0000950170-23-064189.txt : 20231115 0000950170-23-064189.hdr.sgml : 20231115 20231115161715 ACCESSION NUMBER: 0000950170-23-064189 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20231113 FILED AS OF DATE: 20231115 DATE AS OF CHANGE: 20231115 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Rajavelu Esther CENTRAL INDEX KEY: 0001903716 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-38266 FILM NUMBER: 231410805 MAIL ADDRESS: STREET 1: 26 LANDSDOWNE STREET 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 2023-11-13 0001701108 Spero Therapeutics, Inc. SPRO 0001903716 Rajavelu Esther C/O SPERO THERAPEUTICS, INC. 675 MASSACHUSETTS AVENUE, 14TH FLOOR CAMBRIDGE MA 02139 false true false false See Remarks false Common Stock 2023-11-13 4 A false 300000 0 A 300000 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 November 6, 2024, subject to the Reporting Person's continued service through the applicable vesting date. Chief Financial Officer and Chief Business Officer /s/ Tamara Joseph, Attorney-in-Fact for Esther Rajavelu 2023-11-15