 BERLIN--BUSINESS WIRE--SIGNA Sports United SSU or the Company, the worlds leading sports e-commerce and technology platform, today announced additional PIPE investments and a new redemption backstop agreement related to its proposed business combination agreement with Yucaipa Acquisition Corporation NYSE: YAC Yucaipa or YAC, a publicly-traded special purpose acquisition company. These additional elements increase deal certainty and ensure the listing of the enlarged pro forma c 