Tue, Oct 08, 2013 12:00 - Petaquilla Minerals Ltd. (PTQMF: OTCQB) - Tier Change - The symbol, PTQMF, no longer is classified as OTC Pink Limited. As of Tue, Oct 08, 2013, PTQMF resides in the OTCQB tier. You may find a complete list of tier changes at otcmarkets.com.