On 31/01/2013, HNX officially admitted the delisting of TLT:

Name of issuer: Viglacera Thanglong Ceramic Tiles JSC
Stock code: TLT
Securities type: common stock
Reason for delisting on HNX: to be listed on UPCoM
Total delisted volume: 6,989,800 shares
Total delisted par value: VND69,898,000,000
Delisting date: 28/02/2013
Last trading day on HNX: 27/02/2013