Series D (with 3 seed rounds) and 4 founders....what does the equity shares for each founder look like? 3% maybe?
If they are raising $175M, their dilution is probably in the ~15% range, putting their valuation a bit north of $1B.
So, each founder probably is worth, on paper, around $50M right now. Again, this assumes equal splits. It's possible that the CEO has more shares by virtue of assuming greater responsibilities.