JOHN J. WALSH JR - 13 May 2021 Form 4 Insider Report for Mimecast Ltd (MIME)

Role: Sr. Vice Pres., Engineering
Signature: /s/ Robert P. Nault, Attorney-in-Fact
Issuer symbol: MIME
Transactions as of: 13 May 2021
Net transactions value: -$967,955
Form type: 4
Filing time: 14 May 2021, 17:10:44 UTC
Next filing: 17 May 2021
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MIME	Ordinary Shares	Options Exercise	$489,000	+20,000	+172%	$24.45	31,642	13 May 2021	Direct
transaction	MIME	Ordinary Shares	Options Exercise	$174,100	+5,000	+16%	$34.82	36,642	13 May 2021	Direct
transaction	MIME	Ordinary Shares	Sale	$1,488,643	-31,976	-87%	$46.56	4,666	13 May 2021	Direct	F1
transaction	MIME	Ordinary Shares	Sale	$142,412	-3,024	-65%	$47.09	1,642	13 May 2021	Direct	F2
holding	MIME	Restricted Share Units						14,687	13 May 2021	Direct	F3, F4
holding	MIME	Restricted Share Units						22,469	13 May 2021	Direct	F3, F5
holding	MIME	Restricted Share Units						5,500	13 May 2021	Direct	F3, F6
holding	MIME	Restricted Share Units						850	13 May 2021	Direct	F3, F7
holding	MIME	Restricted Share Units						825	13 May 2021	Direct	F3, F8

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	MIME	Share Option (Right to Buy)	Options Exercise	$0	-20,000	-16%	$0.000000	103,500	13 May 2021	Ordinary Shares	20,000	$24.45	Direct	F9
transaction	MIME	Share Option (Right to Buy)	Options Exercise	$0	-5,000	-27%	$0.000000	13,200	13 May 2021	Ordinary Shares	5,000	$34.82	Direct	F10

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

Explanation of Responses:

Id	Content
F1	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.80 - $46.705, 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.
F2	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $47.02 - $47.28, 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.
F3	Each restricted share unit represents a contingent right to receive one share of the Issuer's Ordinary Shares.
F4	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.
F5	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.
F6	These restricted share units were granted on April 1, 2019. Twenty-five percent (25%) of the units vested 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 two (2) years, provided that the Reporting Person remains an employee of the Issuer on each such vesting date.
F7	These restricted share units were granted on June 1, 2018. Twenty-five percent (25%) of the units vested on June 1, 2019, twenty-five percent (25%) of the units vested on June 1, 2020, 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.
F8	These restricted share units were granted on April 2, 2018. Twenty-five percent (25%) of the units vested on April 2, 2019, twenty-five percent (25%) of the units vested on April 2, 2020, twenty-five percent (25%) of the units vested on April 2, 2021, and the remainder of the units vest on April 2, 2022, provided that the Reporting Person remains an employee of the Issuer on such vesting date.
F9	This option was granted on May 1, 2017. Twenty-five percent (25%) of the shares vested on May 1, 2018 and the remainder of the shares vested on a quarterly basis over the next three (3) years. This option is fully vested.
F10	This option was granted on April 2, 2018. Twenty-five percent (25%) of the shares vested on April 1, 2019, and the remainder of the shares vest on a quarterly 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 April 2, 2018).