I'm maybe biased but here's Reuters [1] in 2021 claiming it's Stockholm, Sweden. [1] https://www.reuters.com/business/finance/how-sweden-became-silicon-valley-

I'm maybe biased but here's Reuters [1] in 2021 claiming it's Stockholm, Sweden. [1] https://www.reuters.com/business/finance/how-sweden-became-silicon-valley-europe-2021-08-11/#:~:text=Stockholm%20is%20second%20only%20to,at%20venture%20capital%20firm%20Atomico https://www.reuters.com/business/finance/how-sweden-became-s....