Decarbonization Plus Acquisition Corp IV (Nasdaq: DCRD) is a blank-check company sponsored by Decarbonization Plus Acquisition Holdings IV LLC, an affiliate of Riverstone Holdings, a private equity firm with deep roots in the energy sector. The SPAC completed its initial public offering in 2021, targeting businesses operating at the intersection of energy transition and decarbonization. In January 2023, DCRD filed a DEFA14A — supplemental definitive proxy materials — in connection with its proposed business combination with Hammerhead Energy Inc., a Canadian oil and gas producer focused on responsible resource development. The shareholder vote proceeded and the transaction subsequently closed, taking Hammerhead public as a listed energy company. Visit SpacDesk and sign up for full data, filings, and deal analytics on DCRD and hundreds of other SPAC transactions.