Piotr Wozniak acquired an additional 5.79% stake in UHY ECA S.A. (WSE:ECA) on January 2, 2018. Post-completion, Piotr Wozniak will hold 11.46% stake in UHY ECA S.A. Piotr Wozniak completed the acquisition of an additional 5.79% stake in UHY ECA S.A. (WSE:ECA) on January 2, 2018.