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limit order to buy an etf placed at ask price and ask price suddenly rises

I have noticed that frequently when I place a limit order to buy an etf during trading hours at the ask price the ask price will immediately rise and my order doesn't go through. I am using the Fidelity trading platform. Has anyone else found this to be a problem. Why does it happen and how does one avoid it.


  • markdmarkd ✭✭✭
    I would ask Fidelity, but it's possible placing your order refreshes the screen you see. The screen may not be refreshing on its own every time the ask changes. I don't think your order is doing it, especially if it is a commonly traded etf. Not sure why it always goes up instead of down.
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