How do some people fill their order pre-open with Ig DMA CFD? I...

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    How do some people fill their order pre-open with Ig DMA CFD? I was told this is possible and you can also see order getting filled at pre-open on Iguana Spark.
    They usually close their position at open as soon as the market gap up on good news. I happen to know a trader that does this on a regular basis but it doesnt always work.
    E.g Afterpay released a good business update on 14/4/20
    The previous day close on 13/4 was $22. But on the day of positive news, the indicative price showing on my ANZ shows $24 and that was the open price. But he was filled at $22.30 with massive amount of shares. As soon as APT open at $24, he close his position and booked profit. The low for the day was $23.93 which was nowhere near $22.30
    How is it possible to find a seller at $22.30 with large amount of shares, when clearly the market is bound to open at $24 and the low was no where near his average price $22.30.
 
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