Gibraltar Industries Inc. (ROCK)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	5,496,704	$323,755,866	0%
2.	Vanguard Group Inc	2,990,179	$176,121,544	0%
3.	Dimensional Fund Advisors Lp	1,663,416	$97,975,252	0.02%
4.	Wellington Management Group Llp	1,541,070	$90,769,023	0.01%
5.	State Street Corp	1,331,857	$78,446,377	0%