Tetra Tech Inc (TTEK)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock Inc.	5,540,476	$924,871,575	0.02%
2.	Vanguard Group Inc	5,153,853	$860,332,680	0.01%
3.	Pictet Asset Management Holding Sa	2,789,702	$465,684,955	0.51%
4.	Alliancebernstein L.p.	2,637,734	$440,316,937	0.16%
5.	Neuberger Berman Group Llc	1,596,290	$266,468,628	0.23%