Buy Stop

A buy stop is an order that sits above the current market price and activates as a market buy order when the market trades at or through the specified price. Until triggered, it rests passively; once the stop price is hit, it converts to a market order and fills at the next available price.

Two uses of buy stops

1. Protective stop (short position) A trader who is short needs a buy stop above their entry to limit losses. If they sold ES at 5,240 and placed a buy stop at 5,248, the position automatically closes if price rallies 8 points: limiting the loss to 8 points per contract ($400 on ES).

2. Breakout entry A trader who wants to buy a breakout above resistance can place a buy stop at the breakout level. If ES is holding at 5,245 resistance, a buy stop at 5,245.25 enters the trade automatically when the breakout occurs: without requiring the trader to be watching in real time.

Buy stops and stop runs

Buy stops cluster predictably above swing highs, resistance levels, and round numbers. Large participants and algorithms know this. A push above a key level that triggers clustered buy stops creates a burst of market buy orders: which the initiator may be selling into.

This is why a spike above resistance on thin tape that immediately reverses is often a stop run: the buy stops were triggered to provide liquidity to sellers, not to initiate a genuine breakout.

Buy stop vs buy limit

Order type	Placement	Triggered by
Buy stop	Above market	Price rising to stop level
Buy limit	Below market	Price falling to limit level

Buy stops get progressively worse fills as price moves: they fill at the market after triggering. Buy limits get better fills (price must come to them). Breakout traders use stops for entry; value traders use limits.