COMPASS MINERALS INTL INC

Ticker: CMP CUSIP: 20451N101 Class: Common Stock

Chesley Taft & Associates LLC's Holding History (CIK: 0001164632)

Note: Option positions (PUT/CALL) are excluded.

Q4 2016

Shares 7,860 Value ($000) $616 Avg Close $57.67 Range $53.18 - $62.97

Q3 2016

Shares 7,860 Value ($000) $579 Avg Close $54.44 Range $50.92 - $57.62

Q2 2016

Shares 12,395 Value ($000) $920 Avg Close $56.40 Range $49.77 - $60.87

Q1 2016

Shares 12,570 Value ($000) $891 Avg Close $52.78 Range $48.71 - $56.62

Q4 2015

Shares 12,810 Value ($000) $964 Avg Close $59.61 Range $52.17 - $63.00

Q3 2015

Shares 12,750 Value ($000) $999 Avg Close $59.53 Range $56.23 - $62.65

Q2 2015

Shares 10,960 Value ($000) $900 Avg Close $63.39 Range $59.23 - $68.67

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2016	7,860	$616	$57.67	$53.18 - $62.97
Q3 2016	7,860	$579	$54.44	$50.92 - $57.62
Q2 2016	12,395	$920	$56.40	$49.77 - $60.87
Q1 2016	12,570	$891	$52.78	$48.71 - $56.62
Q4 2015	12,810	$964	$59.61	$52.17 - $63.00
Q3 2015	12,750	$999	$59.53	$56.23 - $62.65
Q2 2015	10,960	$900	$63.39	$59.23 - $68.67