Musta Pörssi to wind up operations HELSINKI, Finland, 2015-12-7 — /EPR Retail News/ — Kesko will gradually wind up Musta Pörssi Ltd's operations and close the mustaporssi.fi online store by the end of 2015. Business operations of Musta Pörssi have focused on home technology and electronics. Kesko closed the chain operations of Musta Pörssi in 2013…