Heather Bentley - Dec 1, 2021 Form 4 Insider Report for Mimecast Ltd (MIME)

Role: SVP, Customer Success & Supp.
Signature: /s/ Robert P. Nault, Attorney-in-Fact
Stock symbol: MIME
Transactions as of: Dec 1, 2021
Transactions value $: -$224,287
Form type: 4
Date filed: 12/2/2021, 04:30 PM
Previous filing: Jul 6, 2021
Next filing: Apr 4, 2022

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MIME	Ordinary Shares	Options Exercise		+3.31K	+84.77%		7.22K	Dec 1, 2021	Direct	F1, F2
transaction	MIME	Restricted Share Units	Tax liability	-$224K	-2.94K	-15.67%	$76.34	15.8K	Dec 1, 2021	Direct	F2, F3, F4, F5
transaction	MIME	Restricted Share Units	Options Exercise		-3.31K	-20.95%		12.5K	Dec 1, 2021	Direct	F2, F5, F6
holding	MIME	Restricted Share Units						3.37K	Dec 1, 2021	Direct	F2, F7
holding	MIME	Restricted Share Units						12.2K	Dec 1, 2021	Direct	F2, F8
holding	MIME	Restricted Share Units						9.4K	Dec 1, 2021	Direct	F2, F9

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The number of Ordinary Shares reflects the settlement of restricted share units upon vesting, net of Ordinary Shares that were retained (but not issued) by the Issuer in satisfaction of tax withholding obligations associated with the vesting of such units.
F2	Each restricted share unit represents a contingent right to receive one share of the Issuer's Ordinary Shares.
F3	The restricted share units reported as disposed of herein reflect the number of Ordinary Shares underlying the restricted share units that were retained (but not issued) by the Issuer in satisfaction of tax withholding obligations associated with the vesting of such units.
F4	Price reflects the closing price of the Issuer's Ordinary Shares on the Nasdaq Global Select Market on December 1, 2021.
F5	These restricted share units were granted on December 2, 2019. Twenty-five percent (25%) of the units vested on December 1, 2020, twenty-five percent if the units vested on December 1, 2021, and the remainder of the units vest on an annual basis over the next two (2) years, provided that the Reporting Person remains an employee of the Issuer on each such vesting date.
F6	The restricted share units reported as disposed of herein were settled for the Issuer's Ordinary Shares upon the vesting of such units (as reported in Row 1 above).
F7	These restricted share units were granted on April 1, 2020. Twenty-five percent (25%) of the units vested on April 1, 2021, and the remainder of the units vest on an annual basis over the next three (3) years, provided that the Reporting Person remains an employee of the Issuer on each such vesting date.
F8	These restricted share units were granted on April 1, 2021. Twenty-five percent (25%) of the units vest on April 1, 2022, and the remainder of the units vest on an annual basis over the next three (3) years, provided that the Reporting Person remains an employee of the Issuer on each such vesting date.
F9	These restricted share units were granted on July 1, 2021. Twenty-five percent (25%) of the units vest on July 1, 2022 and the remainder of the units vest on an annual basis over the next three (3) years, provided that the Reporting Person remains an employee of the Issuer on each such vesting date.

Remarks:

Exhibit 24 Power of Attorney (incorporated by reference to Power of Attorney filed as Exhibit 24 to Form 3 filed by the Reporting Person on November 25, 2019).