Which banks hold the most derivatives?

Could you please elaborate on the current landscape regarding which banks hold the most derivatives? Are there any particular regions or countries where these banks are predominantly located? Additionally, what types of derivatives do they typically hold, and how does this impact their overall financial stability and risk exposure? It would be insightful to understand the motivations behind their decisions to hold such large portfolios of derivatives, as well as the potential consequences for the global financial system should any of these banks face difficulties.