X0306 4 2021-11-29 0 0001820630 Proterra Inc PTRA 0001865696 Porter Brook F C/O PROTERRA INC 1815 ROLLINS ROAD BURLINGAME CA 94010 1 0 0 0 Common Stock 2021-11-29 4 A 0 8812 0.00 A 11905 D Common Stock 3571012 I See Footnote Certain of the shares are subject to forfeiture to the Issuer if underlying vesting conditions are not met. G2VP I, LLC, for itself and as nominee for G2VP Founders Fund I, LLC ("G2VP"), 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. /s/ Luke Finn, Attorney-in-Fact 2021-12-01