The shares of telecommunications provider Ericsson traded mostly sideways throughout Wednesday, but began to drop sharply after 3:30 p.m. The reason for the decline remains unclear, with no company-specific news reported in the market, according to Dagens industri.

Shortly before the closing call, Ericsson's B shares had fallen by 4.5 percent. At the same time, industry peer Nokia's shares were down 2.0 percent in Helsinki.