What is legging in?
In one line: Legging in means entering a trade that has two or more parts, such as shares and a call, as separate orders one after another instead of as one combined order.
How it works
Many trades have more than one part, or "leg." A buy-write has two: buy 100 shares and sell a call on them. A roll has two: buy back the old option and sell a new one.
You can send the legs together as one order, or one at a time. One at a time is legging in. Closing the same way is legging out.
People leg in to try for a better price on each part. The catch is the gap between fills. Until the last leg fills, you hold a different trade than you planned, and the market keeps moving.
An example (hypothetical)
You plan a Buy-write on XYZ (an illustration, not a trade idea). The stock is at $50. The 30-day $55 call is bid at $1.00. You buy the 100 shares first and wait, hoping the call ticks up to $1.10.
By the afternoon, XYZ has dropped to $46. The $55 call is now bid at $0.30. You sell it anyway.
| XYZ at expiry | One combined order (call at $1.00) | Legged in (call at $0.30) |
|---|---|---|
| $56 | +$600 | +$530 |
| $50 | +$100 | +$30 |
| $46 | −$300 | −$370 |
| $40 | −$900 | −$970 |
The gap cost $70 on every row. But look closer. The real damage happened in those few hours. You held 100 shares with nothing on them while they fell $400. The call you finally sold covers just $30 of it.
At $40, you're down $970. The plan was a covered call. What you actually had all morning was plain stock, and that's what the market charged you for. A math example, not a promise.
Rolls work the same way. Buy back an option first, and if the stock moves before you sell the new one, the new premium can be far from what you planned.
Why it matters for sellers
Most brokers let you send a buy-write or a roll as one combined order with a single net price. The legs fill together or not at all. That closes the gap. In the wheel strategy, that's usually the simpler choice.
If you do leg in, keep the gap short. Decide the worst price you'll accept for the second leg before you place the first. Wide spreads make legging in tempting, and riskier; our page on Options liquidity shows how to check them.
Questions
Is legging in ever better?
Sometimes a patient leg gets a slightly better price. But you're betting the market holds still while you wait, and you can lose more than you save.
Can a combined order fail to fill?
Yes, if your net price asks too much. Then nothing happens, which is the point: no half-built trade.
What is legging out?
Closing the legs one at a time. It has the same risk in reverse. You can be left holding shares without the call, or a call without the shares.
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