0000950170-23-052693.txt : 20231010 0000950170-23-052693.hdr.sgml : 20231010 20231010171944 ACCESSION NUMBER: 0000950170-23-052693 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20231005 FILED AS OF DATE: 20231010 DATE AS OF CHANGE: 20231010 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Jackson Scott Thomas CENTRAL INDEX KEY: 0001566617 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-38266 FILM NUMBER: 231318787 MAIL ADDRESS: STREET 1: 303B COLLEGE ROAD EAST CITY: PRINCETON STATE: NJ ZIP: 08540 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: Spero Therapeutics, Inc. CENTRAL INDEX KEY: 0001701108 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] IRS NUMBER: 000000000 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 675 MASSACHUSETTS AVENUE STREET 2: 14TH FLOOR CITY: CAMBRIDGE STATE: MA ZIP: 02139 BUSINESS PHONE: 857-242-1600 MAIL ADDRESS: STREET 1: 675 MASSACHUSETTS AVENUE STREET 2: 14TH FLOOR CITY: CAMBRIDGE STATE: MA ZIP: 02139 FORMER COMPANY: FORMER CONFORMED NAME: Spero Therapeutics, LLC DATE OF NAME CHANGE: 20170316 4 1 ownership.xml 4 X0508 4 2023-10-05 0001701108 Spero Therapeutics, Inc. SPRO 0001566617 Jackson Scott Thomas C/O SPERO THERAPEUTICS, INC. 675 MASSACHUSETTS AVENUE, 14TH FLOOR CAMBRIDGE MA 02139 true false false false false Common Stock 2023-10-05 4 A false 20000 0.00 A 35000 D Consists of restricted stock units ("RSUs"). Each RSU represents the right to receive one share of common stock upon vesting. The RSUs vest on October 5, 2024, subject to the Reporting Person's continued service through the applicable vesting date. /s/ Tamara Joseph, Attorney-in-Fact for Scott Thomas Jackson 2023-10-10