0000950170-24-012832.txt : 20240208 0000950170-24-012832.hdr.sgml : 20240208 20240208163616 ACCESSION NUMBER: 0000950170-24-012832 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20240206 FILED AS OF DATE: 20240208 DATE AS OF CHANGE: 20240208 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Mason Michael CENTRAL INDEX KEY: 0001514291 ORGANIZATION NAME: FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-36167 FILM NUMBER: 24609670 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] ORGANIZATION NAME: 03 Life Sciences 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 ownership.xml 4 X0508 4 2024-02-06 0001503802 Karyopharm Therapeutics Inc. KPTI 0001514291 Mason Michael C/O KARYOPHARM THERAPEUTICS INC. 85 WELLS AVENUE NEWTON MA 02459 false true false false EVP, CFO & Treasurer false Common Stock 2024-02-06 4 S false 4205 1.5865 D 246945 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 2024-02-08