0001209191-23-048162.txt : 20230905 0001209191-23-048162.hdr.sgml : 20230905 20230905163000 ACCESSION NUMBER: 0001209191-23-048162 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20230901 FILED AS OF DATE: 20230905 DATE AS OF CHANGE: 20230905 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Mason Michael CENTRAL INDEX KEY: 0001514291 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-36167 FILM NUMBER: 231236180 MAIL ADDRESS: STREET 1: 300 3RD STREET CITY: CAMBRIDGE STATE: MA ZIP: 02142 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: Karyopharm Therapeutics Inc. CENTRAL INDEX KEY: 0001503802 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] IRS NUMBER: 263931704 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 85 WELLS AVENUE STREET 2: SECOND FLOOR CITY: NEWTON STATE: MA ZIP: 02459 BUSINESS PHONE: 617-658-0600 MAIL ADDRESS: STREET 1: 85 WELLS AVENUE STREET 2: SECOND FLOOR CITY: NEWTON STATE: MA ZIP: 02459 4 1 doc4.xml FORM 4 SUBMISSION X0508 4 2023-09-01 0 0001503802 Karyopharm Therapeutics Inc. KPTI 0001514291 Mason Michael C/O KARYOPHARM THERAPEUTICS INC. 85 WELLS AVENUE NEWTON MA 02459 0 1 0 0 EVP, CFO & Treasurer 0 Common Stock 2023-09-01 4 S 0 6913 1.3313 D 237817 D This transaction was effected pursuant to a durable automatic sale instruction plan adopted by the reporting person on June 10, 2021, and represents a broker-assisted sale of shares to satisfy the payment of withholding tax liability incurred upon the vesting of restricted stock units. The sale does not represent a discretionary trade by the reporting person. /s/Nancy Smith as Attorney-in-Fact for Michael Mason 2023-09-05