The major bank's shares rose 3.7 percent after the US Department of Justice announced on Wednesday evening that the Swedbank investigation into suspected money laundering had been closed without action. This could open the way to extra dividends, as the bank has set aside reserves to cover feared fines.
Ericsson's shares rose 1.6 percent after the announcement that the telecom manufacturer has initiated union negotiations over a staff reduction that could affect approximately 1,600 positions - just over a tenth of its staff - in Sweden.
Among the losers were pharmaceutical company AstraZeneca, down 1.8 percent, and clothing giant H&M, which fell 1.2 percent.
Oil prices fell more than 4 percent after US President Donald Trump signaled that he would likely refrain from an attack on the troubled oil-producing country of Iran for the time being.
This also depressed the prices of gold and silver, which have risen to historically high levels in this year's new wave of geopolitical unrest, combined with market reactions to the Trump administration's controversial threat to impeach US Federal Reserve Chairman Jerome Powell.
Developments on leading European stock exchanges were mixed, with gains in London and Frankfurt while the Paris Stock Exchange lost slightly.
The OMXS index closed down 0.1 percent on Wednesday. Since the beginning of the year, the index has been up 4.0 percent.
