Builders Firstsource Inc. (BLDR)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	14,668,049	$2,448,684,100	0.05%
2.	Blackrock Inc.	11,840,403	$1,976,636,870	0.05%
3.	Wellington Management Group Llp	8,203,024	$1,369,412,826	0.25%
4.	State Street Corp	5,807,006	$969,421,582	0.04%
5.	Dimensional Fund Advisors Lp	2,999,174	$500,720,994	0.14%