0000950170-23-027005.txt : 20230608 0000950170-23-027005.hdr.sgml : 20230608 20230608160811 ACCESSION NUMBER: 0000950170-23-027005 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20230606 FILED AS OF DATE: 20230608 DATE AS OF CHANGE: 20230608 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Nielsen Ulrik B. CENTRAL INDEX KEY: 0001531962 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-35409 FILM NUMBER: 231001964 MAIL ADDRESS: STREET 1: MERRIMACK PHARMACEUTICALS, INC. STREET 2: ONE KENDALL SQUARE, SUITE B7201 CITY: CAMBRIDGE STATE: MA ZIP: 02139 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: MERRIMACK PHARMACEUTICALS INC CENTRAL INDEX KEY: 0001274792 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] IRS NUMBER: 000000000 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: ONE BROADWAY STREET 2: 14TH FLOOR CITY: CAMBRIDGE STATE: MA ZIP: 02142 BUSINESS PHONE: 617-441-1000 MAIL ADDRESS: STREET 1: ONE BROADWAY STREET 2: 14TH FLOOR CITY: CAMBRIDGE STATE: MA ZIP: 02142 4 1 ownership.xml 4 X0407 4 2023-06-06 0001274792 MERRIMACK PHARMACEUTICALS INC MACK 0001531962 Nielsen Ulrik B. C/O MERRIMACK PHARMACEUTICALS, INC. ONE BROADWAY 14TH FLOOR CAMBRIDGE MA 02142 true false false false false Stock Option (right to buy) 12.48 2023-06-06 4 A false 7000 0 A 2033-06-05 Common Stock 7000 28000 D This option vests as to 1/4th of the total number of shares on 7/1/23 and an additional 1/4th of the total number of shares at the end of each successive three month period thereafter until 4/1/24. /s/ Ulrik B. Nielsen 2023-06-08