GAMCO Investors’s Mersana Therapeutics MRSN Stock Holding History

GAMCO Investors’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	-10,000	Closed	-$289K	–	1044
2025 Q4	$289K	Buy	+10,000	New	+$190K	﹤0.01%	932

Other funds holding MRSN

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

GAMCO Investors's MRSN Position: Q1 2026 in Review

GAMCO Investors sold out of Mersana Therapeutics (MRSN) in Q1 2026, closing a stake of 10,000 shares — an estimated $289K sold.

GAMCO Investors first reported a position in MRSN in Q4 2025 and held it in 1 quarter. The position peaked at $289K in Q4 2025. 1 fund tracked by Wall St. Rank holds MRSN as of Q1 2026.

GAMCO Investors reported no remaining Mersana Therapeutics position as of Q1 2026 after selling out during the quarter.
GAMCO Investors sold 10,000 Mersana Therapeutics shares in Q1 2026, an estimated $289K.
GAMCO Investors first reported a position in Mersana Therapeutics in Q4 2025 and held it in 1 quarter.
GAMCO Investors's Mersana Therapeutics position peaked at $289K in Q4 2025.
1 fund tracked by Wall St. Rank held Mersana Therapeutics as of Q1 2026.

Based on GAMCO Investors's 13F filing for Q1 2026, filed 14 May 2026.