Microsoft closed at $525.18 on October 5, 2026, so 100 shares cost $52,518. A January 2027 525 call bought and a 525 put sold against it produced almost exactly the same profit and loss for about $13,800 of capital. That combination is a synthetic long stock. It is the cleanest form of leverage in the options market, and it is easy to misuse. If the pricing relationship behind it is new to you, start with put-call parity and synthetics.
What is a synthetic long stock position?
A synthetic long stock is a long call and a short put on the same stock, with the same strike and the same expiry. Above the strike the call pays off; below it the put costs you. Put together, the payoff at expiry is a straight line, exactly like shares.
| Leg | Delta | Above 525 at expiry | Below 525 at expiry |
|---|---|---|---|
| Long 525 call | +0.56 | Gains $1 per $1 | Expires worthless |
| Short 525 put | +0.44 | Expires worthless | Loses $1 per $1 |
| Synthetic long | +1.00 | Gains $1 per $1 | Loses $1 per $1 |
The deltas add up to 1.00 at every stock price, not just today. That is the difference from a single long call, whose delta drifts with the stock. With a synthetic, one contract is always worth about 100 shares of exposure.
How much capital does a synthetic long save?
Typically 70–80% of the cash needed for the shares, and about half of what a margin loan requires. You pay for the call in full, collect the put premium, and post margin on the short put.
- Buy the January 15, 2027 525 call for about $33.18.
- Sell the January 15, 2027 525 put for about $28.20.
- Net debit: $4.98 per share, or $498 per contract.
- Margin on the short put: 20% of $52,518 plus the $2,820 premium, about $13,306 under the standard method in FINRA Rule 4210.
- Total capital tied up: about $13,804, or 26% of the cash price.
Brokers set their own “house” requirements on top of the rule minimum and often raise them for a single large position or after a big move, so check yours before relying on these numbers. In an IRA, where short puts must be cash secured, a synthetic saves almost no capital.
What does a synthetic long really cost?
The cost is interest on the strike price minus the dividends you give up, which put-call parity builds into the option prices. It is roughly what a large bank would charge to finance the shares.
Compare the two positions at expiry. With shares, you paid $525.18 and collect the $0.98 dividend (ex-date November 19, 2026). With the synthetic, you effectively buy at the 525 strike plus the $4.98 net debit, or $529.98, and get no dividend. The synthetic looks $5.78 per share more expensive. But you didn’t spend about $520 per share on the stock. Held in Treasury bills at 4% for 101 days, that cash earns about the same $5.78. That is put-call parity at work: call − put = stock − present value of strike − present value of dividends.
A synthetic long is cheaper than a margin loan whenever your broker’s margin rate is above the rate built into the options, which is close to the Treasury bill rate. Retail margin rates are usually several points higher. That gap is the real saving, provided you invest the freed cash safely.
How does leverage change your returns?
The dollar profit or loss is almost identical to owning 100 shares, but the percentage return on the capital you put up is three to four times larger, in both directions.
| Microsoft on Jan 15, 2027 | Cash shares | Synthetic long |
|---|---|---|
| $580 (+10%) | +$5,580 (+11%) | +$5,002 (+36%) |
| $525 (flat) | +$80 (0%) | −$498 (−4%) |
| $470 (−10%) | −$5,420 (−10%) | −$5,998 (−43%) |
The flat-stock row shows the carry: the synthetic loses the net debit if nothing happens, while the shares earn the dividend. Add back the interest on the cash you didn’t spend and the two are close to even. The bottom row is the one to plan for. A 10% move in a mega-cap stock over three months is ordinary, and on a fully leveraged synthetic it costs more than 40% of the capital at risk, before any margin increase from your broker.
What happens to a synthetic long in a sell-off?
The short put moves into the money, its margin requirement rises, and your broker can demand more cash or close the position. That is the main practical difference from owning shares outright.
If Microsoft fell to $470, the 525 put would be $55 in the money. Margin under the standard method would rise to roughly 20% of $47,000 plus the put’s value of at least $5,500, or more than $14,900 before any house add-on, while your position has already lost about $6,000. In a fast market a broker may liquidate at the worst moment. Shares bought for cash can simply be held; that staying power is worth something.
The short put is American style, so it can be assigned early once it is deep in the money and its time value is small. Assignment turns your synthetic into real shares bought at the strike, paid for in cash or on margin the same day. See early assignment risk.
How does a synthetic long compare with LEAPS or a poor man’s covered call?
A synthetic long gives full stock-like exposure with no time decay to speak of, while a long call or LEAPS caps your loss at the premium but makes you pay time value. A poor man’s covered call adds income on top of LEAPS exposure.
Pick by what you need: a synthetic for cheap, symmetrical exposure you will actively monitor; a LEAPS call when you want a known maximum loss; shares when you want dividends, votes and the ability to sit through a drawdown. For a stake you already own and want to protect, flip the logic: a short call plus a long put on top of your shares is a collar, which is a synthetic short layered over your stock.
When does a synthetic long make sense?
It makes sense for temporary, deliberate exposure where capital efficiency matters more than simplicity.
- Bridging a cash gap: you want exposure now but the cash from a bonus, vesting or a sale settles later.
- Rebalancing without selling: you want more of a mega-cap name inside a portfolio without selling other holdings and realizing gains.
- Cheap financing: institutions use synthetics and similar trades to hold exposure at near-Treasury rates instead of paying retail margin rates.
It rarely makes sense when the stock pays a meaningful dividend you want, when you can’t monitor margin daily, or when you are tempted to use the freed capital to stack up more exposure than you could afford in shares.
What should you check before opening a synthetic long?
- Decide the share-equivalent exposure first: one contract = 100 shares, regardless of the cash it uses.
- Confirm your options approval allows naked puts and get your broker’s actual margin requirement.
- Check the net debit against the stock price minus the strike’s present value; a large gap means stale quotes or a mispriced dividend.
- Note the ex-dividend dates before expiry; you won’t receive them, and they raise early-assignment risk on the short put if the stock falls.
- Hold enough cash to meet a margin call after a 20% drop.
- Plan the roll: close or roll both legs together at least a week before expiry.
Frequently asked questions
What is a synthetic long stock position?
A synthetic long stock position is a long call and a short put on the same stock with the same strike and expiry. The combined position has a delta of about 1 per share, so it gains and loses roughly one dollar for each dollar the stock moves, just like owning 100 shares per contract, without paying for the shares.
Is a synthetic long cheaper than buying the stock?
It needs much less capital but is not free. The net option cost reflects interest on the strike price minus the dividends you give up, which is the same carry you would pay to finance shares at roughly the Treasury bill rate. On Microsoft at the October 5, 2026 close, the position tied up about 13,800 dollars of margin and debit instead of 52,500 dollars of cash.
What is the risk of a synthetic long stock?
The risk is the same as owning the stock: losses grow dollar for dollar as the stock falls, down to the strike price. Because the capital committed is smaller, the percentage loss on that capital is much larger, and a sharp drop can trigger margin calls on the short put.
Do you get dividends with a synthetic long?
No. Option holders do not receive dividends or voting rights. Expected dividends are priced into the options, so the call is cheaper and the put more expensive than they would be without a dividend. A dividend increase after you open the position works against you.
How much margin does a synthetic long need?
The long call is paid in full. The short put is margined under exchange and FINRA Rule 4210 methods, typically 20 percent of the stock's value minus any out-of-the-money amount plus the put premium, with a minimum of 10 percent of the strike. Brokers can and often do require more, especially for concentrated positions.
What is the difference between a synthetic long and a risk reversal?
A synthetic long uses the same strike for the call and the put, so it behaves exactly like stock. A risk reversal uses an out-of-the-money put and a higher out-of-the-money call, which leaves a band in the middle where the position does not gain or lose, and is often set up for zero net cost.
Key takeaways
- A synthetic long is a long call plus a short put at the same strike and expiry: delta about 1, like 100 shares per contract.
- Its price is set by put-call parity, so the net cost equals the stock price minus the present value of the strike and dividends.
- On Microsoft it tied up about 26% of the cash needed for shares, cheaper than a margin loan at typical broker rates.
- The leverage cuts both ways: a 10% fall cost 43% of the capital committed in our example, and margin calls can force you out.
- You give up dividends and votes, and you must roll the position before each expiry.
- Use it for temporary or tactical exposure; for concentrated stock you already hold, the reverse trade, a collar, is usually the tool.
Sources and method
- OCC, Characteristics and Risks of Standardized Options — synthetic positions, exercise and assignment
- FINRA Rule 4210, Margin Requirements — margin on short puts and stock
- FINRA Rule 2360, Options — options account approval levels
- Cboe Options Institute — synthetics and put-call parity education
- Microsoft, quarterly dividend increase (September 15, 2026) — $0.98 dividend, ex-date November 19, 2026
Microsoft’s October 5, 2026 close of $525.18 is from TradingView. Option prices are Black–Scholes estimates for the January 15, 2027 525 strike (101 days) at an assumed 28% implied volatility and 4% rate, with the $0.98 quarterly dividend Microsoft declared on September 15, 2026 (ex-date November 19). Short-put margin uses the standard 20%-of-underlying method; your broker may require more. The 8% margin-loan rate is an assumption. All results are illustrative.