GREAT LAKES DREDGE & DOCK CO

Ticker: GLDD CUSIP: 390607109 Class: Common Stock

PDT Partners, LLC's Holding History (CIK: 0001564702)

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

Q1 2015

Shares 18,488 Value ($000) $111 Avg Close $7.05 Range $5.53 - $8.64

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2015	18,488	$111	$7.05	$5.53 - $8.64