X0306 4 2018-01-19 1 0001689813 Biohaven Pharmaceutical Holding Co Ltd. BHVN 0001095435 PORTAGE BIOTECH INC. 47 AVENUE ROAD SUITE 200 TORONTO A6 M5R 2G3 ONTARIO, CANADA 0 0 0 1 former 10% owner Common Stock 2018-01-19 4 S 0 35119 30.0348 D 78771 D Common Stock 2018-01-23 4 S 0 24277 331520 D 54494 D The sales reported in the Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 17, 2017. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.00 - $30.18, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $33.00 - $33.25, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2) to this Form 4. The reduction in shares reflects the sale of shares reported upon and the dividend distribution of 6,102,729 shares of common stock completed on January 16, 2018. Kam Shah, CFO 2018-01-24