This is market manipulation. Not surprising, but there are ways to easily detect this type of behavior to level the playing field for the rest of us. Assuming these were wash trades this trader only lost approx (7.3m+4.2m+3.4m) * $0.14 (cost / IHT) * 0.1% (trading fee) = $2,100 to win the top 3 spots, which at current levels would payout $44,000. Not a bad ROI. Granted you have to keep this up until the competition ends, but still going to easily double or triple your money.

The mismatch between the sum total of rankings 2+3 and ranking 1 can be explained by held inventory that hasn't been transferred to account 1 and sold yet.

"A wash trade is a form of market manipulation in which an investor simultaneously sells and buys the same financial instruments to create misleading, artificial activity in the marketplace." -Wikipedia