Tetra Tech Inc (TTEK)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	26,581,181	$955,859,268	0.02%
2.	Blackrock, Inc.	25,695,493	$924,009,918	0.02%
3.	Pictet Asset Management Holding Sa	13,848,101	$497,977,196	0.51%
4.	State Street Corp	11,941,739	$429,424,934	0.02%
5.	Neuberger Berman Group Llc	8,903,128	$320,156,468	0.25%