Great Lakes Dredge & Dock Corp (GLDD)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock Inc.	7,403,096	$56,855,779	0%
2.	Alliancebernstein L.p.	4,603,700	$35,356,416	0.01%
3.	Dimensional Fund Advisors Lp	4,356,468	$33,457,789	0%
4.	Jennison Associates Llc	4,299,418	$33,019,531	0.02%
5.	Vanguard Group Inc	3,364,913	$25,842,533	0%