Hyliion Holdings Corp.

Tortoise Acquisition Corp., which traded under the ticker SHLL, was a blank-check company sponsored by Tortoise Acquisition Sponsor LLC that completed its initial public offering in 2019, targeting the commercial transportation and clean energy sector. In June 2020, the company filed a DEFA14A — definitive additional proxy materials — with the SEC in connection with its proposed business combination with Hyliion Inc., a developer of hybrid-electric and natural gas powertrain systems for Class 8 semi-trucks. The filing, accession number 0001213900-20-015312, supplemented earlier proxy materials distributed to shareholders ahead of the combination vote. The transaction closed in October 2020, with the combined company rebranding as Hyliion Holdings Corp. and trading under the ticker HYLN on the New York Stock Exchange. For complete filings, deal terms, and real-time SPAC data on Hyliion and hundreds of other transactions, sign up for full access at SpacDesk.