I have had incredible opportunities to know and work with these types. I caught this thread and had to contribute. Thanks for the thread CyjackX
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The naked eye can pick up nuances and differences in how the level I data is flowing into the market. It’s a combination of pace, active volume (market orders), absorption of market orders (limit orders) and reactive orders (what comes in after large market orders come in). In addition to these factors, the actual refresh rate of the DOM you are watching will also come into play. Uptrends have tendencies, down trends have tendencies, and transitions from one to the other have tendencies. It takes some dedicated studying and no assumptions going in, but the futures market can be traded this way. I can’t speak for stocks.
What's the difference between placing an order to buy, then cancelling it to place a sell order to get a better price, and placing an order to buy, then cancelling it to place a sell order because you changed your mind about which way the market was moving ? Objectively, I mean.
Haha I have no idea what the law reads, but I would think it would come down to your subjective intent, and whether it was reasonable. If there is just one trade and you said, "oh the market moved the other way, so I changed my mind and also went the other way", seems hard for them to prove. But if you have months or years of placing huge buy orders slightly below market, placing sell orders once your buy orders caused the market to move, then cancelling the buy orders, with the buy orders almost never getting filled but the sell orders regularly getting filled, or vice versa, I would guess a trier of fact could conclude that you were spoofing the market.