Tetra Tech Inc (TTEK)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	26,301,722	$877,951,480	0.01%
2.	Blackrock, Inc.	25,506,017	$851,390,862	0.01%
3.	Pictet Asset Management Holding Sa	14,189,245	$473,641,448	0.46%
4.	State Street Corp	11,292,728	$376,951,261	0.01%
5.	Neuberger Berman Group Llc	9,027,698	$301,344,548	0.22%