Synthetic Long Stock
Buying a call and selling a put at the same strike replicates long stock exposure without the capital.
Profit / Loss Diagram
Synthetic Long Stock at expiration
What is this strategy?
The Synthetic Long Stock is an options combination that exactly replicates the exposure of owning 100 shares of the underlying. It is built by buying 1 call and selling 1 put, both at the same strike and expiration. The result is price exposure identical to owning 100 shares, without buying the shares directly. It is an effective way to take long exposure with less capital and with more flexible management.
Mathematically, a long call plus a short put at the same strike creates a perfectly linear P&L that rises $1 for every $1 the price rises, exactly like owning stock. If you buy the 180 call and sell the 180 put, your exposure is identical to owning 100 shares of AAPL at $180. If AAPL rises to $200 you gain on both sides; if it falls to $160 you lose on both.
The Synthetic Long is used mainly for <strong>capital efficiency</strong>: you get the long exposure without laying out the $18,000 that 100 shares would cost, paying only the net debit between the call premium and the put premium received. The trade-off is that the sold put obliges you to buy if price falls, so the real risk is almost the same as owning the shares. The small outlay does not reduce the exposure — it merely finances it differently.
Construction
| Action | Instrument | Strike | Expiration | Example |
|---|---|---|---|---|
| BUY | 1 Call | Same strike | Same expiration | +1 AAPL Oct 180 Call |
| SELL | 1 Put | Same strike | Same expiration | -1 AAPL Oct 180 Put |
Example
Scenario: AAPL at $173. You want long exposure but prefer options over buying outright.
- Call Purchased +1 AAPL Oct 180 Call @ $4.50
- Put Sold -1 AAPL Oct 180 Put @ $3.50
- Net Debit +$100 (450 − 350)
- Maximum Gain Unlimited (like owning the shares)
- Maximum Loss $18,100 (180 × 100 + $100 debit), if AAPL falls to zero
- Breakeven $181.00 (180 strike + 1.00 net debit)
- Profit if AAPL = $190 $900 (the $1,000 from the call less the $100 debit)
The Greeks
Delta is roughly +100, identical to owning 100 shares. You gain point for point as price rises.
The long call carries negative theta; the short put carries positive theta. They roughly cancel, leaving it neutral.
The long call’s positive vega cancels the short put’s negative vega. Volatility does not move the position.
The long call’s positive gamma cancels the short put’s negative gamma. Exposure is completely linear.
Position Management
- 01 Treat It Like a Stock Position The synthetic behaves exactly like owning stock. Use the same stops and profit targets you would use for the shares themselves.
- 02 Monitor Assignment When In the Money If AAPL rises the call is in the money and the put is out, so you will not be assigned. If it falls, the put goes in the money and you will be assigned 100 shares at $180.
- 03 Convert to Stock if Assigned If the put is assigned you now own 100 shares. You can hold them, sell covered calls, or exit entirely. Plan in advance.
- 04 Close if You Change Your Mind Unlike stock, which can be awkward to exit, the synthetic is easy to close. Simply buy the put back and sell the call.
- 05 Roll if Needed If AAPL rises significantly you can roll the synthetic to a higher strike, banking gains while keeping long exposure.