The ASK is the price listed on the right of the spread. It is the price someone is willing to sell to you, so if you put in a limit order (always do) at that price it is likely to get filled.With a limit order your broker is trying to get that price or lower, so you might get it for less. However if you are talking about large amounts of shares, it could take time or you may have to move your price higher. The BID is the price on the left and is what people are saying they would buy at this price, but if there is no seller for that price, it will not get filled.