Mersana Therapeutics, Inc. — Investor Relations & Filings
Filings indexed
700
across all filing types
Latest filing
2026-02-17
Major Shareholding Noti…
Country
US
United States of America
Listing
US
MRSN
Mersana Therapeutics, Inc. is a clinical-stage company focused on discovering and developing life-changing antibody-drug conjugates (ADCs) for patients fighting cancer. The company utilizes its proprietary and differentiated ADC platforms, which incorporate both cytotoxic and immunostimulatory payloads, to develop its pipeline. These platforms are designed to customize and optimize ADCs, aiming to overcome the limitations of first-generation technologies by improving efficacy and tolerability. Mersana is advancing a portfolio of ADC candidates to address unmet medical needs in oncology.
Recent filings
| Filing | Released | Lang | Actions |
|---|---|---|---|
| SCHEDULE 13G/A Filing | 2026-02-17 | English | |
| SCHEDULE 13G/A Filing | 2026-02-17 | English | |
| SCHEDULE 13G/A Filing | 2026-01-30 | English | |
| SCHEDULE 13G/A Filing | 2026-01-09 | English | |
| SCHEDULE 13D/A Filing | 2026-01-08 | English | |
| 4 | 2026-01-07 | English |
Browse filings by year
19 years| ID | Filing | Released | Lang | Actions | |
|---|---|---|---|---|---|
|
2026
15 filings
| |||||
| 29846000 | SCHEDULE 13G/A Filing | 2026-02-17 | English | ||
| 29845995 | SCHEDULE 13G/A Filing | 2026-02-17 | English | ||
| 29846067 | SCHEDULE 13G/A Filing | 2026-01-30 | English | ||
| 29846026 | SCHEDULE 13G/A Filing | 2026-01-09 | English | ||
| 29845976 | SCHEDULE 13D/A Filing | 2026-01-08 | English | ||
| 12246690 | 4 | 2026-01-07 | English | ||
| 12246691 | OWNERSHIP DOCUMENT | 2026-01-06 | English | ||
| 12246692 | OWNERSHIP DOCUMENT | 2026-01-06 | English | ||
| 12246693 | OWNERSHIP DOCUMENT | 2026-01-06 | English | ||
| 12246694 | OWNERSHIP DOCUMENT | 2026-01-06 | English | ||
| 12246695 | OWNERSHIP DOCUMENT | 2026-01-06 | English | ||
| 12246696 | OWNERSHIP DOCUMENT | 2026-01-06 | English | ||
| 12246697 | OWNERSHIP DOCUMENT | 2026-01-06 | English | ||
| 12246698 | OWNERSHIP DOCUMENT | 2026-01-06 | English | ||
| 12246699 | OWNERSHIP DOCUMENT | 2026-01-06 | English | ||
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Mersana Therapeutics, Inc. via the API
Pull this company's filings, identifiers, and metadata as JSON or Markdown. Authenticate with your API key, then query by company ID, ISIN, or LEI. Full schema documented in the OpenAPI spec.
Endpoints
| GET | /api/companies/34702/ | Company identity, sector, listing, identifiers |
| GET | /api/filings/?company=34702 | Paginated list of all filings (filterable by type, date, language) |
| GET | /api/filings/{id}/ | Single filing — metadata, document URL, processing status |
| GET | /api/filings/{id}/markdown/ | Filing content as Markdown (PDF → text/tables/figures) |
| GET | /api/isins/?company=34702 | All ISINs registered to this company |
| GET | /api/filing-types/ | Reference: every filing-type code + category |
Full reference: API reference · OpenAPI schema
cURL
$ curl https://api.financialreports.eu/api/filings/?company=34702 \ -H "x-api-key: $FR_API_KEY" \ -H "Accept: application/json"
Python
import requests r = requests.get( "https://api.financialreports.eu/api/filings/", params={"company": 34702}, headers={"x-api-key": API_KEY}, ) filings = r.json()["results"]
MCP server
// MCP server URL https://mcp.financialfilings.com/mcp // Once connected, the LLM can query this company directly: "Pull the latest 5 filings for Mersana Therapeutics, Inc. (id: 34702)"
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