Brook F. Porter - 14 Jun 2021 Form 4 Insider Report for ArcLight Clean Transition Corp.

Role: Director
Signature: /s/ Joshua Damm, Attorney-in-Fact
Issuer symbol: N/A
Transactions as of: 14 Jun 2021
Net transactions value: $0
Form type: 4
Filing time: 16 Jun 2021, 20:44:26 UTC
Next filing: 25 Aug 2021
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	PTRA	Common Stock	Award		+1,000,000			1,000,000	14 Jun 2021	See Footnote	F1, F2
transaction	PTRA	Common Stock	Award		+1,532,233	+153%		2,532,233	14 Jun 2021	See Footnote	F2, F3

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	Employee Stock Option (Right to Buy)	Award		+200,812			200,812	14 Jun 2021	Common Stock	200,812	$4.98	Direct	F3, F4
transaction	PTRA	Employee Stock Option (Right to Buy)	Award		+44,625			44,625	14 Jun 2021	Common Stock	44,625	$6.00	Direct	F3, F5
transaction	PTRA	Employee Stock Option (Right to Buy)	Award		+20,081			20,081	14 Jun 2021	Common Stock	20,081	$4.78	Direct	F3, F6

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

Explanation of Responses:

Id	Content
F1	In connection with the closing of the business combination (the "Business Combination") of ArcLight Clean Transition Corp. ("ArcLight") and Proterra Inc ("Old Proterra"), G2VP I, LLC acquired shares of the Issuer's common stock at a price of $10.00 per share on the terms and conditions set forth in a subscription agreement.
F2	G2VP I, LLC, for itself and as nominee for G2VP Founders Fund I, LLC, is the record holder of the securities reported herein. The Reporting Person, together with Ben Kortlang, David Mount and Daniel Oros, is a managing member of G2VP I Associates, LLC, which is the managing member of G2VP, and may be deemed to share voting and dispositive control over the shares held by G2VP. G2VP I Associates, LLC and each of its managing members disclaim beneficial ownership of these shares held by G2VP except to the extent of any pecuniary interest therein.
F3	Pursuant to the Business Combination, each share of Old Proterra outstanding common stock was automatically converted into the right to receive shares of the Issuer's 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 award.
F4	The stock option vests as of 1/48 of the total shares monthly beginning on October 25, 2018 until fully vested, subject to the Reporting Person's provision of service to the Issuer on each vesting date.
F5	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.
F6	The stock option vests as of 1/48 of the total shares monthly beginning on January 21, 2021 until fully vested, subject to the Reporting Person's provision of service to the Issuer on each vesting date.