Repligen Corp (RGEN)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	6,857,260	$987,033,998	0.01%
2.	Vanguard Group Inc	5,101,090	$734,250,895	0.01%
3.	State Street Corp	1,691,208	$243,432,480	0%
4.	Champlain Investment Partners, Llc	1,543,530	$222,175,708	1.4%
5.	Sands Capital Management, Llc	1,364,258	$196,371,297	0.58%