0001209191-20-042320.txt : 20200713 0001209191-20-042320.hdr.sgml : 20200713 20200713190553 ACCESSION NUMBER: 0001209191-20-042320 CONFORMED SUBMISSION TYPE: 3 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20200629 FILED AS OF DATE: 20200713 DATE AS OF CHANGE: 20200713 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Atlas Venture Opportunity Fund I, L.P. CENTRAL INDEX KEY: 0001759241 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 3 SEC ACT: 1934 Act SEC FILE NUMBER: 001-38541 FILM NUMBER: 201026064 BUSINESS ADDRESS: STREET 1: 400 TECHNOLOGY SQUARE, 10TH FLOOR CITY: CAMBRIDGE STATE: MA ZIP: 02139 BUSINESS PHONE: 857-201-2700 MAIL ADDRESS: STREET 1: 400 TECHNOLOGY SQUARE, 10TH FLOOR CITY: CAMBRIDGE STATE: MA ZIP: 02139 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Atlas Venture Associates Opportunity I, L.P. CENTRAL INDEX KEY: 0001780065 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 3 SEC ACT: 1934 Act SEC FILE NUMBER: 001-38541 FILM NUMBER: 201026065 BUSINESS ADDRESS: STREET 1: 400 TECHNOLOGY SQUARE STREET 2: 10TH FLOOR CITY: CAMBRIDGE STATE: MA ZIP: 02139 BUSINESS PHONE: 857-201-2700 MAIL ADDRESS: STREET 1: 400 TECHNOLOGY SQUARE STREET 2: 10TH FLOOR CITY: CAMBRIDGE STATE: MA ZIP: 02139 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Atlas Venture Associates Opportunity I, LLC CENTRAL INDEX KEY: 0001780066 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 3 SEC ACT: 1934 Act SEC FILE NUMBER: 001-38541 FILM NUMBER: 201026066 BUSINESS ADDRESS: STREET 1: 400 TECHNOLOGY SQUARE STREET 2: 10TH FLOOR CITY: CAMBRIDGE STATE: MA ZIP: 02139 BUSINESS PHONE: 857-201-2700 MAIL ADDRESS: STREET 1: 400 TECHNOLOGY SQUARE STREET 2: 10TH FLOOR CITY: CAMBRIDGE STATE: MA ZIP: 02139 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: Magenta Therapeutics, Inc. CENTRAL INDEX KEY: 0001690585 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] IRS NUMBER: 000000000 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 100 TECHNOLOGY SQUARE STREET 2: 5TH FLOOR CITY: CAMBRIDGE STATE: MA ZIP: 02139 BUSINESS PHONE: 857-201-2700 MAIL ADDRESS: STREET 1: 100 TECHNOLOGY SQUARE STREET 2: 5TH FLOOR CITY: CAMBRIDGE STATE: MA ZIP: 02139 3 1 doc3.xml FORM 3 SUBMISSION X0206 3 2020-06-29 0 0001690585 Magenta Therapeutics, Inc. MGTA 0001759241 Atlas Venture Opportunity Fund I, L.P. 400 TECHNOLOGY SQUARE 10TH FLOOR CAMBRIDGE MA 02139 0 0 0 1 See remarks 0001780065 Atlas Venture Associates Opportunity I, L.P. 400 TECHNOLOGY SQUARE 10TH FLOOR CAMBRIDGE MA 02139 0 0 0 1 See remarks 0001780066 Atlas Venture Associates Opportunity I, LLC 400 TECHNOLOGY SQUARE 10TH FLOOR CAMBRIDGE MA 0 0 0 1 See remarks Common Stock 1250000 D The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas Venture Opportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. Each of AVAO I LP and AVAO I LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Opportunity Fund I, except to the extent of its pecuniary interest therein, if any. The reporting persons purchased the common stock reported herein in an underwritten public offering on June 29, 2020. The reporting persons are under common control with Atlas Venture Fund X, L.P., which, together with the reporting persons, collectively beneficially own more than 10% of the Issuer's outstanding common stock, and as a result the reporting persons and Atlas Venture Fund X, L.P. may be deemed to be members of a group. However, the reporting persons disclaim such group membership, and this report shall not be deemed an admission that the reporting persons are members of a group that owns more than 10% of the outstanding common stock for purposes of Section 16 or for any other purpose. Atlas Venture Opportunity Fund I, L.P., By: Atlas Venture Associates Opportunity I, L.P., its general partner, By: Atlas Venture Associates Opportunity I, LLC, its general partner, By: Ommer Chohan, Chief Financial Officer, /s/ Ommer Chohan 2020-07-13 Atlas Venture Associates Opportunity I, L.P., By: Atlas Venture Associates Opportunity I, LLC, its general partner, By: Ommer Chohan, Chief Financial Officer, /s/ Ommer Chohan 2020-07-13 Atlas Venture Associates Opportunity I, LLC, By: Ommer Chohan, Chief Financial Officer, /s/ Ommer Chohan 2020-07-13