And for fun, I ended up doing the same in parallel for the 2021 data:

https://gist.github.com/lfittl/2f112698f908d38f43f4f2aeaaa94...

Note that some of the folks on the list have changed jobs in the last 2 years, so it wouldn't be accurate to attribute all contributions to the current employer (plus some folks contribute on their own time).

Also, the EDB / 2ndquadrant acquisition has led to a lot of EDB-attributed contributions, which hopefully will last :)

Edit: FWIW, I think your 2020 list has Tom Lane working for Google - thats not accurate (I think you got the wrong one from LinkedIn), as he is still employed by Crunchy Data (since leaving Salesforce in 2015), to my knowledge.