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I don't think he was alone...considering he was given a plea bargain.
A few big whales can shift market. It's the hedge funds that are the real big players.
The claim was that he did it because he noticed others doing it, reported it (multiple times), and when that was ignored incorrectly took it as confirmation of the legitimacy of fake/ghost orders.
Apparently he also lost all his money to Ponzi scams.
FWIW I think the same.
That the guy from Hounslow managed to manipulate the trackers in an index is interesting though.