Bwx Technologies Inc. (BWXT)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock Inc.	9,453,104	$725,336,643	0.01%
2.	Vanguard Group Inc	8,677,218	$665,802,938	0.01%
3.	Wellington Management Group Llp	4,831,571	$370,726,443	0.06%
4.	William Blair Investment Management, Llc	4,634,887	$355,634,880	1.03%
5.	State Street Corp	3,575,302	$274,332,922	0.01%