---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-087800"
form_type: "8-K"
ticker: null
cik: "0001442836"
company_name: "Mersana Therapeutics, Inc."
filed_at: "2025-09-05T23:59:59+00:00"
generated_at: "2026-05-17T07:56:21.215593+00:00"
event_type: "regulatory"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Mersana receives Nasdaq deficiency notice for MVLS below $50M

## Summary
- Notice received September 5, 2025; MRSN must regain compliance by March 4, 2026.
- Company's MVLS must close at $50M or more for 10 consecutive business days.
- If not compliant by deadline, Nasdaq will issue delisting notice; company can appeal.
- Stock continues trading on Nasdaq Global Select Market under symbol MRSN.

## SEC filing metadata
- accession: 0001104659-25-087800
- form_type: 8-K
- cik: 0001442836
- company_name: Mersana Therapeutics, Inc.
- filed_at: 2025-09-05T23:59:59+00:00
- event_type: regulatory
- sentiment: negative
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 3.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1442836/000110465925087800/0001104659-25-087800-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1442836/000110465925087800/tm2525355d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-087800
- JSON: https://secwatch.observer/filing/0001104659-25-087800.json
- Plain text: https://secwatch.observer/filing/0001104659-25-087800.txt

## Key facts
- Listing & Compliance Notices
  Mersana Therapeutics, Inc. received a nasdaq deficiency notice notice regarding market value (rules 5450(b)(2)(A)).
  - Exchange: nasdaq
  - Notice: deficiency notice
  - Deficiency: market value
  - Rules: 5450(b)(2)(A)
  source text: September 5, 2025, Mersana Therapeutics, Inc. (the “Company”) received written notice (the “Notice”) from the Listing Qualifications Department of The Nasdaq Stock Market LLC (“Nasdaq”) notifying the Company that the Company is not in compliance with Nasdaq Listing Rule 5450(b)(2)(A) (the “MVLS Rule”), which requires the Company to maintain a minimum Market Value of Listed Securities (“MVLS”) of $50.0 million. The Notice is only a notification of deficiency, not of imminent delisting, and has no current effect on the listing of the Company’s common stock, which continues to trade on The Nasdaq
  evidence_url: https://www.sec.gov/Archives/edgar/data/1442836/000110465925087800/0001104659-25-087800-index.htm

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