CleanTech Acquisition Corp. (CLAQW) operates as a special purpose acquisition company formed to effect a merger, share exchange, asset acquisition, stock purchase, reorganization or similar business combination with one or more businesses focused on clean technology and sustainability sectors, including decarbonization, renewable energy, energy efficiency, electric mobility, water and waste management; headquartered in New York, NY, with founding in June 2020 and incorporation in Delaware. The company targets emerging or established enterprises leveraging scalability, sustainability impact, revenue growth potential and technological differentiation, utilizing proceeds from its July 2021 initial public offering of approximately $150 million and potential private investments. In September 2022, CleanTech Acquisition completed its business combination with Nauticus Robotics Inc., a developer of ocean robots, autonomy software and related services, after which the combined entity rebranded as Nauticus Robotics Inc. and began trading under new NASDAQ symbols KITT and KITTW, with CLAQW continuing as the legacy public warrants exercisable into the successor company's shares. No further mergers, acquisitions, funding rounds, product launches or significant operational changes have been announced since the 2022 transaction, and the warrants maintain independent trading on NASDAQ amid low volume and no current business combination activity.