Ahead of the stock market opening, gadget chain Clas Ohlson published financial results showing a substantial profit increase and an extra dividend.
Futures trading in London and Frankfurt was uncertain, with only small price movements.
This follows Wall Street closing at new record highs (again) on Tuesday, and markets were generally up in Asia during overnight trading.
The OMXS index rose 1.5 percent on Tuesday, lifting its year-to-date gain to 4.7 percent.
