X0306 4 2018-06-15 0 0001035354 Eloxx Pharmaceuticals, Inc. ELOX 0001726016 Kleijwegt Martijn C/O ELOXX PHARMACEUTICALS, INC. 950 WINTER STREET, 4TH FLOOR NORTH WALTHAM MA 02451 1 0 0 0 Stock Option (Right to Buy) 23.27 2018-06-15 4 A 0 40000 0.00 A 2028-06-15 Common Stock 40000 40000 D One half (1/2) of the shares underlying the option shall vest on June 15, 2019 (the "Cliff Vesting Date"), the remainder of the grant shall vest in equal installments on each successive monthly anniversary of the Cliff Vesting Date, subject to Reporting Person's continuous service as of each such date. /s/ Martijn Kleijwegt 2018-06-19