Quadro Resources Ltd. (QDROF: OTCQB) | Piggyback Qualified Sat, Oct 10, 2020 12:00 - Quadro Resources Ltd. ( QDROF : OTCQB) - Piggyback Qualified - Effective Sat, Oct 10, 2020, QDROF is designated with the status of piggyback qualified. Piggyback qualification allows market participants, in addition to the original 211 form filer, to quote the respective security. You may find a complete list of piggyback qualifications at otcmarkets.com .