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. Every filing for 59045L205 since 12/18/2024, newest first.

Filer % of Class Filed
683 Capital Management, LLC 13G/A Amendment 2
0% 5/15/2026
Event 3/31/2026
683 Capital Management, LLC 13G/A Amendment 1
7.0% 2/17/2026
Event 12/31/2025
Vanguard Group Inc 13G/A Amendment 2 4.2% 1/30/2026
Event 12/31/2025
Nextech Crossover I GP S.a r.l. 13G/A Amendment 3
0% 1/9/2026
Event 1/6/2026
Bain Capital Life Sciences Fund II, L.P. 13D/A Amendment 8
0% 1/8/2026
Event 1/6/2026
683 Capital Management, LLC 13G
5.5% 11/24/2025
Event 11/17/2025
Bain Capital Life Sciences Fund II, L.P. 13D/A Amendment 7
4.0% 11/13/2025
Event 11/12/2025

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