0000950170-24-023292.txt : 20240229 0000950170-24-023292.hdr.sgml : 20240229 20240229173554 ACCESSION NUMBER: 0000950170-24-023292 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20240227 FILED AS OF DATE: 20240229 DATE AS OF CHANGE: 20240229 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: 24705418 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 2024-02-27 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 2024-02-27 4 S false 2545 1.3238 D 244400 D Common Stock 2024-02-28 4 A false 188205 0.0 A 432605 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 ("RSUs"). The sale does not represent a discretionary trade by the reporting person. Represents the award of RSUs pursuant to the Karyopharm Therapeutics Inc. 2022 Equity Incentive Plan, as amended. RSUs convert into Karyopharm Therapeutics Inc. common stock on a one-for-one basis. The RSUs vest in three equal annual installments beginning February 28, 2025. /s/Nancy Smith as Attorney-in-Fact for Michael Mason 2024-02-29