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 Filings

13D/G Filers

Investors who own more than 5% of a class must file a Schedule 13D or 13G. 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 Filings Shares, Excl. Options Value, Excl. Options
2026 Q1 1 3.00 $87.00
2025 Q4 51 2.24 M $64.8 M
2025 Q3 46 3.13 M $24.3 M
2025 Q2 2 228 k $68.5 k