Portex Minerals Inc. (STACF: Pink No Information) | Venue Change Fri, Oct 30, 2020 12:00 - Portex Minerals Inc. ( STACF : OTC Link) - Venue Change - The symbol, STACF, no longer trades on Grey Market. As of Fri, Oct 30, 2020, STACF trades on OTC Link. You may find a complete list of venue changes at otcmarkets.com .