0000950170-24-011501.txt : 20240205 0000950170-24-011501.hdr.sgml : 20240205 20240205205334 ACCESSION NUMBER: 0000950170-24-011501 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20240201 FILED AS OF DATE: 20240205 DATE AS OF CHANGE: 20240205 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Keutzer Timothy CENTRAL INDEX KEY: 0001798155 ORGANIZATION NAME: FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-38266 FILM NUMBER: 24597785 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] ORGANIZATION NAME: 03 Life Sciences 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 2024-02-01 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 Operating Officer false Common Stock 2024-02-01 4 A false 239731 0 A 565021 D Common Stock 2024-02-02 4 S false 30971 1.36 D 534050 D Consists of restricted stock units ("RSUs"). Each RSU represents the right to receive one share of common stock upon vesting. The RSUs vest in four equal annual installments beginning on February 1, 2025, subject to the Reporting Person's continued service through the applicable vesting date. The reported transaction is a sale of common stock effected to cover tax withholding obligations in connection with the vesting of RSUs that were granted to the Reporting Person on February 1, 2022 and February 1, 2023 pursuant to a "sell to cover" provision included in each RSU Agreement. Represents the weighted average sales price per share. The shares sold at prices ranging from $1.36 to $1.42 per share. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer. /s/ Tamara Joseph, Attorney-in-Fact for Timothy Keutzer 2024-02-05