MIME 2018 Proxy Statement

(4) Represents the maximum amount of each named executive officer’s cash incentive opportunity under the Incentive Plan as described in the “Compensation Discussion and Analysis – Executive Compensation Program Elements – Incentive Compensation” above. The actual cash incentive payments for fiscal year 2018 are provided in the “2018 Summary Compensation Table” above. (5) The exercise price of these options to purchase our ordinary shares is equal to the closing price of our ordinary shares on The Nasdaq Global Select Market on the grant date. (6) Represents the grant date fair value of an option granted to Ms. Bishop-Levesque in fiscal 2018, calculated in accordance with FASB ASC Topic 718, excluding the estimated impact of forfeitures related to service- based vesting conditions. The assumptions made in valuing this option are discussed in Note 11 to our audited financial statements for the year ended March 31, 2018, included in our Annual Report on Form 10-K. The amount in this column does not reflect the actual value that may be realized by Ms. Bishop- Levesque upon exercise. Outstanding Equity Awards at March 31, 2018 Table The following table sets forth certain information regarding outstanding equity awards granted to our named executive officers that remained outstanding as of March 31, 2018. Options to purchase our ordinary shares granted prior to November 2015 were granted pursuant to the Mimecast 2010 EMI Share Option Scheme and options granted after such date were granted pursuant to the Mimecast Limited 2015 Share Option and Incentive Plan. Option Awards Number of Securities Underlying Unexercised Options (1) Name Grant Date Exercisable (#) Unexercisable (#) Option Exercise Price ($) Option Expiration Date Peter Bauer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2/1/17 18,750 56,250 21.83 2/1/27 2/1/16 75,000 75,000 9.21 2/1/26 Peter Campbell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2/1/17 25,000 75,000 21.83 2/1/27 2/1/16 (2) 45,000 120,000 9.21 2/1/26 8/6/14 (3) 47,333 — 6.48 8/5/24 Edward Jennings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2/1/17 12,500 37,500 21.83 2/1/27 2/1/16 20,000 20,000 9.21 2/1/26 8/1/15 (4) 157,558 265,530 9.78 7/31/25 Robert P. Nault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2/1/17 6,250 18,750 21.83 2/1/27 10/3/16 50,000 110,000 19.28 10/3/26 Janet Bishop-Levesque . . . . . . . . . . . . . . . . . . . . . . . 1/2/18 — 80,000 28.23 1/2/28 (1) Except as otherwise set forth below, the ordinary shares underlying each of the outstanding options vest and become exercisable at a rate of 25% of the total grant on the first anniversary of the grant date with the remaining 75% vesting in 12 equal quarterly installments over the first 12 quarters following the first anniversary of the grant date. (2) Represents an option to purchase 240,000 ordinary shares, 75,000 of which had been exercised as of March 31, 2018. (3) Represents an option to purchase 183,333 ordinary shares, 136,000 of which had been exercised as of March 31, 2018. The ordinary shares underlying this share option vested and became exercisable at a rate of 50% of the total grant on the first anniversary of the grant date with the remaining 50% vesting in four equal quarterly installments over the first four quarters following the first anniversary of the grant date. (4) Represents an option to purchase 708,088 ordinary shares, 285,000 of which had been exercised as of March 31, 2018. 36