The Japanese industrial giant has had about 45% of its value wiped off since 26 December.
That came after it warned of a heavy one-off loss at its nuclear business that some expect to near $6bn (£4.7bn).
It has dealt a huge blow to the company as it tries to move on from a profit-inflating scandal.
What has gone wrong?
Most people still recognise the name Toshiba for its electrical products but that is no longer at the heart of its business. It no longer makes televisions for export, for example, and its white goods business is losing money.
Today Toshiba is a very diverse conglomerate, and these latest problems stem from its nuclear services business which brings in about a third of its revenue.
Toshiba said in late December 2016 that it faced a possible heavy one-off loss, linked to a deal done by its US subsidiary, Westinghouse Electric. read more here