The decline comes after news this weekend that peace talks between Iran and the United States have stalled. President Donald Trump has also threatened to impose a blockade on all ships trying to enter or leave the Strait of Hormuz.
The development has caused oil prices to rise by almost 7 percent on Monday morning, with Brent crude now trading at around $100 a barrel. European gas prices have also risen by around 8 percent.
Among the companies on the Stockholm Stock Exchange's OMXS30 index, only air-source heat-pump manufacturer Nibe and Tele2 are rising. Nibe, which traditionally rises when energy prices increase, is up 2.4 percent.
In the opposite direction, Industrivärden is down 3.3 percent, while Sandvik is down 2.3 percent, both after lowered recommendations from two banks.
Leading Asian stock exchanges are falling in today's trading, while the US dollar has strengthened to 9.33 kronor.
