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Can individuals day-trade stocks using High-Frequency Trading (HFT)?
Nobody is going to stop you if you want to try that. But you should keep in mind that you have to invest a lot in getting the best hardware you can lay your hands on, best fail-safe connectivity to the exchanges, best trading algorithms and software that money can buy and loads of other stuff. This all needs quite a big amount of upfront investment without guaranteeing returns. That is why you see institutions with deep pockets i.e. banks and trading firms only involve themselves in HFT.