Synthetic Long Stock

What is Synthetic Long Stock?

A synthetic long stock position is created by buying a call and selling a put at the same strike price and same expiration. This combination mimics owning 100 shares of the stock. As the stock goes up, the call gains value. As the stock goes down, the short put loses value (just like stock would). The profit and loss profile is nearly identical to owning shares.

Why would you do this instead of just buying the stock? Capital efficiency. A synthetic long position requires much less upfront capital than buying 100 shares. You can use the freed-up capital elsewhere. It is commonly used by institutional traders to get stock-like exposure without tying up full capital.

How to Set It Up

Buy 1 call at the ATM strike
Sell 1 put at the same ATM strike
Same expiration for both
Strike selection: Use the at-the-money strike for the closest replication of stock. You can use slightly OTM strikes to reduce cost but it changes the breakeven.
Expiration: Longer-dated options give you more time. 60-120 days or longer is common.
Net cost: Often close to zero or a small debit/credit. ATM call and put prices are usually close to each other.

The position moves dollar-for-dollar with the stock (approximately 100 delta combined).

When to Use This Strategy

Use synthetic long stock when:

You are bullish on the stock and want stock-like exposure
You want to conserve capital compared to buying shares
You want leveraged exposure to the stock price
You are executing an arbitrage or conversion strategy
You need to quickly establish a stock-like position without buying shares in the market

The synthetic long is not commonly used by retail traders because the short put carries assignment risk and margin requirements. But it is an important building block in options theory and is popular with professionals.

Example Trade

Stock XYZ is trading at $100. You want stock-like exposure.

Buy 1 XYZ $100 call for $4.00
Sell 1 XYZ $100 put for $3.80
Net debit: $4.00 - $3.80 = $0.20 ($20 total)

Versus buying 100 shares at $10,000, your cash outlay is $20 plus margin requirements.

If XYZ goes to $110: The call is worth $10 (+$1,000). The put expires worthless. Profit: $1,000 - $20 = $980. Same as owning shares minus the $20 cost.

If XYZ drops to $90: The call is worthless. The put costs you $10 (-$1,000). Loss: $1,000 + $20 = $1,020. Same as owning shares plus the $20 cost.

If XYZ stays at $100: Both options expire worthless (or close to it). You lose the $20 debit. If you owned shares, you would have broken even.

Risk and Reward

Max profit: Unlimited. The call has no cap on how high the stock can go.
Max loss: (Strike + net debit) x 100. If the stock goes to zero, you are obligated to buy at the strike via the short put and your call is worthless. In our example, max loss is $10,020.
Breakeven: Strike + net debit. $100 + $0.20 = $100.20. Almost identical to buying the stock at $100.

The position has approximately the same risk profile as owning 100 shares, but with the added element of expiration. When the options expire, you need to roll or close the position.

Tips and Common Mistakes

You do not receive dividends. The stock pays dividends to shareholders, not to synthetic holders. This is the main cost of the synthetic versus actual shares.
The short put can be assigned early. Be prepared for this, especially near ex-dividend dates.
Margin requirements still apply. Your broker will require margin for the short put, so the capital savings are not as extreme as they seem.
Roll before expiration. If you want to maintain the position, roll both legs to a new expiration before the current one expires.
This is a building block. Many complex strategies are built by adding legs to a synthetic long or short stock position.

Related Strategies

Long Call — just the bullish side without the short put
Short Put — just the put-selling side without the long call
Collar — add a protective put and covered call to stock (or synthetic stock)