🕵️ Mersana Therapeutics, Inc. ($MRSN)

SEC insider & ownership activity, last 12 months · CIK 1442836 · every row links its SEC filing

Over the last 12 months insiders sold $762 with no open-market buying against it. Mohan Bala sold $762 through a 10b5-1 trading plan in 1 lots (Oct). One red-flag 8-K in the window: Delisting notice (3.01), Jan 5, 2026.

Oct 2025: net -$762 Nov 2025: net +$0 Dec 2025: net +$0 Jan 2026: net +$0 Feb 2026: net +$0 Mar 2026: net +$0 Apr 2026: net +$0 May 2026: net +$0 Jun 2026: net +$0 Jul 2026: net +$0 Aug 2026: net +$0 Sep 2026: net +$0
Monthly net open-market insider flow, last 12 months (up = net buying)

Insider flow

0 buyers, $0 (0 lots) · 1 seller, $762 (1 lots)

InsiderBuysBoughtSellsSoldLast
Mohan Bala0– 1$762Oct 27, 2025

5%+ holders

HolderStakeClassScheduleEvent
Nextech Crossover I GP S.A. R.L. 10.4% 13GDec 26, 2024 filing ↗
Nextech Crossover I. SCSp 10.4% 13GDec 26, 2024 filing ↗
Ian Charoub 10.4% 13GDec 26, 2024 filing ↗
Costas Constantinides 10.4% 13GDec 26, 2024 filing ↗
Rocco Sgobbo 10.4% 13GDec 26, 2024 filing ↗
ECOR1 Capital, LLC 10.0% 13GDec 23, 2024 filing ↗
Oleg Nodelman 10.0% 13GDec 23, 2024 filing ↗
ECOR1 Capital Fund Qualified, L.P. 9.4% 13GDec 23, 2024 filing ↗

Planned insider sales (Form 144)

No sale notices filed in the last 12 months.

Material events (8-K)

ItemEvent date
Agreement terminated (1.02)Jan 5, 2026 filing ↗
Acquisition or disposition (2.01)Jan 5, 2026 filing ↗
Delisting notice (3.01)Jan 5, 2026 filing ↗
Material Modifications to Rights of Security Holders (3.03)Jan 5, 2026 filing ↗
Change of control (5.01)Jan 5, 2026 filing ↗
Officer/director changes (5.02)Jan 5, 2026 filing ↗
Charter/bylaw changes (5.03)Jan 5, 2026 filing ↗
Financial Statements and Exhibits (9.01)Jan 5, 2026 filing ↗
Earnings (2.02)Nov 14, 2025 filing ↗
Financial Statements and Exhibits (9.01)Nov 14, 2025 filing ↗
Material agreement (1.01)Nov 12, 2025 filing ↗
Other events (8.01)Nov 12, 2025 filing ↗
Financial Statements and Exhibits (9.01)Nov 12, 2025 filing ↗