XT is a crossing within the brokers office, yet still gets washed through the exchange, thus providing the buyers and sellers with the benefits of the exchange guarantee fund.
When it is a large trade, a broker may have been given an order by an insto to buy or sell a large line of MOF. They then talk to other instos that they think may have an interest in the opposite direction ie sell or buy. They then transact at an agreed price.
You also see XT on small trades. For example, an insto may have a large buy order for example, which the broker is executing via an algorithm, thus the whole order is not on screen. When a new order to sell comes in from another client, and before it hits the screen, it looks internally to cross the trade with any off-screen buy orders.
MOF Price at posting:
14.5¢ Sentiment: Hold Disclosure: Held