Why a limit order is not a fill
The ticket is still open. Buy 400, limit 27.10. No fill stamp. No time of sale. It sits on the book the way a card sits in a shop window: a price you will take if someone else walks up. That is a limit order. It is not a fill. It is not a reservation. It can sit there until the close and never become a trade.
People treat the number like a hold. They think 27.10 is theirs. They think the shares are waiting in a drawer. The book does not work that way. A limit is a bid or an offer you posted. A fill is the moment another order agrees to meet it.

It waits for a counterparty
A buy limit at 27.10 says you will pay 27.10 or better. It does not say a seller has to appear at 27.10. If the live ask is 27.26 and stays there, your ticket watches. The last sale can print 27.18 all afternoon. Those prints belong to other people. Your card is still a card.

A market order consumes what is already showing. A limit order names the worst price you will accept and then waits. Waiting is the feature. It is also why the ticket can stay blank.
“Or better” is the small mercy people forget. A buy limit at 27.10 can print at 27.08 if a seller is willing. It cannot print at 27.26. The limit is a ceiling on what you will pay, or a floor on what you will take. It is not a request to be filled at the last sale.
Reserved is the wrong word
Nothing is held for you. The 400 shares you want are not tagged with your name. Size on the offer can vanish. Size at your own price can get there first. If two buy limits sit at 27.10, time and the rules of the book decide who meets the next seller. You can be second and still stare at an unfilled ticket.

A limit can fill in pieces. One hundred now, three hundred still working. That partial is a fill for 100. It is not a fill for 400. The rest is still a wish with a number on it.

Blank at the close is a result
Day orders die when the session dies. Good-till-canceled orders live longer, and they can still die of a price that never prints. Either way, an unfilled limit is not a broken machine. It is the book telling you nobody took the other side at your number.
You can cancel it. The clerk can cancel it. The price can walk through your number after you pull the ticket. None of those events mint a fill you did not get.

A dull pass. Last sale: 27.18. Live bid: 27.10 for 200, then your 400 behind it. Live ask: 27.26 for 300. You are not “in at 27.10.” You are in line at 27.10. If a seller hits 27.10 for 200, the first bid gets it. Your 400 can still be sitting there at 3:59.

The filled stamp is the trade. The limit is the invitation. Do not confuse the card in the window with the sale.
Educational only · Not investment advice