It's High Frequency Trading, or HFT as mentioned by Ninelives,...

It's High Frequency Trading, or HFT as mentioned by Ninelives, BOTS that are programmed to buy and sell minute parcels making only a few cents on each trade if that. Every day they makes millions of trades which amounts to millions of dollars in aggregate.

WA1 is a highly volatile stock with drastic swings intraday which I believe is attractive to their programming and filtering of which stocks to play.

These HFT firms are big players, especially in the US and pay huge money to be right next door to the exchange and have a high bandwidth cable directly into the exchange to have the fastest trades at a millionth of a nanosecond, therefore frontrunning any and all trades to make the most money.

There was one firm in the US that did not have a losing day in years, this was several years ago so that may have changed now.

There's not much point in whinging or complaining about it, I just accept it and move on, being in the right stock over time will render it null and void anyway and provide a little liquidity.