In a big long-running error like this it is extremely unlikely that a company would have come out on top.
However, it happened fairly regularly that smaller trading errors would cause a couple (or tens of) thousand dollar win or loss for the client. If it was a loss, the client universally complains and gets comped by the company. If it was a win and it is found, the client keeps mum and the company does not raise the issue.
However, it happened fairly regularly that smaller trading errors would cause a couple (or tens of) thousand dollar win or loss for the client. If it was a loss, the client universally complains and gets comped by the company. If it was a win and it is found, the client keeps mum and the company does not raise the issue.