Pioneer Natural Resources Co (PXD)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	20,256,685	$4,555,323,322	0.09%
2.	Blackrock Inc.	15,683,391	$3,526,880,940	0.08%
3.	State Street Corp	14,576,114	$3,277,876,516	0.15%
4.	Massachusetts Financial Services Co	6,661,169	$1,497,963,685	0.48%
5.	Jpmorgan Chase & Co	6,171,183	$1,387,776,057	0.14%