L5 means that the trade is late (which we can obviously see) and...

L5 means that the trade is late (which we can obviously see) and XT means it is a cross trade, same broker on either side of the trade.

So to put that in context for the two options we have had floating around.

If the share price action over the last two weeks (and particularly last week) has been some kind of attempt at initiating a VWAP based activity then this could be as simple as the aggressor shuffling shares from one account to another via their broker to decrease VWAP even further (particularly if today was the last day).

The other option is that this is legitimately someone selling down their holding. After the late trade I give this less credibility though. Ask yourself this. If it was as simple as the seller going to their broker and saying they wanted to offload 6m shares and their broker could find buyers for that much stock, why would you have been dumping into the market for a week? You would be trying to do off market trades in order to get the best price and not move the market wouldn't you?