Tether is possibly a company with the highest profit per employee.

So a company behind Tether is Tether Limited Inc. and just few days ago they posted that they had a profit of 1.48 billion USD in first fiscal quarter of 2023 ( https://www.coindesk.com/business/2023/05/10/tether-reports-148b-profit-in-q1-reveals-bitcoin-gold-reserves/ ). According to information available online they have 49 employees as stated on their Linkedin page.

So basically in just this last fiscal quarter they managed to have a profit of more than 30 million USD per employee, so yes that's not even revenue we're talking about, just pure profits. According to WSJ a company that's called Air Lease was company with the highest annual profit per employee last year with around $4.5 million profit per employee, and the second one on the list is Fannie Mae with profit of just over $1.5 million per employee. And Tether just blows them out of water in just one fiscal quarter. At least according to these profit figures that they posted.