Great Lakes Dredge & Dock Corp (GLDD)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	6,897,215	$90,491,461	0%
2.	Dimensional Fund Advisors Lp	4,300,112	$56,417,781	0.01%
3.	Vanguard Group Inc	3,987,334	$52,313,822	0%
4.	Jennison Associates Llc	3,806,504	$49,941,331	0.03%
5.	American Century Companies Inc	2,584,604	$33,910,004	0.02%