Chelsea Oil and Gas Ltd. (COGLF: Pink No Information) | Tier Change Sat, May 04, 2019 12:00 - Chelsea Oil and Gas Ltd. ( COGLF : Pink No Information) - Tier Change - The symbol, COGLF, no longer is classified as Pink Current. As of Sat, May 04, 2019, COGLF resides in the Pink No Information tier. You may find a complete list of tier changes at otcmarkets.com .