Gibraltar Industries Inc. (ROCK)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	5,234,148	$307,035,121	0.01%
2.	Vanguard Group Inc	2,995,655	$175,725,122	0%
3.	Wellington Management Group Llp	2,012,178	$118,034,363	0.02%
4.	Dimensional Fund Advisors Lp	1,705,566	$100,048,796	0.02%
5.	State Street Corp	1,282,604	$75,237,551	0%