MERSANA THERAPEUTICS INC

Historical 13F Holders

Symbol
MRSN
CUSIP
59045L205
All holders as of
Q1 2026
Type
Equity
Class
COM
Reported Value, Excluding Options
Total Shares Held, Excluding Options
Total Filers

13D/G Filers

Each filer's latest filing for 59045L205 since 12/18/2024, largest first.

Filer % of Class Filed
Under 5%, checked the "5 percent or less" box, or amended by a later filing (4)
Vanguard Group Inc 13G/A 4.2% 1/30/2026
Event 12/31/2025
683 Capital Management, LLC 13G/A
0% 5/15/2026
Event 3/31/2026
Bain Capital Life Sciences Fund II, L.P. 13D/A
0% 1/8/2026
Event 1/6/2026
Nextech Crossover I GP S.a r.l. 13G/A
0% 1/9/2026
Event 1/6/2026

13F Holders by Quarter

Period Filers Shares, Excl. Options Value, Excl. Options
2026 Q1 1 3.00 $87
2025 Q4 49 2.24 M $64.8M
2025 Q3 45 3.13 M $24.3M
2025 Q2 2 228 k $68.5k