There's 29 top CS conferences there with best papers since 1996. And NeurIPS and ICSA will be added soon...
It's kind of surprising to me that Microsoft Research is the all-time leader, gathering more best paper awards than any top university. Wow. This in itself tells a story about Microsoft Research.
Do you happen to have a time series on this? Would be interesting to see the trends in your data, e.g. to check how industrial research fares vs. academic research as a function of time. (There are some theories suggesting that industrial research is in a general decline [0]. Though the "best paper awards" metric is surely far from being perfect, it might still be viable as a proxy for corporate research performance.)