NASDAQ · MRSN

Mersana Therapeutics, Inc.

Healthcare · Biotechnology

$29.08

Up+$0.00 (+0.00%)

Updated Aug 14, 2026, 8:24 AM

SID Score

4.2/10

Composite research score

Smart Money

—

Institutional and insider signal

Market cap: 142.01M
P/E ratio: -2.01
Dividend yield: 0.00%
52-week range: — – —
Volume: 624.03K
Avg. volume: 112.06K

Price performance

MRSN price history

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Latest MRSN news

The latest Smart Investors Daily articles mentioning MRSN.

sec filingJan 6, 2026

Mersana Therapeutics, Inc. (MRSN) Reports Material Event to SEC

Latest MRSN news

The latest Smart Investors Daily articles mentioning MRSN.

Stock researchResearch & News · SEC Filings

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MRSN research

SEC Filings

Recent regulatory filings and source documents.

SEC filing history

Open a filing to view the original source document.

MRSN SEC filings
Filed	Form	Description	Accepted	Document
Jan 6, 2026	8-K	Form 8-K - Current report - Item 1.02 Item 2.01 Item 3.01 Item 3.03 Item 5.01 Item 5.02 Item 5.03 Item 9.01	—	Open source
Nov 14, 2025	10-Q	Form 10-Q - Quarterly report [Sections 13 or 15(d)]	—	Open source
Nov 14, 2025	8-K	Form 8-K - Current report - Item 2.02 Item 9.01	—	Open source
Nov 13, 2025	8-K	Form 8-K - Current report - Item 1.01 Item 8.01 Item 9.01	—	Open source
Oct 28, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Sep 15, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Sep 5, 2025	8-K	Form 8-K - Current report - Item 3.01	—	Open source
Aug 13, 2025	10-Q	Form 10-Q - Quarterly report [Sections 13 or 15(d)]	—	Open source
Aug 13, 2025	8-K	Form 8-K - Current report - Item 2.02 Item 9.01	—	Open source
Jul 24, 2025	8-K	Form 8-K - Current report - Item 3.03 Item 5.03 Item 9.01	—	Open source
Jul 3, 2025	8-K	Form 8-K - Current report - Item 1.02	—	Open source
Jun 13, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jun 13, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jun 13, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jun 13, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jun 13, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jun 13, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jun 13, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jun 13, 2025	8-K	Form 8-K - Current report - Item 5.07	—	Open source
Jun 2, 2025	8-K	Form 8-K - Current report - Item 7.01 Item 8.01 Item 9.01	—	Open source
May 15, 2025	10-Q	Form 10-Q - Quarterly report [Sections 13 or 15(d)]	—	Open source
May 15, 2025	8-K	Form 8-K - Current report - Item 2.02 Item 9.01	—	Open source
May 6, 2025	8-K	Form 8-K - Current report - Item 2.05 Item 7.01 Item 8.01 Item 9.01	—	Open source
Apr 29, 2025	DEF 14A	Form DEF 14A - Other definitive proxy statements	—	Open source
Apr 18, 2025	PRE 14A	Form PRE 14A - Other preliminary proxy statements	—	Open source
Mar 3, 2025	10-K	Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]	—	Open source
Mar 3, 2025	8-K	Form 8-K - Current report - Item 2.02 Item 7.01 Item 9.01	—	Open source
Feb 28, 2025	8-K	Form 8-K - Current report - Item 3.01	—	Open source
Feb 5, 2025	8-K	Form 8-K - Current report - Item 7.01	—	Open source
Jan 17, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 17, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 17, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 17, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 17, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 17, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 17, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 16, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 16, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 16, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 16, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 16, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 15, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 15, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 15, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 15, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 15, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 15, 2025	4	Form 4 - Statement of changes in beneficial ownership of securities	—	Open source
Jan 14, 2025	S-8	Form S-8 - Securities to be offered to employees in employee benefit plans	—	Open source
Jan 10, 2025	8-K	Form 8-K - Current report - Item 7.01	—	Open source
Jan 10, 2025	8-K	Form 8-K - Current report - Item 7.01 Item 8.01 Item 9.01	—	Open source

Filed

Form

Description

Accepted

Document

Jan 6, 2026

8-K

Form 8-K - Current report - Item 1.02 Item 2.01 Item 3.01 Item 3.03 Item 5.01 Item 5.02 Item 5.03 Item 9.01

—

Open source

Nov 14, 2025

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

—

Open source

Nov 14, 2025

8-K

Form 8-K - Current report - Item 2.02 Item 9.01

—

Open source

Nov 13, 2025

8-K

Form 8-K - Current report - Item 1.01 Item 8.01 Item 9.01

—

Open source

Oct 28, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Sep 15, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Sep 5, 2025

8-K

Form 8-K - Current report - Item 3.01

—

Open source

Aug 13, 2025

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

—

Open source

Aug 13, 2025

8-K

Form 8-K - Current report - Item 2.02 Item 9.01

—

Open source

Jul 24, 2025

8-K

Form 8-K - Current report - Item 3.03 Item 5.03 Item 9.01

—

Open source

Jul 3, 2025

8-K

Form 8-K - Current report - Item 1.02

—

Open source

Jun 13, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jun 13, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jun 13, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jun 13, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jun 13, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jun 13, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jun 13, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jun 13, 2025

8-K

Form 8-K - Current report - Item 5.07

—

Open source

Jun 2, 2025

8-K

Form 8-K - Current report - Item 7.01 Item 8.01 Item 9.01

—

Open source

May 15, 2025

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

—

Open source

May 15, 2025

8-K

Form 8-K - Current report - Item 2.02 Item 9.01

—

Open source

May 6, 2025

8-K

Form 8-K - Current report - Item 2.05 Item 7.01 Item 8.01 Item 9.01

—

Open source

Apr 29, 2025

DEF 14A

Form DEF 14A - Other definitive proxy statements

—

Open source

Apr 18, 2025

PRE 14A

Form PRE 14A - Other preliminary proxy statements

—

Open source

Mar 3, 2025

10-K

Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]

—

Open source

Mar 3, 2025

8-K

Form 8-K - Current report - Item 2.02 Item 7.01 Item 9.01

—

Open source

Feb 28, 2025

8-K

Form 8-K - Current report - Item 3.01

—

Open source

Feb 5, 2025

8-K

Form 8-K - Current report - Item 7.01

—

Open source

Jan 17, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 17, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 17, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 17, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 17, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 17, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 17, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 16, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 16, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 16, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 16, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 16, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 15, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 15, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 15, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 15, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 15, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 15, 2025

Form 4 - Statement of changes in beneficial ownership of securities

—

Open source

Jan 14, 2025

S-8

Form S-8 - Securities to be offered to employees in employee benefit plans

—

Open source

Jan 10, 2025

8-K

Form 8-K - Current report - Item 7.01

—

Open source

Jan 10, 2025

8-K

Form 8-K - Current report - Item 7.01 Item 8.01 Item 9.01

—

Open source

Mersana Therapeutics, Inc. (MRSN) Reports Material Event to SEC

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Mersana Therapeutics, Inc. (MRSN) Reports Material Event to SEC