What are the top 4 banks in Sweden?

I'm curious to know, could you please enlighten me on the matter of Sweden's financial institutions? Specifically, I'm interested in understanding which banks rank among the top four in Sweden? Could you possibly provide me with a brief overview of these banks, perhaps highlighting some of their key features or distinguishing characteristics? I'm eager to learn more about their influence and significance in the Swedish financial landscape. Thank you in advance for your assistance in this matter.