Great Lakes Dredge & Dock Corp (GLDD)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	6,937,720	$83,183,263	0%
2.	Dimensional Fund Advisors Lp	4,323,251	$51,835,142	0.01%
3.	Jennison Associates Llc	4,274,268	$51,248,475	0.03%
4.	Vanguard Group Inc	3,879,301	$46,512,818	0%
5.	American Century Companies Inc	2,412,467	$28,925,479	0.01%