0001104659-23-063261.txt : 20230522 0001104659-23-063261.hdr.sgml : 20230522 20230522184913 ACCESSION NUMBER: 0001104659-23-063261 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20230518 FILED AS OF DATE: 20230522 DATE AS OF CHANGE: 20230522 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: PETERS WILLIAM J CENTRAL INDEX KEY: 0001263136 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-36509 FILM NUMBER: 23946087 MAIL ADDRESS: STREET 1: C/O AMPHASTAR PHARMACEUTICALS, INC. STREET 2: 11570 6TH STREET CITY: RANCHO CUCAMONGA STATE: CA ZIP: 91730 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: Amphastar Pharmaceuticals, Inc. CENTRAL INDEX KEY: 0001297184 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] IRS NUMBER: 330702205 FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 11570 SIXTH STREET CITY: RANCHO CUCAMONGA STATE: CA ZIP: 91730 BUSINESS PHONE: 909-980-9484 MAIL ADDRESS: STREET 1: 11570 SIXTH STREET CITY: RANCHO CUCAMONGA STATE: CA ZIP: 91730 4 1 tm2315996-5_4seq1.xml OWNERSHIP DOCUMENT X0407 4 2023-05-18 0 0001297184 Amphastar Pharmaceuticals, Inc. AMPH 0001263136 PETERS WILLIAM J C/O AMPHASTAR PHARMACEUTICALS, INC. 11570 6TH STREET RANCHO CUCAMONGA CA 91730 1 1 0 0 CFO, EVP & Treasurer 1 Common Stock 2023-05-18 4 M 0 10500 13.35 A 115648 D Common Stock 2023-05-18 4 S 0 10500 44.35 D 105148 D Common Stock 2023-05-19 4 F 0 378 44.16 D 104770 D Employee Stock Option (right to buy) 13.35 2023-05-18 4 M 0 10500 0 D 2027-03-16 Common Stock 10500 18490 D The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2022. The reported shares were withheld to satisfy the reporting person's tax liability in connection with the vesting of restricted stock units, or RSUs. Shares subject to the option are fully vested and immediately exercisable. /s/ William J. Peters 2023-05-22