Tetra Tech Inc (TTEK)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	26,026,774	$1,036,906,660	0.02%
2.	Vanguard Group Inc	25,912,103	$1,032,338,183	0.01%
3.	Pictet Asset Management Holding Sa	14,018,887	$558,512,458	0.6%
4.	State Street Corp	9,257,926	$368,835,772	0.01%
5.	Neuberger Berman Group Llc	8,709,732	$346,995,716	0.27%