Tetra Tech Inc (TTEK)

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Institutional Investors' Holdings

Filing Period: Filing is Ongoing

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.	Sarasin & Partners Llp	4,628,564	$135,385,540	1.47%
5.	Robecosam Ag	3,192,116	$93,369,394	2.3%