X0306 4 2015-06-30 0 0001454789 CATABASIS PHARMACEUTICALS INC CATB 0001431443 Clarus Lifesciences II, L.P. C/O CLARUS VENTURES, LLC 101 MAIN STREET SUITE 1210 CAMBRIDGE MA 02142 0 0 1 0 0001431439 Clarus Ventures II GP, L.P. C/O CLARUS VENTURES, LLC 101 MAIN STREET SUITE 1210 CAMBRIDGE MA 02142 0 0 1 0 0001431437 Clarus Ventures II, LLC C/O CLARUS VENTURES, LLC 101 MAIN STREET SUITE 1210 CAMBRIDGE MA 02142 0 0 1 0 Common Stock 2015-06-30 4 C 0 1618676 A 1618676 D Common Stock 2015-06-30 4 C 0 757117 A 2375793 D Common Stock 2015-06-30 4 P 0 376695 12 A 2752488 D Series A Preferred Stock 2015-06-30 4 C 0 20800000 0 D Common Stock 1618676 0 D Series B Preferred Stock 2015-06-30 4 C 0 9728971 0 D Common Stock 757117 0 D The Series A and Series B Preferred Stock converted into Common Stock on a 1-for-12.85 basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A and B Preferred Stock were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering. The shares had no expiration date. These shares are owned directly by Clarus Lifesciences II, L.P. ("Clarus"). Clarus Ventures II GP, L.P. (the "GPLP"), as the sole general partner of Clarus, may be deemed to beneficially own certain of the shares held of record by Clarus. The GPLP disclaims beneficial ownership of all shares held of record by Clarus in which the GPLP does not have an actual pecuniary interest. Clarus Ventures II, LLC (the "GPLLC"), as the sole general partner of the GPLP, may be deemed to beneficially own certain of the shares held of record by Clarus. The GPLLC disclaims beneficial ownership of all shares held of record by Clarus in which it does not have an actual pecuniary interest. Each of Nicholas Galakatos, Denis Henner, Robert Liptak, Nicholas Simon, Michael Steinmetz and Kurt Wheeler, as individual Managing Directors of the GPLLC, may be deemed to beneficially own certain of the shares held of record by Clarus. Each of Messrs. Galakatos, Henner, Liptak, Simon, Steinmetz and Wheeler disclaims beneficial ownership of all shares held of record by Clarus in which he does not have an actual pecuniary interest. By: /s/ Robert Liptak, Manager of Clarus Ventures II, LLC, general partner of Clarus Ventures II GP, L.P., general partner of Clarus Lifesciences II, L.P. 2015-06-30 By: /s/ Robert Liptak, Manager of Clarus Ventures II, LLC, general partner of Clarus Ventures II GP, L.P. 2015-06-30 By: /s/ Robert Liptak, Manager of Clarus Ventures II, LLC 2015-06-30