Millennium Management’s Mersana Therapeutics MRSN Stock Holding History

Millennium Management’s Portfolio MRSN Stock Details MRSN Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2023 Q3	–	Sell	-9,932	Closed	-$817K	–	6393
2023 Q2	$817K	Buy	+9,932	New	+$1.45M	﹤0.01%	4191
2021 Q1	–	Sell	-2,884	Closed	-$1.92M	–	6303
2020 Q4	$1.92M	Buy	2,884 +684	+31%	+$380K	﹤0.01%	3270
2020 Q3	$1.02K	Buy	+2,200	New	+$1.11M	﹤0.01%	3115

Other funds holding MRSN

IFP Advisors Tampa, Florida $5.54B AUM 27.43% 1-Year Est. Return

Millennium Management's MRSN Position: Q1 2026 in Review

Millennium Management sold out of Mersana Therapeutics (MRSN) in Q1 2026, closing a stake of 63,305 shares — an estimated $1.83M sold.

Millennium Management first reported a position in MRSN in Q2 2017 and held it in 31 quarters. The position peaked at $25.6M in Q3 2022. 1 fund tracked by Wall St. Rank holds MRSN as of Q1 2026.

Millennium Management reported no remaining Mersana Therapeutics position as of Q1 2026 after selling out during the quarter.
Millennium Management sold 63,305 Mersana Therapeutics shares in Q1 2026, an estimated $1.83M.
Millennium Management first reported a position in Mersana Therapeutics in Q2 2017 and held it in 31 quarters.
Millennium Management's Mersana Therapeutics position peaked at $25.6M in Q3 2022.
1 fund tracked by Wall St. Rank held Mersana Therapeutics as of Q1 2026.

Based on Millennium Management's 13F filing for Q1 2026, filed 15 May 2026.