Flagship Harbor Advisors’s Mersana Therapeutics MRSN Stock Holding History

Flagship Harbor Advisors’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
2026 Q1	–	Sell	-76	Closed	-$2.2K	–	1625
2025 Q4	$2.2K	Buy	+76	New	+$1.44K	﹤0.01%	1837

Other funds holding MRSN

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

Flagship Harbor Advisors's MRSN Position: Q1 2026 in Review

Flagship Harbor Advisors sold out of Mersana Therapeutics (MRSN) in Q1 2026, closing a stake of 76 shares — an estimated $2.2K sold.

Flagship Harbor Advisors first reported a position in MRSN in Q4 2025 and held it in 1 quarter. The position peaked at $2.2K in Q4 2025. 1 fund tracked by Wall St. Rank holds MRSN as of Q1 2026.

Flagship Harbor Advisors reported no remaining Mersana Therapeutics position as of Q1 2026 after selling out during the quarter.
Flagship Harbor Advisors sold 76 Mersana Therapeutics shares in Q1 2026, an estimated $2.2K.
Flagship Harbor Advisors first reported a position in Mersana Therapeutics in Q4 2025 and held it in 1 quarter.
Flagship Harbor Advisors's Mersana Therapeutics position peaked at $2.2K in Q4 2025.
1 fund tracked by Wall St. Rank held Mersana Therapeutics as of Q1 2026.

Based on Flagship Harbor Advisors's 13F filing for Q1 2026, filed 28 Apr 2026.