Decarbonization Plus Acquisition Corporation IV (DCRDW) is a blank check company, or special purpose acquisition company (SPAC), sponsored by an affiliate of Riverstone Holdings LLC and focused on effecting a merger, capital stock exchange, asset acquisition, stock purchase, reorganization, or similar business combination targeting companies developing platforms to decarbonize carbon-intensive sectors including energy, agriculture, industrials, transportation, and commercial and residential real estate; it offers no current products or services beyond its SPAC structure of common stock, warrants, and units traded publicly prior to a combination. Founded in 2021 and headquartered in Menlo Park, California, the company operated principally in the United States with a focus on low-carbon investment opportunities. In February 2023, it completed a C$1.39 billion business combination with Calgary-based Hammerhead Resources Inc., an upstream oil and gas producer developing multi-zone resources in Alberta's Montney trend; post-merger, the combined entity rebranded as Hammerhead Energy Inc. (Nasdaq: HHRS; TSX: HHRS), targeting net zero Scope 1 and 2 emissions by 2030 via a carbon capture and sequestration program estimated at C$240 million, with DCRD's common stock, warrants, and units suspended from trading and DCRDW warrants surviving as legacy securities exercisable into Hammerhead Energy shares.