Great Lakes Dredge & Dock Corp (GLDD)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	7,163,887	$62,325,815	0%
2.	Jennison Associates Llc	5,310,894	$46,204,777	0.03%
3.	Dimensional Fund Advisors Lp	4,337,446	$37,735,890	0.01%
4.	Vanguard Group Inc	3,907,174	$33,992,413	0%
5.	Alliancebernstein L.p.	2,685,229	$23,361,492	0.01%