I am a 20 year old investor, so far my trading account is quite small (~10k) so I haven't made many large trades, most have been worth a couple thousand dollars.
I noticed in my broker (TD Web Broker) that after I place a sell trade that the fill status on my trades gets completed 100% fill status immediately after I place the trade. So if I sold 50 shares, 50 of those shares gets filled immediately and sold after I finalize the trade.
I can't help but wonder what will happen when my trades start increasing in value and whether or not they will get sold to completion the day of the trade.
My question: Do trades always get filled immediately, and if not what kind of price of a trade would see not being filled completely immediately?
This might be somewhat variable depending on someone else buying the shares you are selling, but in general what would be the constraints of the question I'm asking?