0000935836-23-000535.txt : 20230731
0000935836-23-000535.hdr.sgml : 20230731
20230731135545
ACCESSION NUMBER: 0000935836-23-000535
CONFORMED SUBMISSION TYPE: 3
PUBLIC DOCUMENT COUNT: 1
CONFORMED PERIOD OF REPORT: 20230727
FILED AS OF DATE: 20230731
DATE AS OF CHANGE: 20230731
REPORTING-OWNER:
OWNER DATA:
COMPANY CONFORMED NAME: EcoR1 Capital, LLC
CENTRAL INDEX KEY: 0001587114
STATE OF INCORPORATION: DE
FISCAL YEAR END: 1231
FILING VALUES:
FORM TYPE: 3
SEC ACT: 1934 Act
SEC FILE NUMBER: 001-38129
FILM NUMBER: 231126454
BUSINESS ADDRESS:
STREET 1: 357 TEHAMA STREET #3
CITY: SAN FRANCISCO
STATE: CA
ZIP: 94103
BUSINESS PHONE: 415-448-6534
MAIL ADDRESS:
STREET 1: 357 TEHAMA STREET #3
CITY: SAN FRANCISCO
STATE: CA
ZIP: 94103
ISSUER:
COMPANY DATA:
COMPANY CONFORMED NAME: Mersana Therapeutics, Inc.
CENTRAL INDEX KEY: 0001442836
STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834]
IRS NUMBER: 000000000
STATE OF INCORPORATION: DE
FISCAL YEAR END: 1231
BUSINESS ADDRESS:
STREET 1: 840 MEMORIAL DRIVE
CITY: CAMBRIDGE
STATE: MA
ZIP: 02139
BUSINESS PHONE: 617-498-0020
MAIL ADDRESS:
STREET 1: 840 MEMORIAL DRIVE
CITY: CAMBRIDGE
STATE: MA
ZIP: 02139
FORMER COMPANY:
FORMER CONFORMED NAME: MERSANA THERAPEUTICS INC
DATE OF NAME CHANGE: 20080813
3
1
ownership.xml
X0206
3
2023-07-27
0
0001442836
Mersana Therapeutics, Inc.
MRSN
0001587114
EcoR1 Capital, LLC
357 TEHAMA STREET #3
SAN FRANCISCO
CA
94103
0
0
1
0
Common Stock
19364688
I
See Notes 1 and 2
The filing persons (the "Filers") are EcoR1 Capital, LLC ("EcoR1"), Oleg Nodelman, and EcoR1 Capital Fund Qualified, L.P. ("Qualified Fund"). EcoR1 is the general partner and investment adviser of private funds, including Qualified Fund (collectively, the "Funds"). Mr. Nodelman is the manager and controlling owner of EcoR1. EcoR1 is filing this Form 3 for itself, Mr. Nodelman and Qualified Fund. The Filers are filing this Form 3 jointly, but not as a group, and each expressly disclaims membership in a group within the meaning of Rule 13d-5(b) under the Securities Exchange Act of 1934. The Funds hold these securities directly for the benefit of their investors. EcoR1 may be deemed to indirectly beneficially own them as the investment adviser to the Funds. Mr. Nodelman may be deemed to indirectly beneficially own them as the control person of EcoR1. The Filers disclaim beneficial ownership of the securities except to the extent of their respective pecuniary interests therein.
Qualified Fund directly holds 18,260,899 of the shares of Common Stock reported in this Form 3.
/s/ Oleg Nodelman
2023-07-28