The people to look at are, say, Peter Oppenheimer, former CFO of Apple (picked at random). I'm sure his net worth is in the hundreds of millions and he has a few very nice houses -- but what's the likelihood that a significant portion of his wealth is reintroduced into the economy? I really know nothing about him, so maybe I'm being unfair and he spends lavishly on yachts and mansions, or is an angel investor in 100s of startups, but I think the prototypical Fortune 500 C-level is probably someone who lives very well, but not lavishly and not up to their very generous means.
I should also note I'm excluding passive investment in mutual or hedge funds for the sake of argument, but I'm not sure whether they produce sufficient results to count as "reintroducing" money into the market.