likely financial speculation
there's also another hypothesis which is: they publicly denied that they're trying to buy https://monzo.com/
And perhaps the recent news that they are expanding into the USA?
> IMO: market reaction to Brazilian elections > The entire Brazilian stock market climbed after the election results. It's probably compounding all other causes you listed.
It's not even at an all-time high, which "going through the roof" usually implies:slightly_smiling_face:. Normal market movement, it seems.