0000950170-23-045450.txt : 20230830 0000950170-23-045450.hdr.sgml : 20230830 20230830162333 ACCESSION NUMBER: 0000950170-23-045450 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20230828 FILED AS OF DATE: 20230830 DATE AS OF CHANGE: 20230830 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Keutzer Timothy CENTRAL INDEX KEY: 0001798155 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-38266 FILM NUMBER: 231225532 MAIL ADDRESS: STREET 1: C/O SPERO THERAPEUTICS, INC. STREET 2: 675 MASSACHUSETTS AVENUE, 14TH FLOOR CITY: CAMBRIDGE STATE: MA ZIP: 02139 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 2023-08-28 0001701108 Spero Therapeutics, Inc. SPRO 0001798155 Keutzer Timothy C/O SPERO THERAPEUTICS, INC. 675 MASSACHUSETTS AVENUE, 14TH FLOOR CAMBRIDGE MA 02139 false true false false Chief Development Officer false Common Stock 2023-08-28 4 S false 1854 1.26 D 325290 D The reported transaction is a sale of common stock effected to cover tax withholding obligations in connection with the vesting of restricted stock units ("RSUs") that were granted to the Reporting Person on August 26, 2021 pursuant to a "sell to cover" provision included in the RSU Agreement. /s/ Tamara Joseph, Attorney-in-Fact for Timothy Keutzer 2023-08-30