stock Option (Right to Buy)	$86.47	2012-03-10	2018-03-10	4,429	4,429	Direct
Common Stock	Performance Share Unit	$0.00	2013-03-10	2013-03-10	509	509	Direct
Common Stock	Performance Share Unit	$0.00	2014-03-10	2014-03-10	1,386	1,386	Direct

Expiration Date	Amount	Remaning Holdings	Nature of Ownership
2012-03-10	2,756	2,756	Direct
2013-03-10	1,974	1,974	Direct
2014-03-10	1,966	1,966	Direct
2014-03-12	10,000	10,000	Direct
2015-03-10	8,071	8,071	Direct
2016-03-10	8,453	8,453	Direct
2017-03-10	5,524	5,524	Direct
2018-03-10	4,429	4,429	Direct
2013-03-10	509	509	Direct
2014-03-10	1,386	1,386	Direct

Footnotes

The 2500 shares were traded in blocks ranging in price from $90.92 to $91.25. $91.14 is the weighted average price. Information regarding the number of shares sold at each separate price is available upon request by the SEC staff, this issuer, or any security holder of the issuer.
The 3000 shares were traded in blocks ranging in price from $91.83 to $91.86. $91.83 is the weighted average price. Information regarding the number of shares sold at each separate price is available upon request by the SEC staff, this issuer, or any security holder of the issuer.
The information in this report is based on a 401(k) plan statement dated as of 05-10-11.