X0306 4 2018-03-31 0 0001364099 Innophos Holdings, Inc. IPHS 0001671067 Kieftenbeld Hermanus 259 PROSPECT PLAINS RD. CRANBURY NJ 08512 0 1 0 0 Senior VP and CFO Common Stock, Par Value $0.001 2018-03-31 4 F 0 1023 40.21 D 7832 D Common Stock, Par Value $0.001 2018-04-02 4 A 0 3919 0.00 A 11751 D 2018 Option to Purchase 39.28 2018-04-02 4 A 0 16145 0.00 A 2028-04-02 Common Stock 16145 16145 D Represents the numbers of shares granted in 2016 and 2017 withheld for tax purposes. On April 2, 2018 these shares of restricted common stock were granted to the reporting person to be held in escrow, subject to certain vesting and forfeiture provisions. The grant vests in three equal installments over a three year period beginning March 31, 2019. The second installment date is March 31, 2020, followed by the third installment due on March 31, 2021. The reporting person was granted options on April 2, 2018. Options vest in 3 equal annual installments beginning March 31, 2019, The second installment date is March 31, 2020, followed by third installment date of March 31, 2021. /s/ Joshua S. Horenstein, as Attorney-in-fact 2018-04-03