John J. Allen - Jun 14, 2021 Form 4 Insider Report for ArcLight Clean Transition Corp. (PTRA)

Role: Chief Executive Officer, Director
Signature: /s/ Joshua Damm, Attorney-in-Fact
Stock symbol: PTRA
Transactions as of: Jun 14, 2021
Transactions value $: $0
Form type: 4
Date filed: 6/16/2021, 08:57 PM
Next filing: Jul 22, 2021

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	PTRA	Stock Option (Right to Buy)	+Grant/Award		+200,812			200,812	Jun 14, 2021	Common Stock	200,812	$2.18	Direct	F1, F2
transaction	PTRA	Stock Option (Right to Buy)	+Grant/Award		+133,875			133,875	Jun 14, 2021	Common Stock	133,875	$2.65	Direct	F2, F3
transaction	PTRA	Stock Option (Right to Buy)	+Grant/Award		+44,625			44,625	Jun 14, 2021	Common Stock	44,625	$6.00	Direct	F2, F4
transaction	PTRA	Stock Option (Right to Buy)	+Grant/Award		+1,338,749			1,338,749	Jun 14, 2021	Common Stock	1,338,749	$5.33	Direct	F2, F5
transaction	PTRA	Stock Option (Right to Buy)	+Grant/Award		+669,375			669,375	Jun 14, 2021	Common Stock	669,375	$11.21	Direct	F2, F5
transaction	PTRA	Stock Option (Right to Buy)	+Grant/Award		+669,375			669,375	Jun 14, 2021	Common Stock	669,375	$16.81	Direct	F2, F5
transaction	PTRA	Stock Option (Right to Buy)	+Grant/Award		+669,375			669,375	Jun 14, 2021	Common Stock	669,375	$22.41	Direct	F2, F5
transaction	PTRA	Stock Option (Right to Buy)	+Grant/Award		+669,375			669,375	Jun 14, 2021	Common Stock	669,375	$28.02	Direct	F2, F5
transaction	PTRA	Stock Option (Right to Buy)	+Grant/Award		+669,375			669,375	Jun 14, 2021	Common Stock	669,375	$5.33	Direct	F2, F6
transaction	PTRA	Stock Option (Right to Buy)	+Grant/Award		+5,020			5,020	Jun 14, 2021	Common Stock	5,020	$4.78	Direct	F2, F7

Explanation of Responses:

Id	Content
F1	The stock option vests as of 1/48 of the total shares monthly beginning on July 29, 2017 until fully vested, subject to the Reporting Person's provision of service to the Issuer on each vesting date.
F2	Pursuant to the business combination of ArcLight Clean Transition Corp. and Proterra Inc ("Old Proterra"), each share of Old Proterra outstanding common stock was automatically converted into the right to shares of the Issuers Common Stock based on a 1 to 0.8925 conversion ratio ("Conversion Ratio"). In addition, each outstanding Old Proterra equity award was automatically converted into a corresponding equity award of the Issuer based on the Conversion Ratio and with the same terms and vesting conditions as the Old Proterra equity awards.
F3	The stock option vests as to 25% of the total shares on February 28, 2019, and thereafter vests as to 1/48 of the total shares monthly until fully vested, subject to the Reporting Person's provision of service to the Issuer on each vesting date.
F4	The stock option vests as of 1/48 of the total shares monthly beginning on January 23, 2020 until fully vested, subject to the Reporting Person's provision of service to the Issuer on each vesting date.
F5	1/16 of the total shares underlying the option vest quarterly installments until fully vested, subject to the Reporting Person's continued service to the Issuer on each vesting date.
F6	The option is fully vested.
F7	The stock option vests as of 1/48 of the total shares monthly beginning on January 21, 2020 until fully vested, subject to the Reporting Person's provision of service to the Issuer on each vesting date.