Order Types and Execution
Knowing when and how to use different order types is not a minor detail — it directly impacts your entry price, slippage, and risk management.
Why Order Types Matter
The difference between a market order and a limit order at the wrong moment can cost you 5–15 pips in slippage. During major news events, the cost can be 50+ pips. Understanding which order type to use — and when — is a component of execution edge that most traders ignore entirely.
Market Orders
A market order fills immediately at the current market price. It guarantees execution but not price — in fast markets, you may experience slippage (filling at a worse price than quoted). Market orders are appropriate when:
- You need certainty of entry above certainty of price
- The market is highly liquid (London/NY session, major pairs)
- You are entering on a strong momentum signal that may not wait
Limit Orders
A limit order fills only at your specified price or better. A buy limit is placed below the current market price (you expect price to pull back to your level before going higher). A sell limit is placed above the current market price. Limit orders guarantee price but not execution — if price does not reach your level, the order will not fill.
Limit orders are the preferred entry method for price action traders who want to enter at specific retracement levels rather than chasing moves.
Stop Orders (Buy Stop / Sell Stop)
A stop order becomes a market order when price reaches your trigger level. Buy stops are placed above the market (used to enter breakouts); sell stops are placed below the market. Stop loss orders are a specific use of the sell stop — they exit a long position if price falls to your risk level.
Stop-Limit Orders
A combination of stop and limit — when the stop price is triggered, a limit order is placed at your specified limit price. This prevents slippage on the stop trigger but risks non-execution if price gaps through your limit level. Used more commonly in equities than forex.
OCO Orders (One Cancels the Other)
OCO orders pair two orders such that if one fills, the other is automatically cancelled. Common use: place a buy limit below current price AND a buy stop above current price on a ranging pair — whichever breakout direction fires, the other order cancels. Efficient for bracketing setups where direction is uncertain.
Execution Quality: Slippage and Requotes
Slippage occurs when your fill price differs from the quoted price — common during news events, market opens, and in low-liquidity periods. Requotes occur on market maker platforms when the quoted price changes before your order is processed and the broker asks if you want to fill at the new price.
ECN accounts with direct market access typically minimize both. Track your average slippage over time — consistent negative slippage is a sign of poor execution environment or suboptimal order placement.
Every order type has a purpose. Using a market order when a limit order would serve you is giving away edge on every entry.