I'd say Spotify, Skype and King (Candy Crush) are good examples. I'd count Mojang (Minecraft) too.
Yubico, Klarna, iZettle...
Lots more game companies too, from AAA companies like DICE and Paradox to indie games.
And Tictail and Truecaller. I would also count Skype as Swedish and also Soundcloud even though I think they moved to Berlin pretty early on.
I thought Skype was initially based in Estonia?
According to the Wikipedia article: "Skype was founded in 2003 by Niklas Zennström, from Sweden, and Janus Friis, from Denmark.[30] The Skype software was created by Estonians Ahti Heinla, Priit Kasesalu, and Jaan Tallinn. "
For instance all the companies mentioned in the article ;)