Altium Capital was a corporate finance advisory firm founded in 1986 and based in London, United Kingdom. The firm's clients include dynamic growth companies, private and publicly-listed companies, private equity houses and family offices. Altium specialized in advising on raising capital at each stage of a company's development, including flotation, and on all aspects of mergers, takeovers and defenses. The firm was acquired by GCA Advisors on May 24, 2016.