X0206 3 2018-06-20 0 0001681087 AVROBIO, Inc. AVRO 0001664852 Requadt Scott C/O AVROBIO, INC. 1 KENDALL SQUARE, BUILDING 300, STE 201 CAMBRIDGE MA 02139 1 0 0 0 Series A Preferred Stock Common Stock 9435150 I See Footnote Series B Preferred Stock Common Stock 2805179 I See Footnote All series of Convertible Preferred Stock shall automatically convert on a 4.132-for-1 basis into shares of the Issuer's Common Stock immediately prior to the closing of the Issuer's initial public offering and have no expiration date. The shares are held directly by Clarus Lifesciences III, L.P. ("Clarus"). The general partner of Clarus is Clarus Ventures III GP, L.P. ("GPLP"). Clarus Ventures III, LLC ("LLC") is the general partner of GPLP. Each of Nicholas Galakatos, Dennis Henner, Robert Liptak, Scott Requadt, Nicholas Simon, and Kurt Wheeler, as individual managing directors of the LLC, may be deemed to beneficially own certain of the shares held of record by Clarus. Each of Messrs. Galakatos, Henner, Liptak, Requadt, Simon and Wheeler disclaims beneficial ownership of all shares held of record by Clarus in which he does not have an actual pecuniary interest. Mr. Requadt is a member of LLC and a member of the Issuer's board of directors. Mr. Requadt disclaims beneficial ownership of such shares, except to the extent of his proportionate pecuniary interest therein, if any. Exhibit 24 - Power of Attorney /s/ Scott G. Requadt 2018-06-20