After several months of focusing on Sweden, Avanza's customers turned their attention back to the US in May.

US stock markets outperformed their Swedish counterparts during the month, prompting investors to return to favorites such as Nvidia and Berkshire Hathaway, where purchases increased following Warren Buffett's announcement that he would be stepping down at the end of the year.

"US stocks have been conspicuous by their absence from the top of the buy list since January. Now Nvidia, which is the most widely held foreign stock on Avanza, is making a comeback. The stock is up 25 percent in May, which means that it is now also up since the start of the year. Shareholders are hoping for a continued upturn and are buying," said savings economist Philip Scholtzé in a comment.

Investor was the most bought stock, followed by Evolution, which fell during the month on its first-quarter report. Embracer was also bought after a drop in its share price.

On the selling side, there was a shift in the defense sector: German company Rheinmetall was bought while Saab was sold, the opposite of April. Handelsbanken, Swedbank, and SBB were also among the most sold shares.

"SBB is the fourth most owned stock among Avanza's customers and has certainly been a sour note for many, lingering in portfolios with a large red minus sign. So it's not entirely surprising that many are hitting the sell button now that the share price has rebounded by almost 50 percent in May in connection with the company's interim report," concludes Philip Scholtzé.

Most boughtMost sold
Investor BHandelsbanken A
EvolutionSAAB B
NVIDIASwedbank A
Embracer Group BSBB Norden B
Novo Nordisk BNordea Bank
Rheinmetall AGVolvo B
CamurusVolvo Car B
Berkshire Hathaway Inc Class BTelia Company
Storskogen BAsmodee
YubicoNibe Industrier B