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You don't need to place multiple orders though. You can just pop it in the system as a single sell LMT and it will take care of it x shares at a time as per market demand. I think most platforms are default to hide order size. Mine puts all orders as 100x shares.
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I use Vanguard and they will break your trade up for you. I may only sell 50% at the top, but they will continue to sell the remaining 50% on my behalf, even if that means I don’t maximize my theoretical profit. They’re quicker at executing than me angrily selling.
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