Tetra Tech Inc (TTEK)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	27,185,795	$795,184,505	0.01%
2.	Blackrock, Inc.	26,439,478	$773,354,724	0.02%
3.	Pictet Asset Management Holding Sa	14,502,940	$424,209,130	0.47%
4.	State Street Corp	10,678,928	$312,358,644	0.01%
5.	Neuberger Berman Group Llc	8,940,748	$261,516,883	0.22%