Giantplus Technology (TPE:8105) Chairman Tamura Takayuki has been removed from his position after TOPPAN transferred more than half of the shares it held at the time of his election.
Shares fell 10% in Friday's afternoon trade.
Tamura Takayuki was one of the four representative directors appointed by TOPPAN for Giantplus Technology's board, according to a Friday Taiwan Exchange
The share transfer triggered the automatic discharge of the representative directors, ending Tamura's tenure as chairman.
The company has not named a successor yet.