https://wikimediafoundation.org/role/staff-contractors/
According to the Form 990, there were 320 US employees and a small number of non-US employees in 2020:
https://upload.wikimedia.org/wikipedia/foundation/e/e4/Wikim...
Note the explanation of what's included in the salary costs here:
https://meta.wikimedia.org/wiki/IRS_tax_related_information/...
So I reckoned the average salary cost is more like $200k per person:
https://lists.wikimedia.org/hyperkitty/list/wikimedia-l@list...
Top earners are here:
https://upload.wikimedia.org/wikipedia/foundation/e/e4/Wikim...