Options
With options, you can be right about direction and still lose 100% of the premium you paid. Read this before trading one.
12 min read · intermediate · lesson 4 of 6
What this covers
- Define a call, a put, a strike, an expiry and moneyness
- Split a premium into intrinsic and extrinsic value
- Name what delta, theta, vega and gamma each measure
- Explain the three ways a directionally correct option position loses
- Separate expiration break-even from profitability before expiration
- Distinguish a long option from an uncovered short option
The contract
- Call
- A contract giving the holder the right, not the obligation, to buy the underlying at the strike under the contract's exercise terms. Its value generally benefits from a rise in the underlying, all else equal.
- Put
- A contract giving the holder the right, not the obligation, to sell the underlying at the strike under the contract's exercise terms. Its value generally benefits from a fall in the underlying, all else equal.
- Strike
- The price at which the underlying can be bought or sold if the option is exercised.
- Expiry
- The date the contract ends. At expiration, an option with no intrinsic value expires worthless.
- Premium
- The price the buyer pays and the seller receives. For a standalone long option the premium paid is generally the maximum loss; for a standalone short option the premium received is the maximum profit from the option itself.
- Moneyness
- Where the strike sits against the underlying price. In the money carries intrinsic value now, at the money sits near the current price, out of the money carries none.
What the premium is made of
A premium is intrinsic value plus extrinsic value, and keeping the two apart explains most option behaviour.
Intrinsic value is what the option would be worth if exercised immediately. With the underlying at 108, a call struck at 100 carries 8 of intrinsic value. An out-of-the-money option has zero intrinsic value.
Extrinsic value is the remainder, attributable to factors such as the time left and the volatility expected within it. At expiration an option has no remaining extrinsic value, and the decline is not linear: it becomes faster as expiration approaches.
An out-of-the-money option is extrinsic value only. If it remains out of the money at expiration, its intrinsic value is zero and it expires worthless.
What moves a premium
- Delta, the direction sensitivity
- The approximate change in the option's price for a one-unit move in the underlying, all else equal. Delta itself changes as the underlying moves, and is small for far out-of-the-money contracts, which is why a small favourable move can leave the premium barely changed.
- Theta, the time sensitivity
- The option's sensitivity to the passage of time, all else equal. It generally works against long option positions and generally in favour of short ones, and becomes increasingly important as expiration approaches.
- Vega, the volatility sensitivity
- How sensitive the premium is to a change in implied volatility. Vega is the sensitivity, not the volatility itself. A decline in implied volatility can hurt a long option even when the underlying moves in the expected direction.
- Gamma, the rate of change of delta
- How quickly delta changes as the underlying moves. It becomes especially important for near-the-money contracts as expiration approaches, because delta can shift quickly over a small move.
Three ways a correct direction still loses
Time
A buyer can be right about direction and still lose when the move arrives too slowly for the life left in the contract. The option is a claim with a deadline, and the deadline does not move.
Implied volatility
A long option can lose value when implied volatility falls far enough to offset a favourable move in the underlying. Scheduled events are the common example, because expectations priced in beforehand are resolved afterwards.
Distance
A move in the right direction that stops short leaves too little for the contract to recover its cost. Where that line sits depends on whether the position is held to expiration, which is the distinction below.
Break-even at expiration is a different question
Expiration break-even is not the same as the price required for the option to show a profit before expiration.
At expiration a long call breaks even at strike plus premium paid, and a long put at strike minus premium paid. Those are the levels where intrinsic value alone covers the cost.
Before expiration the contract can be profitable without reaching either, because extrinsic value may remain. A long call bought at 2.00 can be worth 3.00 with the underlying still below the strike, if enough time and expected movement are left.
Reading the first as the second is a common and expensive error: it treats a position as hopeless when it is not, or holds one to expiration that could have been closed for a profit.
Implied volatility is embedded in the price, not a directional forecast
Implied volatility is the level of volatility implied by current option prices. It describes how much volatility the option market has embedded in the premium. It carries no view on whether the underlying rises or falls.
Higher implied volatility generally corresponds to more expensive premium, all else equal, and lower implied volatility to cheaper premium. Buying an option is buying exposure to volatility as well as to direction.
One useful context is where current implied volatility sits against its own history. But high implied volatility does not by itself mean an option is overpriced; the market may be pricing a genuine increase in expected uncertainty. The same holds in reverse: cheap by historical standards is not the same as underpriced.
Scheduled events and IV crush
Expected volatility commonly rises into a scheduled event, because the outcome is unknown. Earnings, central bank decisions and major economic releases are the usual cases.
Event-related implied volatility often falls sharply once the uncertainty is resolved, a move commonly called IV crush. It is common rather than guaranteed, and its size varies with how much was priced in beforehand.
When it happens it can cost a long option more than a favourable move in the underlying returns. The event resolving is what removes the value, whichever way it resolved.
Long option against uncovered short option
| Long option | Uncovered short option |
|---|---|
| Maximum loss is generally the premium paid. | Risk depends on the contract, and can be very large. |
| Time decay generally works against the position. | Time decay generally works in its favour. |
| Can benefit from a favourable move, rising implied volatility, or both. | Can benefit from time decay, falling implied volatility, or both. |
| Risk is defined at entry. | Risk can be theoretically unlimited on a call. |
Defined and undefined risk
A defined-risk position has a known maximum loss before it is opened. Buying a call or a put is the simplest case: the premium paid is the loss, and nothing can make it larger. Defined-risk spreads reach the same result by pairing a short option with another option that caps the maximum loss.
Uncovered selling is where the two diverge, and the two sides are not symmetric. An uncovered short call carries theoretically unlimited loss potential, because the underlying can keep rising with no ceiling. An uncovered short put carries substantial but finite downside, because the underlying can fall no further than zero.
Not every sold option carries unlimited risk. What matters is the contract and whether anything caps the obligation.
The rule underneath all of it: know the worst case in currency terms before opening the position. If it cannot be stated, the position is not understood well enough to hold.
Assignment, settlement and expiry
Assignment converts a short option into a position in the underlying at the strike, at the size the contract specifies rather than a size chosen at the time.
If the account lacks the buying power or margin to carry that position, the broker may take risk-management action, including closing or liquidating positions. Broker policies differ, and the outcome is not identical everywhere.
Settlement differs by contract. Some are physically settled and deliver the underlying; others are cash settled. Exercise style differs too: American-style options can generally be exercised before expiration, European-style options generally only at expiration. Both are contract specifications published by the exchange.
Expiry arrives on a schedule and does not wait for a thesis to work out. A position held to expiration resolves against whatever the underlying is doing that day.
Chains are not uniformly liquid
A chain lists many strikes across many expirations, and liquidity varies dramatically across it: by underlying, by expiration and by strike. Near-the-money contracts on heavily traded underlyings are usually the tightest. Distant strikes and less active expirations frequently are not.
Four things are worth checking before opening: the bid-ask spread, the volume, the open interest and the quoted size available, where the platform shows it.
Open interest alone does not guarantee that a contract is liquid at the price you want. It counts positions already held, not what can be traded now.
A wide spread is a real cost, paid on entry and again on exit, before the position has done anything.
Right on direction, wrong on the trade
IllustrativeAll figures are illustrative.
A stock trades at 100. You buy a call struck at 105 expiring in 30 days, paying 2.00 in premium. Intrinsic value is zero and extrinsic value is 2.00, because the strike sits above the current price.
Three weeks later the stock is at 104. The direction was correct.
The call is still out of the money, most of the remaining life has gone, and implied volatility may have changed as well. The contract could be worth substantially less than the 2.00 paid, perhaps 0.40 on a hypothetical basis. The exact premium would depend on remaining time, implied volatility and other pricing inputs.
At expiration with the stock at 104, the 105 call expires worthless and the buyer loses the full 2.00.
The stock itself would have risen 4 percent over the same period. Being correct on direction does not mean the option expression of that view is profitable. The two are also not the same commitment of capital, so the comparison is about the outcome of the view, not the size of the position.
What PecuDesk covers
On the covered equity underlyings the platform reads the chain: implied volatility against realised, the expected move by expiration and how it changes across them, what traded today against what was already held, where open interest concentrates by strike, the hedging posture that follows from it, and the proximity of scheduled earnings.
It states what the chain is pricing. It does not tell you which contract to trade, or whether to buy or sell one. Options are the class where that distinction costs the most, because the same view expressed two ways can produce opposite outcomes.
Key takeaways
- A premium is intrinsic value plus extrinsic value. At expiration, extrinsic value is zero.
- Being correct about direction does not guarantee an option position makes money.
- Time, implied volatility and the size and timing of the move all change what the contract is worth.
- Expiration break-even is not the price required to show a profit before expiration.
- Implied volatility is derived from option prices. It is not a directional forecast.
- A long option generally has defined risk equal to the premium paid.
- Uncovered short risk depends on the contract: a naked call is theoretically unlimited, a naked put substantial but finite.
- Assignment, settlement style and exercise style all change what happens to an open position.
- Chain liquidity varies by strike and expiration, and open interest alone does not measure it.
Common mistakes
- Treating a call as a cheaper way to own the stock.
- Ignoring time decay, and the way it matters more as expiration approaches.
- Buying expensive event premium without accounting for what happens to implied volatility afterwards.
- Assuming a correct directional view guarantees the option position profits.
- Confusing expiration break-even with profitability before expiration.
- Selling uncovered options without understanding the maximum loss, the margin and the assignment mechanics.
- Opening a position in a thin contract where the spread costs several percent each way.
- Reading open interest as a measure of liquidity on its own.
- Holding to expiration without knowing the settlement and exercise terms of the contract.
Knowledge check
OptionalRelated
- StocksAsset Classes
- Position sizing and risk per tradeMarket Foundations