Boliden fell 19.9 percent after the mining group clarified that damage to the Garpenberg mine following high seismic activity is reducing production and financial results.
Handelsbanken, in turn, fell 14.8 percent. The share traded ex-dividend for the day.
Technology trading company Addtech fared better, up 1.3 percent.
The stock market's decline, like the gains of the previous three days, was closely linked to the price of oil. A barrel of North Sea oil traded at $108 after rising 5.8 percent during the day.
The stock exchanges in Frankfurt, London and Paris were also falling sharply, as was trading in New York.
