X0306 4 2020-10-01 0 0001759631 Hyliion Holdings Corp. HYLN 0000904737 JENKINS HOWARD M C/O HYLIION HOLDINGS CORP. 1202 BMC DRIVE, SUITE 100 CEDAR PARK TX 78613 1 0 1 0 0001826735 AXIOMA VENTURES, LLC 601 SOUTH BOULEVARD TAMPA FL 33606 0 0 1 0 0001826734 AXIOMA HOLDINGS, LLC 601 SOUTH BOULEVARD TAMPA FL 33606 0 0 1 0 0001826733 AXIOMA MANAGEMENT, LLC 601 SOUTH BOULEVARD TAMPA FL 33606 0 0 1 0 0001826557 JENKINS ALEXANDER H. 601 SOUTH BOULEVARD TAMPA FL 33606 0 0 1 0 0001826588 LINGAM KIRAN 601 SOUTH BOULEVARD TAMPA FL 33606 0 0 1 0 Common Stock 2020-10-01 4 A 0 16656790 A 16656790 I By LLC Received pursuant to the Business Combination Agreement and Plan of Reorganization, dated as of June 18, 2020, by and among Tortoise Acquisition Corp. ("Tortoise"), Hyliion Inc. ("Legacy Hyliion") and SHLL Merger Sub Inc., a wholly-owned subsidiary of Tortoise ("Merger Sub"), pursuant to which Merger Sub merged with and into Legacy Hyliion, with Legacy Hyliion surviving the merger as a wholly-owned subsidiary of Tortoise (which subsequently changed its name to "Hyliion Holdings Corp.", the "Issuer"). Shares are held directly by Axioma Ventures, LLC ("Ventures"). The sole member of Ventures is Axioma Holdings, LLC ("Holdings"). The sole manager of Holdings is Axioma Management, LLC ("Management"). Howard Jenkins, Alexander Jenkins and Kiran Lingam are managers of Management. Each of Holdings, Management, Howard Jenkins, Alexander Jenkins and Kiran Lingam disclaims beneficial ownership of such shares except to the extent of its or his respective pecuniary interest therein. /s/ Howard M. Jenkins 2020-10-05 Axioma Ventures, LLC: by /s/ Howard M. Jenkins, Manager of Manager of Member 2020-10-05 Axioma Holdings, LLC: by /s/ Howard M. Jenkins, Manager of Manager 2020-10-05 Axioma Management, LLC: by /s/ Howard M. Jenkins, Manager 2020-10-05 /s/ Alexander H. Jenkins 2020-10-05 /s/ Kiran Lingam 2020-10-05