Mersana Therapeutics Inc. (MRSN)

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Institutional Investors' Holdings

Filing Period: Filing is Ongoing

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	8,377,767	$2,881,951	0%
2.	Blackrock, Inc.	8,326,182	$2,865,872	0%
3.	Deutsche Bank Ag\	839,724	$285,507	0%
4.	Goldman Sachs Group Inc	586,658	$201,928	0%
5.	Bank Of New York Mellon Corp	346,188	$119,158	0%