Mersana Therapeutics, Inc.
Pharmaceutical Preparations · CAMBRIDGE · MA
Moderate confidence (50%)
Updated Oct 19, 2026, 12:04 AM
What is happening
Derived by rule set status-rules-2026.09.7
An exchange warned the company it no longer meets the listing standards. Companies regain compliance often.
Latest material event: Mersana Therapeutics, Inc. deregistered its securities (Jan 16, 2026)
Timeline
Every material event, newest first. History is never overwritten.
Mersana Therapeutics, Inc. deregistered its securities
Jan 16, 2026
Registration withdrawn
- SEC EDGAR — “15-12G 1 tm263425d1_1512g.htm 15-12G UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File Number: 001-38129 Mersana Therapeutics, Inc. (Exact name of registrant as specified in its charter) 840 Memorial Drive Cambridge, Massachusetts 02139 Telephone: (617) 498-0020 (Address, including zip code, and telephone number, including area cod…”
Mersana Therapeutics, Inc. was delisted from its exchange
Jan 6, 2026
Delisting effective
- SEC EDGAR — “X0203 0001354457 Nasdaq Stock Market LLC 0001442836 Mersana Therapeutics, Inc. 001-38129 840 Memorial Drive Cambridge MA MASSACHUSETTS 02139 617-715-8233 common stock 17 CFR 240.12d2-2(a)(3) Tara Petta AVP 2026-01-06”
Mersana Therapeutics, Inc. received a delisting notice from its exchange
Jan 5, 2026
Delisting notice received
- SEC EDGAR — “Item 3.01. Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing. On January 5, 2026, the Company (i) notified Nasdaq of the anticipated consummation of the Merger and (ii) requested that Nasdaq suspend trading of the Common Stock, effective as of 8:00 p.m., Eastern Time, on January 5, 2026, and, following the Effective Time, file with the SEC a Form 25, Notification of Removal from Listing and/or Registration, to delist all the Common Stock from Nasdaq and deregister the Common Stock under Section 12(b) of the Securities Exchange Act of 1934, as a…”
Company information
- Founded
- —
- Employees (estimate)
- —
- Industry
- Pharmaceutical Preparations
- Subindustry
- —
- SEC CIK
- 0001442836
- Website
- —
- —
- Headquarters
- CAMBRIDGE, MA
- Also known as
- MERSANA THERAPEUTICS INC
- Legal entities
- Mersana Therapeutics, Inc.
Sources
Every material source used to build this profile.
SEC Company Submissions (TIER 1 · UNVERIFIED)
Mersana Therapeutics, Inc. — Pharmaceutical Preparations (SIC 2834) — CAMBRIDGE, MA
View source recordSEC EDGAR (TIER 1 · UNVERIFIED)
15-12G 1 tm263425d1_1512g.htm 15-12G UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File Number: 001-38129 Mersana Therapeutics, Inc. (Exact name of registrant as specified in its charter) 840 Memorial Drive Cambridge, Massachusetts 02139 Telephone: (617) 498-0020 (Address, including zip code, and telephone number, including area cod…
View source recordSEC EDGAR (TIER 1 · UNVERIFIED)
X0203 0001354457 Nasdaq Stock Market LLC 0001442836 Mersana Therapeutics, Inc. 001-38129 840 Memorial Drive Cambridge MA MASSACHUSETTS 02139 617-715-8233 common stock 17 CFR 240.12d2-2(a)(3) Tara Petta AVP 2026-01-06
View source recordSEC EDGAR (TIER 1 · UNVERIFIED)
Item 3.01. Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing. On January 5, 2026, the Company (i) notified Nasdaq of the anticipated consummation of the Merger and (ii) requested that Nasdaq suspend trading of the Common Stock, effective as of 8:00 p.m., Eastern Time, on January 5, 2026, and, following the Effective Time, file with the SEC a Form 25, Notification of Removal from Listing and/or Registration, to delist all the Common Stock from Nasdaq and deregister the Common Stock under Section 12(b) of the Securities Exchange Act of 1934, as a…
View source record
Status history
Every derived status, with the rule that produced it.
- DISTRESS_SIGNAL → DISTRESS_SIGNALLISTING_STANDARDS_WARNING · Sep 18, 2026, 01:31 AM
An exchange warned the company it no longer meets the listing standards. Companies regain compliance often.
- DISTRESS_SIGNAL → DISTRESS_SIGNALLISTING_STANDARDS_WARNING · Sep 18, 2026, 01:13 AM
An exchange warned the company it no longer meets the listing standards. Companies regain compliance often.
- DISTRESS_SIGNAL → DISTRESS_SIGNALPUBLIC_LISTING_ENDED · Sep 15, 2026, 12:35 PM
The company stopped being publicly listed. That happens to failing companies and to acquired ones alike.
- DISTRESS_SIGNAL → DISTRESS_SIGNALPUBLIC_LISTING_ENDED · Sep 13, 2026, 12:04 AM
The company stopped being publicly listed. That happens to failing companies and to acquired ones alike.
- DISTRESS_SIGNAL → DISTRESS_SIGNALPUBLIC_LISTING_ENDED · Sep 8, 2026, 03:54 AM
The company stopped being publicly listed. That happens to failing companies and to acquired ones alike.
- UNKNOWN → DISTRESS_SIGNALPUBLIC_LISTING_ENDED · Sep 8, 2026, 03:54 AM
An exchange warned the company it no longer meets the listing standards. Companies regain compliance often.