Mercury Systems Inc (MRCY)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	8,477,158	$656,131,994	0.01%
2.	Vanguard Group Inc	5,731,033	$443,581,953	0.01%
3.	State Street Corp	3,055,358	$236,484,709	0.01%
4.	William Blair Investment Management, Llc	2,487,957	$192,567,872	0.5%
5.	Conestoga Capital Advisors, Llc	2,279,909	$176,464,957	2.83%