Company · CIK 1442836 # Mersana Therapeutics, Inc. | CIK | [1442836](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001442836) (SEC EDGAR) | | --- | --- | | Industry (SIC) | 2834 — Pharmaceutical Preparations | | Incorporated in | DE | | Business address | MA | | Listed | no ticker on SEC record today | | First annual or quarterly report | 2017-08-11 | ## Offerings 5 registrations | Registration | Label and status | First filed | Last event | Filings | | --- | --- | --- | --- | --- | | 333-271766 | Shelf Effective | 2023-05-09 | 2026-01-08 | 5 | | 333-260895 | Shelf Effective | 2021-11-09 | 2022-11-07 | 4 | | 333-238140 | Shelf Effective | 2020-05-08 | 2020-05-29 | 4 | | 333-226055 | Shelf Effective | 2018-07-02 | 2020-04-09 | 5 | | 333-218412 | IPO Final prospectus | 2017-06-01 | 2017-06-29 | 4 | ## Filings 23 | Filed | Filing | Registration | Accession | | --- | --- | --- | --- | | 2026-01-08 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1442836/999999999526000105/9999999995-26-000105-index.htm) Declared effective | 333-271766 | 9999999995-26-000105 | | 2024-05-09 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1442836/999999999524001443/9999999995-24-001443-index.htm) Declared effective | 333-271766 | 9999999995-24-001443 | | 2024-05-09 | [424B5](https://www.sec.gov/Archives/edgar/data/1442836/000110465924059428/0001104659-24-059428-index.htm) Shelf takedown | 333-271766 | 0001104659-24-059428 | | 2024-02-28 | [424B5](https://www.sec.gov/Archives/edgar/data/1442836/000110465924028709/0001104659-24-028709-index.htm) Shelf takedown | 333-271766 | 0001104659-24-028709 | | 2023-05-09 | [S-3ASR](https://www.sec.gov/Archives/edgar/data/1442836/000110465923057729/0001104659-23-057729-index.htm) Shelf registered | 333-271766 | 0001104659-23-057729 | | 2022-11-07 | [424B5](https://www.sec.gov/Archives/edgar/data/1442836/000110465922115404/0001104659-22-115404-index.htm) Shelf takedown | 333-260895 | 0001104659-22-115404 | | 2022-02-28 | [424B5](https://www.sec.gov/Archives/edgar/data/1442836/000110465922028170/0001104659-22-028170-index.htm) Shelf takedown | 333-260895 | 0001104659-22-028170 | | 2021-11-18 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1442836/999999999521004406/9999999995-21-004406-index.htm) Declared effective | 333-260895 | 9999999995-21-004406 | | 2021-11-09 | [S-3](https://www.sec.gov/Archives/edgar/data/1442836/000110465921136061/0001104659-21-136061-index.htm) Shelf registered | 333-260895 | 0001104659-21-136061 | | 2020-05-29 | [424B5](https://www.sec.gov/Archives/edgar/data/1442836/000104746920003268/0001047469-20-003268-index.htm) Shelf takedown | 333-238140 | 0001047469-20-003268 | | 2020-05-28 | [424B5](https://www.sec.gov/Archives/edgar/data/1442836/000104746920003225/0001047469-20-003225-index.htm) Shelf takedown | 333-238140 | 0001047469-20-003225 | | 2020-05-15 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1442836/999999999520001176/9999999995-20-001176-index.htm) Declared effective | 333-238140 | 9999999995-20-001176 | | 2020-05-08 | [S-3](https://www.sec.gov/Archives/edgar/data/1442836/000104746920002929/0001047469-20-002929-index.htm) Shelf registered | 333-238140 | 0001047469-20-002929 | | 2020-04-09 | [424B5](https://www.sec.gov/Archives/edgar/data/1442836/000104746920002216/0001047469-20-002216-index.htm) Shelf takedown | 333-226055 | 0001047469-20-002216 | | 2019-03-04 | [424B5](https://www.sec.gov/Archives/edgar/data/1442836/000104746919000878/0001047469-19-000878-index.htm) Shelf takedown | 333-226055 | 0001047469-19-000878 | | 2019-02-28 | [424B5](https://www.sec.gov/Archives/edgar/data/1442836/000104746919000794/0001047469-19-000794-index.htm) Shelf takedown | 333-226055 | 0001047469-19-000794 | | 2018-09-17 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1442836/999999999518002388/9999999995-18-002388-index.htm) Declared effective | 333-226055 | 9999999995-18-002388 | | 2018-07-02 | [S-3](https://www.sec.gov/Archives/edgar/data/1442836/000104746918004853/0001047469-18-004853-index.htm) Shelf registered | 333-226055 | 0001047469-18-004853 | | 2017-06-29 | [424B4](https://www.sec.gov/Archives/edgar/data/1442836/000104746917004333/0001047469-17-004333-index.htm) Final prospectus | 333-218412 | 0001047469-17-004333 | | 2017-06-27 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1442836/999999999517001673/9999999995-17-001673-index.htm) Declared effective | 333-218412 | 9999999995-17-001673 | | 2017-06-16 | [S-1/A](https://www.sec.gov/Archives/edgar/data/1442836/000104746917004050/0001047469-17-004050-index.htm) Amendment | 333-218412 | 0001047469-17-004050 | | 2017-06-01 | [S-1](https://www.sec.gov/Archives/edgar/data/1442836/000104746917003762/0001047469-17-003762-index.htm) Registration filed | 333-218412 | 0001047469-17-003762 | | 2017-03-17 | [DRS](https://www.sec.gov/Archives/edgar/data/1442836/000091205717000067/0000912057-17-000067-index.htm) Draft made public | 377-01519 | 0000912057-17-000067 | [All filings of this company](https://equitycapital.markets/filings?cik=1442836) · [CSV](https://equitycapital.markets/filings.csv?cik=1442836) --- Source page: https://equitycapital.markets/company/1442836 · Data: U.S. SEC EDGAR · CC BY 4.0