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by 1e-9 2443 days ago
> I didn't get the sense that it is illegal from the book. Could you please elaborate what you understand by front running and why/how is it illegal.

Front running involves placing a trade based on nonpublic information. It's a type of insider trading that has been going on for at least hundreds of years and it has nothing to do with HFT. The classic example is a broker placing orders ahead of their own clients in order to profit off the market's reaction to the client orders.

An HFT system placing orders based on public data feeds is not front running.