Mersana Therapeutics, Inc.

Pharmaceutical Preparations·CAMBRIDGE, MA

CEO

Huber Martin H. Jr.

Financials

20 shown

Type	Period	Ended	Filed
10-Q	Q3 2025	9/30/25	11/14/25	→
10-Q	Q2 2025	6/30/25	8/13/25	→
10-Q	Q1 2025	3/31/25	5/15/25	→
10-K	FY 2024	12/31/24	3/3/25	→
10-Q	Q3 2024	9/30/24	11/13/24	→
10-Q	Q2 2024	6/30/24	8/13/24	→
↓

Earnings Releases (8-K)

26 shown

Filed	Period
11/14/25	Q4 FY2025	→
8/13/25	Q3 FY2025	→
5/15/25	Q2 FY2025	→
3/3/25	Q1 FY2025	→
11/13/24	Q4 FY2024	→
8/13/24	Q3 FY2024	→
↓

News (8-K)

54 shown

Filed	Type	Description
1/6/26	Delisting	Termination of a Material Definitive Agreement	→
11/13/25	Agreement	Entry into a Material Definitive Agreement	→
9/5/25	Delisting	Notice of Delisting or Failure to Satisfy a Continued Listing Rule	→
7/24/25	Other	Material Modification to Rights of Security Holders	→
7/3/25	Other	Termination of a Material Definitive Agreement	→
6/13/25	Vote	Submission of Matters to a Vote of Security Holders	→
↓

Prospectuses & Registrations

40 shown

Filed	Form	Description
1/6/26	S-8 POS	S-8 POS	→
1/6/26	S-8 POS	S-8 POS	→
1/6/26	S-8 POS	S-8 POS	→
1/6/26	S-8 POS	S-8 POS	→
1/6/26	S-8 POS	S-8 POS	→
1/6/26	S-8 POS	S-8 POS	→
↓

Filing History(703 filings)

TypeDateAccessionPeriodSize

SCHEDULE 13G/A

Feb 17, 2026

0001193805-26-000140

—

7.8 KB

SCHEDULE 13G/A

Feb 17, 2026

0001404574-26-000005

—

9.8 KB

SCHEDULE 13G/A

Jan 30, 2026

0000102909-26-000157

—

6.8 KB

15-12G

Jan 16, 2026

0001104659-26-00455615-12G

—

12.9 KB

SCHEDULE 13G/A

Jan 9, 2026

0001916761-26-000002

—

13.7 KB

EFFECT

Jan 8, 2026

9999999995-26-000105

—

1.8 KB

SCHEDULE 13D/A

Jan 8, 2026

0001193125-26-007752

—

11.3 KB

Jan 6, 2026

0001193125-26-0049254

Jan 6, 2026

31.6 KB

Jan 6, 2026

0001104659-26-001389OWNERSHIP DOCUMENT

Jan 6, 2026

42.9 KB

Jan 6, 2026

0001104659-26-001385OWNERSHIP DOCUMENT

Jan 6, 2026

20.2 KB

Jan 6, 2026

0001104659-26-001382OWNERSHIP DOCUMENT

Jan 6, 2026

32.6 KB

Jan 6, 2026

0001104659-26-001380OWNERSHIP DOCUMENT

Jan 6, 2026

33.0 KB

Jan 6, 2026

0001104659-26-001379OWNERSHIP DOCUMENT

Jan 6, 2026

30.9 KB

Jan 6, 2026

0001104659-26-001377OWNERSHIP DOCUMENT

Jan 6, 2026

55.1 KB

Jan 6, 2026

0001104659-26-001376OWNERSHIP DOCUMENT

Jan 6, 2026

45.4 KB

Jan 6, 2026

0001104659-26-001375OWNERSHIP DOCUMENT

Jan 6, 2026

43.3 KB

Jan 6, 2026

0001104659-26-001374OWNERSHIP DOCUMENT

Jan 6, 2026

46.9 KB

Jan 6, 2026

0001104659-26-001371OWNERSHIP DOCUMENT

Jan 6, 2026

51.8 KB

Jan 6, 2026

0001104659-26-001368OWNERSHIP DOCUMENT

Jan 6, 2026

36.8 KB

Jan 6, 2026

0001104659-26-001365OWNERSHIP DOCUMENT

Jan 6, 2026

45.6 KB

S-8 POS

Jan 6, 2026

0001104659-26-001320S-8 POS

—

30.0 KB

S-8 POS

Jan 6, 2026

0001104659-26-001317S-8 POS

—

30.0 KB

S-8 POS

Jan 6, 2026

0001104659-26-001314S-8 POS

—

30.0 KB

S-8 POS

Jan 6, 2026

0001104659-26-001310S-8 POS

—

30.0 KB

S-8 POS

Jan 6, 2026

0001104659-26-001308S-8 POS

—

30.0 KB

25 filings shown

Filed	Form	Description
4/29/25	DEFA14A	DEFA14A	→
4/29/25	DEF 14A	DEF 14A	→
4/18/25	PRE 14A	PRE 14A	→
4/26/24	DEFA14A	DEFA14A	→
4/26/24	DEF 14A	SCHEDULE 14A	→
4/28/23	DEFA14A	DEFA14A	→
↓

Mersana Therapeutics, Inc.

Financials

Earnings Releases (8-K)

News (8-K)

Prospectuses & Registrations

Filing History(703 filings)

Proxies

Ownership

Other Filings

Filed	Form	Description
1/6/26	4	4	→
1/6/26	4	OWNERSHIP DOCUMENT	→
1/6/26	4	OWNERSHIP DOCUMENT	→
1/6/26	4	OWNERSHIP DOCUMENT	→
1/6/26	4	OWNERSHIP DOCUMENT	→
1/6/26	4	OWNERSHIP DOCUMENT	→
↓

Filed	Form	Description
2/17/26	SCHEDULE 13G/A	SCHEDULE 13G/A	→
2/17/26	SCHEDULE 13G/A	SCHEDULE 13G/A	→
1/30/26	SCHEDULE 13G/A	SCHEDULE 13G/A	→
1/16/26	15-12G	15-12G	→
1/9/26	SCHEDULE 13G/A	SCHEDULE 13G/A	→
1/8/26	EFFECT	EFFECT	→
↓