---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-24-028715"
form_type: "8-K"
ticker: null
cik: "0001442836"
company_name: "Mersana Therapeutics, Inc."
filed_at: "2024-02-28T23:59:59+00:00"
generated_at: "2026-06-05T08:35:41.974871+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Mersana Therapeutics enters $100M ATM sales agreement with TD Cowen

## Summary
- Company entered Sales Agreement to sell up to $100M of common stock at-the-market through TD Cowen.
- TD Cowen will receive up to 3.0% commission per share sold; no minimum obligation to sell shares.
- Offering is under existing S-3 registration statement that became effective February 28, 2024.
- Company may suspend or terminate the offering at any time upon notice to TD Cowen.

## SEC filing metadata
- accession: 0001104659-24-028715
- form_type: 8-K
- cik: 0001442836
- company_name: Mersana Therapeutics, Inc.
- filed_at: 2024-02-28T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1442836/000110465924028715/0001104659-24-028715-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1442836/000110465924028715/tm247340d5_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-24-028715
- JSON: https://secwatch.observer/filing/0001104659-24-028715.json
- Plain text: https://secwatch.observer/filing/0001104659-24-028715.txt

## Key facts
- Material Agreements
  Mersana Therapeutics, Inc. entered into Sales Agreement with Cowen and Company, LLC valued at up to $100,000,000 (effective 2024-02-28).
  - Action: entry
  - Agreement: atm program
  - Counterparty: Cowen and Company, LLC
  - Value: up to $100,000,000
  - Effective: 2024-02-28
  source text: On February 28, 2024, Mersana Therapeutics, Inc., a Delaware corporation (the “Company”), entered into a Sales Agreement (the “Sales Agreement”) with Cowen and Company, LLC as agent (“TD Cowen”) pursuant to which the Company may issue and sell shares of its common stock, $0.0001 par value per share, having an aggregate offering price of up to $100,000,000
  evidence_url: https://www.sec.gov/Archives/edgar/data/1442836/000110465924028715/0001104659-24-028715-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.