Decarbonization Plus Acquisition Corporation IV (DCRDU) operates as a blank check company, or special purpose acquisition company (SPAC), formed to effect a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or similar business combination with one or more businesses focused on advancing global decarbonization in carbon-intensive sectors; it offers no current products or services beyond its cash held in trust for deployment in a target acquisition. Sponsored by an affiliate of Riverstone Holdings LLC and headquartered in Menlo Park, California, the company launched its initial public offering in 2021, raising $275 million through 27.5 million units priced at $10 each. In a major strategic development, it completed a business combination with Hammerhead Resources Inc. in February 2023 via reverse merger, valuing the combined entity at C$1.39 billion and transitioning operations to Hammerhead Energy Inc., with post-merger proceeds of approximately $320 million earmarked to accelerate carbon capture and storage (CCS) initiatives alongside Hammerhead's Montney shale oil and natural gas production targeting 46,000-48,000 boe/d by 2024; the ticker DCRDU reflects ongoing trading of legacy units as of late 2025.