X0306 4 2017-05-09 0 0001689813 Biohaven Pharmaceutical Holding Co Ltd. BHVN 0001397906 Cha Albert C/O BIOHAVEN PHARMACEUTICALS, INC. 234 CHURCH STREET NEW HAVEN CT 06510 1 0 0 0 Common Shares 2017-05-09 4 C 0 1506818 A 1506818 I See footnote Common Shares 2017-05-09 4 P 0 470000 17.00 A 1976818 I See footnote Series A Preferred Shares 2017-05-09 4 C 0 1506818 0.00 D Common Shares 1506818 0 I See footnote Represents shares received upon conversion of Series A Preferred Shares. The shares are held as follows: 1,323,990 shares are held by Vivo Capital Fund VIII, L.P. ("VCF") and 182,828 shares are held by Vivo Capital Surplus Fund VIII, L.P. ("VCSF"). The reporting person is one of the managing members of Vivo Capital VIII, LLC which is the general partner of both VCF and VCSF, and may be deemed to share voting and dispositive power over the shares held by VCF and VCSF. The reporting person disclaims beneficial ownership over such shares except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of the reported shares for purposes of Section 16 or for any other purposes. The shares are held as follows: 412,973 shares are held by VCF and 57,027 shares are held by VCSF. The reporting person is one of the managing members of Vivo Capital VIII, LLC which is the general partner of both VCF and VCSF, and may be deemed to share voting and dispositive power over the shares held by VCF and VCSF. The reporting person disclaims beneficial ownership over such shares except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of the reported shares for purposes of Section 16 or for any other purposes. Effective immediately prior to the closing of the Issuer's initial public offering of its common shares, each Series A Preferred Share automatically converted into one common share of the Issuer. The Series A Preferred Shares had no expiration date. /s/ Darren DeStefano, Attorney-in-fact 2017-05-09