Which non-US cities typical have Investment Banking tech groups?

Hey everybody,

I apologize that all my posts are so uniform in purpose and theme, but I had another question for the collective: In which international cities do the BB/Elite Boutiques/Mid Market Investment Banks typical have Tech/TMT groups?

Obviously in the US it's all about SF/SV, with NYC and Boston also having decent presences, but which cities internationally have a decent enough tech scene to merit groups being stationed there.

Can anyone comment on the tech scene in London, HK, Singapore, Zurich, or any other Financial hub I'm missing?

As always, the help is much appreciated! Thanks.