---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-019146"
form_type: "8-K"
ticker: null
cik: "0001442836"
company_name: "Mersana Therapeutics, Inc."
filed_at: "2025-02-28T23:59:59+00:00"
generated_at: "2026-05-25T22:56:45.370656+00:00"
event_type: "regulatory"
sentiment: "negative"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Mersana Therapeutics receives Nasdaq delisting notice for bid price non-compliance

## Summary
- Notice on Feb 25, 2025 for failure to maintain $1.00 minimum bid for 30 consecutive business days.
- Company has 180 days (until Aug 25, 2025) to regain compliance by closing bid >=$1.00 for 10 consecutive days.
- If not compliant, may get second 180-day period by moving to Nasdaq Capital Market and considering reverse stock split.
- No immediate effect on listing or trading of MRSN common stock.

## SEC filing metadata
- accession: 0001104659-25-019146
- form_type: 8-K
- cik: 0001442836
- company_name: Mersana Therapeutics, Inc.
- filed_at: 2025-02-28T23:59:59+00:00
- event_type: regulatory
- sentiment: negative
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 3.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1442836/000110465925019146/0001104659-25-019146-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1442836/000110465925019146/tm257819d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-019146
- JSON: https://secwatch.observer/filing/0001104659-25-019146.json
- Plain text: https://secwatch.observer/filing/0001104659-25-019146.txt

## Key facts
- Listing & Compliance Notices
  Mersana Therapeutics, Inc. received a nasdaq deficiency notice notice regarding minimum bid price (rules 5450(a)(1)).
  - Exchange: nasdaq
  - Notice: deficiency notice
  - Deficiency: minimum bid price
  - Rules: 5450(a)(1)
  source text: February 25, 2025, Mersana Therapeutics, Inc. (the “Company”) received written notice (the “Notice”) from the Listing Qualifications Department of The Nasdaq Stock Market LLC (“Nasdaq”) stating that the Company is not in compliance with Nasdaq Listing Rule 5450(a)(1) because the Company has not maintained a minimum closing bid price of the Company’s common stock of at least $1.00 per share for the last 30 consecutive business days (the “Minimum Bid Price Requirement”). The Notice has no immediate effect on the listing or trading of the Company’s common stock on Nasdaq. In accordance with Nasda
  evidence_url: https://www.sec.gov/Archives/edgar/data/1442836/000110465925019146/0001104659-25-019146-index.htm

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