Shares in the tour and cruise operator TUI AG, which are listed in London, traded almost a fifth lower in early afternoon after the company had issued a profit warning in the morning.
At 1230 local time, the shares had lost 17.80% since the opening and traded at £9.73. They had hit a low of £9.63 earlier in the session, whilst the session high had been £10.66.
The benchmark FTSE100 share index of the London market was down 0.04% at the same time
The shares in TUI that has its headquarters in Hannover in Germany have lost almost half of their value since hitting a high of £18.16 in may last year.
TUI AG owns 50% of the German cruise operator TUI Cruises and is full owner of the expedition and luxury operator Hapag-Lloyd Kreuzfahrten and UK based Marella Cruises.