If you need to edit or cancel an order, you can do so up until a certain time depending on the type of order you've placed.
- Fractional shares can typically be edited or canceled until 2:30 pm EST.
- Market orders can only be edited or canceled if the order was placed outside of market hours. Market orders placed while the market is open will complete immediately and show under completed transactions.
- Limit orders can be edited or canceled, only if the trade price hasn't been reached yet.