GREAT LAKES DREDGE & DOCK CO

Ticker: GLDD CUSIP: 390607109 Class: Common Stock

TWO SIGMA SECURITIES, LLC's Holding History (CIK: 0001450144)

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

Q2 2018

Shares 10,384 Value ($000) $55 Avg Close $4.93 Range $4.38 - $5.45

Q1 2018

Shares 23,000 Value ($000) $106 Avg Close $4.74 Range $4.15 - $5.50

Q4 2017

Shares 15,485 Value ($000) $84 Avg Close $5.09 Range $4.22 - $5.70

Q4 2016

Shares 17,562 Value ($000) $74 Avg Close $4.06 Range $3.05 - $5.00

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2018	10,384	$55	$4.93	$4.38 - $5.45
Q1 2018	23,000	$106	$4.74	$4.15 - $5.50
Q4 2017	15,485	$84	$5.09	$4.22 - $5.70
Q4 2016	17,562	$74	$4.06	$3.05 - $5.00