Ecoark Holdings, Inc. (ZEST: OTCQB) | Tier Change Fri, Nov 08, 2019 12:00 - Ecoark Holdings, Inc. ( ZEST : OTCQB) - Tier Change - The symbol, ZEST, no longer is classified as OTCQX U.S.. As of Fri, Nov 08, 2019, ZEST resides in the OTCQB tier. You may find a complete list of tier changes at otcmarkets.com .
