He did not inherit anything from his father.
He produces 3 million eggs per day on his farm in Sugoi. He exports all of them to other countries that have food problems.
He sells 10 lorries of vegetables in Kisumu every day. He produces these vegetables through irrigation.
He sells 2 million shillings worth of fish per week from his fish ponds. These are also exported.
He has a hardwood workshop that employs 200 people. This workshop has machines from Germany and Italy. These hardwood products are also exported. People in Europe are tired of fake products from China and they don't have wood in their countries so Ruto has identified a lucrative market there and he is supplying it.
He has an Insurance company that he formed soon after leaving the University.
He has rental houses on Jogoo Road.
He has too much money he needs to give some to churches to reduce the amount.
This is according to Kimani Ngujiri in this interview Starting from 9:30
https://www.youtube.com/watch?v=93DAVsTxYJg