On Thursday share prices on the blue chip C20 index took their biggest hit since the index was launched in 2011. Vestas suffered most on Thursday, with its shares falling 8 percent in one day.
All 20 companies then opened badly on Friday. The index was down 2 percent at the beginning of the day and was still 1.5 percent down in the early afternoon.
Per Hansen, an economist at the investment company Nordnet, told Børsen that the market was responding to declining growth in the Chinese economy.
“It’s definitely first and foremost uncertainty regarding economic growth in China that makes investors nervous and gets them to pull out of the shares,” he said.