Avidity Partners Management LP

SEC CIK: 0001791827
Latest filing: Aug 14, 2026

SEC filings (opens in a new tab)

MRSN holding history

Mersana Therapeutics, Inc. in every 13F filed by Avidity Partners Management LP, including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.

MRSN overview All 13F holders of MRSN Full Q2 2026 holdings

Shares (Q3 2023): 0; Sold out in Q3 2023
Value: $0
% of portfolio: 0.0%
Quarters held: 2; Since Q1 2023

Holdings of MRSN by Avidity Partners Management LP, by quarter
Quarter	Shares	Value	% of portfolio	Share change	Action	All holders
Q3 2023	0	$0	0.0%	−3,790,000−100.0%	Sold out	Holders
Q2 2023	3,790,000	$12.5M	0.4%	+356,767+10.4%	Added	Holders
Q1 2023	3,433,233	$14.1M	0.5%	+3,433,233	New	Holders