Look at the Profit and loss account reserve. It's their first period of trading, they started with P&L reserve being zero, so they made a profit of $833k, possibly more if dividends have been declared/paid.
They must
surely have taken some profits out over that year.
They couldn't just ignore the BTC holding tho, therefore it must have been included in 'cash in bank' position, which is not incorrect imho, despite the name 'cash...' it can also include cash equivalents.
If they did that, they took quite a bit of liberty in their reporting...
They had to pick a price to convert BTC to USD, and on 2013-10-31 the price varied from 195.10 to 203.75. Which one? (OK, they are not required to say, apparently.)
Also it would be ironic for them to call the blockchain a "bank"
Let's round the price to 200 USD/BTC. Then, if that number includes the bitcoins, they held at most 330'000 BTC on that day, probably only some fraction of that. Just for comparison, on that day, their trade volume was 13741 BTC, MtGOX's was 4608 BTC. Hm...