That's a decent amount, even Jim Simons only manages iro $3.5m a day I've just finished "The man who solved the markets" and although it covered pretty much the same years as Dark Pools it had a slightly different take on that period and was reasonably entertaining. What is unsettling though is how much all these multi billionaires are involved in politics. Simons' co-ceo Robert Mercer essentially bankrolled Trump and is said to be the money behind Brexit too. Meanwhile Simons has been giving millions to the Democrats. You can see why that because an unsustainable boardroom duo!
The other takeaway from Jim Simon's firm Renaissance (apart from 30yrs of 66% returns which has made him more money than old man Buffett) is that the 300 employees each have at least $50m of their own money in the fund. Sounds like the wages are decent!