GREAT LAKES DREDGE & DOCK CO

Ticker: GLDD CUSIP: 390607109 Class: Common Stock

Municipal Employees' Retirement System of Michigan's Holding History (CIK: 0001588873)

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

Q1 2016

Shares 102,000 Value ($000) $455 Avg Close $3.58 Range $2.96 - $4.50

Q4 2015

Shares 103,580 Value ($000) $410 Avg Close $4.43 Range $3.66 - $5.88

Q3 2015

Shares 103,580 Value ($000) $522 Avg Close $5.48 Range $5.00 - $6.17

Q2 2015

Shares 50,900 Value ($000) $303 Avg Close $5.87 Range $5.33 - $6.30

Q1 2015

Shares 50,900 Value ($000) $306 Avg Close $7.05 Range $5.53 - $8.64

Q4 2014

Shares 50,900 Value ($000) $436 Avg Close $7.24 Range $5.84 - $8.73

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2016	102,000	$455	$3.58	$2.96 - $4.50
Q4 2015	103,580	$410	$4.43	$3.66 - $5.88
Q3 2015	103,580	$522	$5.48	$5.00 - $6.17
Q2 2015	50,900	$303	$5.87	$5.33 - $6.30
Q1 2015	50,900	$306	$7.05	$5.53 - $8.64
Q4 2014	50,900	$436	$7.24	$5.84 - $8.73