Form 4 - Statement of changes in beneficial ownership of securities:
SEC Accession No. 0001104659-26-001385
Filing Date
2026-01-06
Accepted
2026-01-06 16:54:24
Documents
1
Period of Report
2026-01-06

Document Format Files

Seq Description Document Type Size
1 OWNERSHIP DOCUMENT tm261736-11_4seq1.html 4  
1 OWNERSHIP DOCUMENT tm261736-11_4seq1.xml 4 19125
  Complete submission text file 0001104659-26-001385.txt   20661
Mailing Address 840 MEMORIAL DRIVE CAMBRIDGE MA 02139
Business Address 840 MEMORIAL DRIVE CAMBRIDGE MA 02139 617-498-0020
Mersana Therapeutics, Inc. (Issuer) CIK: 0001442836 (see all company filings)

EIN.: 000000000 | State of Incorp.: DE | Fiscal Year End: 1231
SIC: 2834 Pharmaceutical Preparations
(CF Office: 03 Life Sciences)

Mailing Address C/O IONIS PHARMACEUTICALS, INC. 2855 GAZELLE COURT CARLSBAD CA 92010
Business Address
Diaz Allene M. (Reporting) CIK: 0001773314 (see all company filings)

Type: 4 | Act: 34 | File No.: 001-38129 | Film No.: 26512494