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Options Spreads Explained – A Complete Guide
Every options trader should know what options spreads are and what different types of options spreads exist. If you aren’t completely familiar with options spreads, this article will definitely help you out! After reading this article, you won’t only know what an options spread is. You will also be familiarized with all the different options spreads that exist. This is very powerful because if you fully understand options spreads, you will understand ALL options strategies!
So without further ado, let’s get started.
What Is An Option Spread?
Before we get into the different kinds of options spreads that exist, it is important to understand what an options spread even is. So what is an option spread?
An options spread is an option strategy involving the purchase and sale of options at different strike prices and/or different expiration dates on one underlying asset. An options spread consists of one type of option only. This means that options spreads either solely consist of call or put options, not both. Furthermore, an options spread has the same number of long as short options.
Let me give you a concrete example to make it clear what an options spread is. The following position is an options spread:
- 1 XYZ short call with a strike price of 100 that expires in 40 days.
- 1 XYZ long call with a strike price of 105 that expires in 40 days.
As you can see, the just-described options only differ in regards to strike price and opening transaction (one call option is bought and the other one is sold).
Let’s recap the characteristics of an options spread:
- All involved options are on the same underlying asset (e.g. XYZ).
- All involved options are of the same type (call or put).
- An options spread always consists of the same number of purchased as sold options (e.g. 5 short and 5 long).
In other words, the options involved in an options spread only differ in regards to strike price and/or expiration date. This is the case for all options spreads, regardless of kind. So when I will walk you through all the different options spreads in a few moments, keep this in mind.
Even though the options involved in an options spread only differ in regards to 1-2 aspects, it is still possible to create a wide variety of different options spreads.
Next up, I will walk you through all the different kinds of options spreads: vertical spreads, horizontal spreads, diagonal spreads, credit spreads, debit spreads, bull spreads…
Option Spreads Visually Explained
Watch the following video for a visual breakdown of option spreads:
Different types of options spreads explained
What are vertical spreads?
Vertical spreads are options spreads created with options that only differ in regards to strike price. So basically, a vertical spread consists of the same number of short calls as long calls or the same number of long puts as short puts with the same expiration date (on the same underlying asset).
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This doesn’t leave too many possibilities. That is also why only four different vertical spreads exist, namely bull call spreads, bear call spreads, bull put spreads and bear put spreads.
These four different vertical spreads can be ordered into different categories:
- Bull Spreads: Bullish spreads (that profit from increases in the underlying asset’s price).
- Bear Spreads: Bearish spreads (that profit from decreases in the underlying asset’s price).
- Call Spreads: Spreads that consist of call options only.
- Put Spreads: Spreads that consist of put options only.
- Credit Spreads: Spreads that are opened for a credit (you get paid to open).
- Debit Spreads: Spreads that are opened for a debit (you pay to open).
A bull call spread is a bullish debit spread, whereas a bear call spread is a bearish credit spread. A bull put spread is a bullish credit spread and a bear put spread is a bearish debit spread.
Here is how the four different vertical spreads are set up:
Bull Call Spread (aka. Long Call Spread):
- 1 long call
- 1 short call at a higher strike price (with the same expiration date)
Bear Call Spread (aka. Short Call Spread):
- 1 short call
- 1 long call at a higher strike price (with the same expiration date)
Bull Put Spread (aka. Short Put Spread):
- 1 long put
- 1 short put at a higher strike price (with the same expiration date)
Bear Put Spread (aka. Long Put Spread):
- 1 short put
- 1 long put at a higher strike price (with the same expiration date)
All vertical spreads are defined risk and defined profit strategies which means that you can’t lose or profit more than a certain amount. The amount of risk and potential profit depends on the width of the strikes and on the position of the strikes in relation to the underlying’s price.
To calculate the max risk and max profit of vertical spreads, you need one calculation:
Width of Strikes × 100 − Net Credit or Debit
This calculation reveals the max risk of credit spreads (Bull Put Spreads and Bear Call Spreads) and the max profit of debit spreads (Bear Put Spreads and Bull Call Spreads).
The max profit of credit spreads equals the net credit collected to open, whereas the max risk of debit spreads equals the net debit paid to open.
Vertical spreads are directional strategies which means that they mainly profit from price movement in the underlying asset’s price. That’s also why they are called bull/bear spreads. This means that vertical spreads are a strategy principally used to take advantage of price movement. Nevertheless, implied volatility and time still can influence vertical spreads to a certain extent.
What are horizontal spreads?
Horizontal spreads are options strategies that consist of the same number of long as short options that only differ in regards to the expiration date (on the same underlying asset). In other words, the options involved have the same strike price but a different expiration date.
Let me give you a concrete example to explain what a horizontal spread is:
- 1 long ABC call with a strike price of 50 that expires in 29 days (front-month).
- 1 short ABC call with a strike price of 50 that expires in 57 days (back-month).
Just like with vertical spreads, there only exist four different kinds of horizontal spreads, namely short call calendar spreads, long call calendar spreads, short put calendar spreads and long put calendar spreads. As you may have noticed, all of these spreads are calendar spreads. That is also the reason why horizontal spreads also are referred to as calendar spreads.
The setup of these four different calendar spreads is relatively simple:
Long Call Calendar Spread:
- 1 short call (front-month)
- 1 long call at the same strike price (back-month)
Short Call Calendar Spread:
- 1 long call (front-month)
- 1 short call at the same strike price (back-month)
Long Put Calendar Spread:
- 1 short put (front-month)
- 1 long put at the same strike price (back-month)
Short Put Calendar Spread:
- 1 long put (front-month)
- 1 short put at the same strike price (back-month)
Calendar spreads are mainly used as a strategy to profit from changes in implied volatility and from time decay. For instance, long calendar spreads profit from increases in implied volatility.
Generally, calendar spreads aren’t a very directional strategy. But depending on the strike selection, calendar spreads can be set up more and less directional.
What are diagonal spreads?
Diagonal spreads are a combination of vertical and horizontal spreads. A diagonal spread is a strategy that consists of the same number of long as short options that have different strike prices and different expiration dates.
The options used in vertical spreads only differ in regards to strike price, the options used in horizontal spreads only differ in regards to the expiration date and the options used in diagonal spreads differ in regards to both strike price and the expiration date.
There are many different ways to set up diagonal spreads. But here are a few concrete examples of possible diagonal spreads.
Diagonal spread example 1:
- 1 short XYZ call with a strike price of 185 that expires in 27 days (front-month).
- 1 long XYZ call with a strike price of 190 that expires in 55 days (back-month).
Diagonal spread example 2:
- 1 long ABC put with a strike price of 78 that expires in 20 days (front-month).
- 1 short ABC put with a strike price of 72 that expires in 48 days (back-month).
Just like I said before, diagonal spreads are a combination of vertical and horizontal spreads. This means that they try to profit from changes in both the underlying asset’s price and implied volatility/time. Diagonal spreads can be slightly to very directional strategies.
Recap – Options Spreads Explained
It is very important to understand what an options spread is and what different kinds of spreads exist. That’s why I want to recap some of the most important points of this article.
I created the following table to visually explain the different options spreads. Furthermore, this table actually reveals why the different spreads are called the way that they are (horizontal, vertical, diagonal).
Now you should know what different spreads exist. But you might ask yourself the question, which of these spreads is best.
There is no one right answer to this question. Not one spread is better than another. It really depends on the current market situation and on personal preferences. For instance, if you are bullish on a stock and want to take advantage of an up-move, a bull call vertical spread might be a good strategy. However, if you want to profit from a rise in implied volatility and don’t have a certain directional assumption, a horizontal/calendar spread would probably be a better choice…
I hope you understand what I am trying to say.
But generally speaking, vertical spreads are the simplest of the three. Horizontal and especially diagonal spreads are much more complex due to the different expiration dates of the different options. Therefore, I wouldn’t necessarily recommend trading (horizontal or) diagonal spreads if you aren’t completely familiar with them.
In the introduction, I mentioned that if you fully understand options spreads, you will understand all options strategies. But why do I think this?
The reason why I am saying this is that options spreads are the building blocks of almost all other options strategies. If you combine multiple options spreads, you can create almost any strategy. So instead of trying to understand how these dozens of different strategies work, it is much more efficient to learn how the building blocks of these strategies work.
Let me give you a few examples:
You probably realized that vertical spreads are relatively simple (compared to other options strategies). They are a two-leg strategy that consists of a long call and short call or a long put and short put.
But what happens if we combine multiple vertical spreads?
A new strategy is born! There are four different vertical spreads that can be combined to create a new strategy. I will now give you some concrete examples of what happens when you combine multiple vertical spreads.
You may or may not know the option strategy iron condors. It is a very good and popular four-leg options strategy. Due to its four legs, it is usually labeled as an ‘advanced’ options strategy. But in reality, it isn’t anything else than a combination of two simple credit spreads.
I created the following image to explain this concept visually.
Hopefully, you can see how a combination of a bear call spread and a bull put spread create an iron condor.
Now let me give you another concrete example. Butterflies are another options strategy often referred to as complex and thus, only suitable for ‘advanced’ traders. But just like with iron condors, butterflies aren’t very complicated either. They are simply a combination of a bear call spread and a bull call spread.
Hopefully, these two examples make it clear how options spreads are the building blocks of most options strategies. These were just two of many examples where this is the case.
So in conclusion, options spreads can be thought of as Lego bricks. Just like Legos, options spreads can be combined in many different ways to create whatever your heart desires.
If you want to learn more about options strategies and when to use which strategies, you might want to check out my free strategy selection handbook.
My goal with this article was to introduce you to options spreads and thereby build a stable foundation for options trading strategies. It would be awesome of you to let me know if I achieved this goal in the comment section below!
Furthermore, if you have any questions, feedback or other comments, please tell me in the comment section.
10 Replies to “Options Spreads Explained – A Complete Guide”
Your explanation of the Option Spreads as building blocks to other strategies makes sense, but I am confused by the Iron Condor and Butterfly.
Does the Iron Condor and Butterfly make you money if the underlying asset price does not go over a certain amount or go over and then come back down before expiration?
That’s kind of what it looks like from looking at the graphs you included.
Thanks for your question. Iron condors and butterflies profit if the underlying asset’s price stays in a certain range. The size of this range depends on the strikes selected and the premium received/paid. I hope this helps with clarifying the confusion.
Otherwise, you could check out my article on Iron Condors and Butterflies.
Reading through this very comprehensive article on Option Spreads in Trading was so interesting. For someone new to this world of Trading it would need to be gone through a few times to fully understand all the terminology and nuances of trading. It is really complex for an ordinary person not versed in doing anything like this previously.
To my mind, if you are ready to Trade, you would need to be aware of the risks involved and not be afraid of losses. Only Trade with the amount you can afford, would be my way of thinking. Perhaps am too conservative.
It was very interesting to learn something new. Will take a look at it again at a later stage.
Thanks for the comment Jill. It is completely normal for people new to the world of trading to have trouble understanding everything. That’s actually also why I created a free trading terminology handbook in which you can look up all the seemingly complicated trading terms. So judging from your comment, you could definitely use my free trading glossary.
And no you are not too conservative! You should never risk more than you can afford to lose.
Hi Louis, I have completed your education classes and they are good, and I have learnt a lot. Best of all, I have learnt more from your free education than all the other programs I have paid for. Be leave me I have spent a lot of money on paid sites and it is not worth it. Selling short term options is my goal. However, I am have trouble comprehending receiving a credit when I sell an option. When I sell an option for a credit, I only receive the credit if it expires worthless Right. Thanks for your help
Thanks for the question. I hope I can clarify your confusion. When you sell an option to open a position, you receive a credit. So now you have a negative position open. To close this position, you could either buy back the sold option or wait until expiration. If you buy it back, you will give up some of the received credit. The amount of credit that you give back depends on the option’s price. If it has gone up, you might even have to pay more to close the position than you received when opening it.
If at expiration, the underlying’s price is at the right point, the option might expire worthless and only then, you could keep the entire credit that you collected when putting on the position.
Let me give you a concrete example:
You sell a call option with a strike price of $105 on XYZ which is trading at $100. You receive a credit of $1,50 (so $150). But now you have an open position which has to be closed for you to lock in the profit. As long as the position is open, the profits (or losses) are purely paper profits (or losses). They are only realized if you close the position which you can do by buying back the call option or by waiting until the expiration date.
Let’s say, you buy back the call option for $0,7 two weeks later. This would mean that you have a realized profit of $1,5 – $0,7 = $0,8 (or $80). So you can keep $80 of the collected credit.
If you instead wait until expiration and XYZ’s price is still below $105, you can keep the entire $150 of credit.
I really hope this helps. If you have any other follow-up questions, let me know.
In your reply to Tom looks like you did not mention that at expirations time if the stock price is above the strike price in a short call or below the strike price in short put, he would be forced to buy the stock at the strike price.
Thanks for the comment. Usually, when a trade such as a short call or short put is ITM shortly before expiration, I recommend closing the position for a loss. If you do this, you won’t have to buy or sell any shares at the strike price. I never recommend holding a losing short option position into expiration (unless you want to buy or sell stock at the strike price).
But you are right that if you would hold such a position into expiration, you would have to buy/sell stock at the strike price.
since a call spread would probably be assigned if the stock price goes above the strike price, it seems to me that it would be better to use a put spread when one expects the stock to go up and a call spread when one expects it to go down. Opposite of single options.
Hi and thanks for your comment,
I wouldn’t use assignment risk as a main factor when choosing which strategy to go for. Instead, I recommend looking at different market variables such as implied volatility, time till expiration, underlying asset, and price. Depending on the situation and your market assumption, a bull put spread can be better than a bull call spread and vice versa. The same goes for bear spreads. It depends on the situation.
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Essential Options Trading Guide
Options trading may seem overwhelming at first, but it’s easy to understand if you know a few key points. Investor portfolios are usually constructed with several asset classes. These may be stocks, bonds, ETFs, and even mutual funds. Options are another asset class, and when used correctly, they offer many advantages that trading stocks and ETFs alone cannot.
- An option is a contract giving the buyer the right, but not the obligation, to buy (in the case of a call) or sell (in the case of a put) the underlying asset at a specific price on or before a certain date.
- People use options for income, to speculate, and to hedge risk.
- Options are known as derivatives because they derive their value from an underlying asset.
- A stock option contract typically represents 100 shares of the underlying stock, but options may be written on any sort of underlying asset from bonds to currencies to commodities.
What Are Options?
Options are contracts that give the bearer the right, but not the obligation, to either buy or sell an amount of some underlying asset at a pre-determined price at or before the contract expires. Options can be purchased like most other asset classes with brokerage investment accounts.
Options are powerful because they can enhance an individual’s portfolio. They do this through added income, protection, and even leverage. Depending on the situation, there is usually an option scenario appropriate for an investor’s goal. A popular example would be using options as an effective hedge against a declining stock market to limit downside losses. Options can also be used to generate recurring income. Additionally, they are often used for speculative purposes such as wagering on the direction of a stock.
There is no free lunch with stocks and bonds. Options are no different. Options trading involves certain risks that the investor must be aware of before making a trade. This is why, when trading options with a broker, you usually see a disclaimer similar to the following:
Options involve risks and are not suitable for everyone. Options trading can be speculative in nature and carry substantial risk of loss.
Options as Derivatives
Options belong to the larger group of securities known as derivatives. A derivative’s price is dependent on or derived from the price of something else. As an example, wine is a derivative of grapes ketchup is a derivative of tomatoes, and a stock option is a derivative of a stock. Options are derivatives of financial securities—their value depends on the price of some other asset. Examples of derivatives include calls, puts, futures, forwards, swaps, and mortgage-backed securities, among others.
Call and Put Options
Options are a type of derivative security. An option is a derivative because its price is intrinsically linked to the price of something else. If you buy an options contract, it grants you the right, but not the obligation to buy or sell an underlying asset at a set price on or before a certain date.
A call option gives the holder the right to buy a stock and a put option gives the holder the right to sell a stock. Think of a call option as a down-payment for a future purpose.
Call Option Example
A potential homeowner sees a new development going up. That person may want the right to purchase a home in the future, but will only want to exercise that right once certain developments around the area are built.
The potential home buyer would benefit from the option of buying or not. Imagine they can buy a call option from the developer to buy the home at say $400,000 at any point in the next three years. Well, they can—you know it as a non-refundable deposit. Naturally, the developer wouldn’t grant such an option for free. The potential home buyer needs to contribute a down-payment to lock in that right.
With respect to an option, this cost is known as the premium. It is the price of the option contract. In our home example, the deposit might be $20,000 that the buyer pays the developer. Let’s say two years have passed, and now the developments are built and zoning has been approved. The home buyer exercises the option and buys the home for $400,000 because that is the contract purchased.
The market value of that home may have doubled to $800,000. But because the down payment locked in a pre-determined price, the buyer pays $400,000. Now, in an alternate scenario, say the zoning approval doesn’t come through until year four. This is one year past the expiration of this option. Now the home buyer must pay the market price because the contract has expired. In either case, the developer keeps the original $20,000 collected.
Call Option Basics
Put Option Example
Now, think of a put option as an insurance policy. If you own your home, you are likely familiar with purchasing homeowner’s insurance. A homeowner buys a homeowner’s policy to protect their home from damage. They pay an amount called the premium, for some amount of time, let’s say a year. The policy has a face value and gives the insurance holder protection in the event the home is damaged.
What if, instead of a home, your asset was a stock or index investment? Similarly, if an investor wants insurance on his/her S&P 500 index portfolio, they can purchase put options. An investor may fear that a bear market is near and may be unwilling to lose more than 10% of their long position in the S&P 500 index. If the S&P 500 is currently trading at $2500, he/she can purchase a put option giving the right to sell the index at $2250, for example, at any point in the next two years.
If in six months the market crashes by 20% (500 points on the index), he or she has made 250 points by being able to sell the index at $2250 when it is trading at $2000—a combined loss of just 10%. In fact, even if the market drops to zero, the loss would only be 10% if this put option is held. Again, purchasing the option will carry a cost (the premium), and if the market doesn’t drop during that period, the maximum loss on the option is just the premium spent.
Put Option Basics
Buying, Selling Calls/Puts
There are four things you can do with options:
- Buy calls
- Sell calls
- Buy puts
- Sell puts
Buying stock gives you a long position. Buying a call option gives you a potential long position in the underlying stock. Short-selling a stock gives you a short position. Selling a naked or uncovered call gives you a potential short position in the underlying stock.
Buying a put option gives you a potential short position in the underlying stock. Selling a naked, or unmarried, put gives you a potential long position in the underlying stock. Keeping these four scenarios straight is crucial.
People who buy options are called holders and those who sell options are called writers of options. Here is the important distinction between holders and writers:
- Call holders and put holders (buyers) are not obligated to buy or sell. They have the choice to exercise their rights. This limits the risk of buyers of options to only the premium spent.
- Call writers and put writers (sellers), however, are obligated to buy or sell if the option expires in-the-money (more on that below). This means that a seller may be required to make good on a promise to buy or sell. It also implies that option sellers have exposure to more, and in some cases, unlimited, risks. This means writers can lose much more than the price of the options premium.
Why Use Options
Speculation is a wager on future price direction. A speculator might think the price of a stock will go up, perhaps based on fundamental analysis or technical analysis. A speculator might buy the stock or buy a call option on the stock. Speculating with a call option—instead of buying the stock outright—is attractive to some traders since options provide leverage. An out-of-the-money call option may only cost a few dollars or even cents compared to the full price of a $100 stock.
Options were really invented for hedging purposes. Hedging with options is meant to reduce risk at a reasonable cost. Here, we can think of using options like an insurance policy. Just as you insure your house or car, options can be used to insure your investments against a downturn.
Imagine that you want to buy technology stocks. But you also want to limit losses. By using put options, you could limit your downside risk and enjoy all the upside in a cost-effective way. For short sellers, call options can be used to limit losses if wrong—especially during a short squeeze.
How Options Work
In terms of valuing option contracts, it is essentially all about determining the probabilities of future price events. The more likely something is to occur, the more expensive an option would be that profits from that event. For instance, a call value goes up as the stock (underlying) goes up. This is the key to understanding the relative value of options.
The less time there is until expiry, the less value an option will have. This is because the chances of a price move in the underlying stock diminish as we draw closer to expiry. This is why an option is a wasting asset. If you buy a one-month option that is out of the money, and the stock doesn’t move, the option becomes less valuable with each passing day. Since time is a component to the price of an option, a one-month option is going to be less valuable than a three-month option. This is because with more time available, the probability of a price move in your favor increases, and vice versa.
Accordingly, the same option strike that expires in a year will cost more than the same strike for one month. This wasting feature of options is a result of time decay. The same option will be worth less tomorrow than it is today if the price of the stock doesn’t move.
Volatility also increases the price of an option. This is because uncertainty pushes the odds of an outcome higher. If the volatility of the underlying asset increases, larger price swings increase the possibilities of substantial moves both up and down. Greater price swings will increase the chances of an event occurring. Therefore, the greater the volatility, the greater the price of the option. Options trading and volatility are intrinsically linked to each other in this way.
On most U.S. exchanges, a stock option contract is the option to buy or sell 100 shares; that’s why you must multiply the contract premium by 100 to get the total amount you’ll have to spend to buy the call.
|What happened to our option investment|
|May 1||May 21||Expiry Date|
The majority of the time, holders choose to take their profits by trading out (closing out) their position. This means that option holders sell their options in the market, and writers buy their positions back to close. Only about 10% of options are exercised, 60% are traded (closed) out, and 30% expire worthlessly.
Fluctuations in option prices can be explained by intrinsic value and extrinsic value, which is also known as time value. An option’s premium is the combination of its intrinsic value and time value. Intrinsic value is the in-the-money amount of an options contract, which, for a call option, is the amount above the strike price that the stock is trading. Time value represents the added value an investor has to pay for an option above the intrinsic value. This is the extrinsic value or time value. So, the price of the option in our example can be thought of as the following:
|Premium =||Intrinsic Value +||Time Value|
In real life, options almost always trade at some level above their intrinsic value, because the probability of an event occurring is never absolutely zero, even if it is highly unlikely.
Types of Options
American and European Options
American options can be exercised at any time between the date of purchase and the expiration date. European options are different from American options in that they can only be exercised at the end of their lives on their expiration date. The distinction between American and European options has nothing to do with geography, only with early exercise. Many options on stock indexes are of the European type. Because the right to exercise early has some value, an American option typically carries a higher premium than an otherwise identical European option. This is because the early exercise feature is desirable and commands a premium.
There are also exotic options, which are exotic because there might be a variation on the payoff profiles from the plain vanilla options. Or they can become totally different products all together with “optionality” embedded in them. For example, binary options have a simple payoff structure that is determined if the payoff event happens regardless of the degree. Other types of exotic options include knock-out, knock-in, barrier options, lookback options, Asian options, and Bermudan options. Again, exotic options are typically for professional derivatives traders.
Options Expiration & Liquidity
Options can also be categorized by their duration. Short-term options are those that expire generally within a year. Long-term options with expirations greater than a year are classified as long-term equity anticipation securities or LEAPs. LEAPS are identical to regular options, they just have longer durations.
Options can also be distinguished by when their expiration date falls. Sets of options now expire weekly on each Friday, at the end of the month, or even on a daily basis. Index and ETF options also sometimes offer quarterly expiries.
Reading Options Tables
More and more traders are finding option data through online sources. (For related reading, see “Best Online Stock Brokers for Options Trading 2020”) While each source has its own format for presenting the data, the key components generally include the following variables:
- Volume (VLM) simply tells you how many contracts of a particular option were traded during the latest session.
- The “bid” price is the latest price level at which a market participant wishes to buy a particular option.
- The “ask” price is the latest price offered by a market participant to sell a particular option.
- Implied Bid Volatility (IMPL BID VOL) can be thought of as the future uncertainty of price direction and speed. This value is calculated by an option-pricing model such as the Black-Scholes model and represents the level of expected future volatility based on the current price of the option.
- Open Interest (OPTN OP) number indicates the total number of contracts of a particular option that have been opened. Open interest decreases as open trades are closed.
- Delta can be thought of as a probability. For instance, a 30-delta option has roughly a 30% chance of expiring in-the-money.
- Gamma (GMM) is the speed the option is moving in or out-of-the-money. Gamma can also be thought of as the movement of the delta.
- Vega is a Greek value that indicates the amount by which the price of the option would be expected to change based on a one-point change in implied volatility.
- Theta is the Greek value that indicates how much value an option will lose with the passage of one day’s time.
- The “strike price” is the price at which the buyer of the option can buy or sell the underlying security if he/she chooses to exercise the option.
Buying at the bid and selling at the ask is how market makers make their living.
The simplest options position is a long call (or put) by itself. This position profits if the price of the underlying rises (falls), and your downside is limited to loss of the option premium spent. If you simultaneously buy a call and put option with the same strike and expiration, you’ve created a straddle.
This position pays off if the underlying price rises or falls dramatically; however, if the price remains relatively stable, you lose premium on both the call and the put. You would enter this strategy if you expect a large move in the stock but are not sure which direction.
Basically, you need the stock to have a move outside of a range. A similar strategy betting on an outsized move in the securities when you expect high volatility (uncertainty) is to buy a call and buy a put with different strikes and the same expiration—known as a strangle. A strangle requires larger price moves in either direction to profit but is also less expensive than a straddle. On the other hand, being short either a straddle or a strangle (selling both options) would profit from a market that doesn’t move much.
Below is an explanation of straddles from my Options for Beginners course:
And here’s a description of strangles:
How to use Straddle Strategies
Spreads & Combinations
Spreads use two or more options positions of the same class. They combine having a market opinion (speculation) with limiting losses (hedging). Spreads often limit potential upside as well. Yet these strategies can still be desirable since they usually cost less when compared to a single options leg. Vertical spreads involve selling one option to buy another. Generally, the second option is the same type and same expiration, but a different strike.
A bull call spread, or bull call vertical spread, is created by buying a call and simultaneously selling another call with a higher strike price and the same expiration. The spread is profitable if the underlying asset increases in price, but the upside is limited due to the short call strike. The benefit, however, is that selling the higher strike call reduces the cost of buying the lower one. Similarly, a bear put spread, or bear put vertical spread, involves buying a put and selling a second put with a lower strike and the same expiration. If you buy and sell options with different expirations, it is known as a calendar spread or time spread.
Combinations are trades constructed with both a call and a put. There is a special type of combination known as a “synthetic.” The point of a synthetic is to create an options position that behaves like an underlying asset, but without actually controlling the asset. Why not just buy the stock? Maybe some legal or regulatory reason restricts you from owning it. But you may be allowed to create a synthetic position using options.
A butterfly consists of options at three strikes, equally spaced apart, where all options are of the same type (either all calls or all puts) and have the same expiration. In a long butterfly, the middle strike option is sold and the outside strikes are bought in a ratio of 1:2:1 (buy one, sell two, buy one).
If this ratio does not hold, it is not a butterfly. The outside strikes are commonly referred to as the wings of the butterfly, and the inside strike as the body. The value of a butterfly can never fall below zero. Closely related to the butterfly is the condor – the difference is that the middle options are not at the same strike price.
Because options prices can be modeled mathematically with a model such as the Black-Scholes, many of the risks associated with options can also be modeled and understood. This particular feature of options actually makes them arguably less risky than other asset classes, or at least allows the risks associated with options to be understood and evaluated. Individual risks have been assigned Greek letter names, and are sometimes referred to simply as “the Greeks.”
Below is a very basic way to begin thinking about the concepts of Greeks:
Understanding Options Expiration (Profit and Loss)
Also available in
The profit and loss of an option position at expiration is a function of the original premium and the difference in price between the futures contract and the strike price of the option.
Selling a Call Scenario
Suppose you sell the 105 call for $2 in premium. The maximum profit potential for this trade is $2. Let’s look at a few different possible outcomes for the futures price at expiration.
To understand the profit and loss, we look at the math for each of these potential scenarios. You sold the option and collected $2 in premium. For each scenario the premium column will be $2 and the strike price is $105. This is the price at which you are obligated to sell the futures contract if you are assigned.
Sell Call Scenario One
In scenario one, the futures price at option expiry is $112. This option will be in the money and you would be assigned. You will sell the future for $105 creating an instantaneous $7 loss on the future. You collected $2 in premium and lost $7 on the future, so your net loss will be $5.
Sell Call Scenario Two
For scenario 2 we see the futures price at option expiry is $106. This option is also in the money and again you would be assigned. You will sell the future at the strike price of $105 and have a loss of $1 on the future. Since you collected $2 in premium you will have a net profit of $1.
Sell Call Scenario Three and Four
In scenario 3, the futures price at option expiry is $100. This option is out of the money and will not be exercised. There will be no loss from futures. Therefore, your $2 collected in premium will become your total profit.
Scenario 4 has the futures price at $94. This example is like scenario 3; the option will be out of the money and will not be exercised. Again, your final net position will be a profit of $2.
Buying a Call Scenario
Now let’s look at the same group of scenarios but from the buyer’s perspective.
In this case you buy a call at $105, and pay a $2 premium to the seller. We will look at your profit and loss potential using the same futures prices at option expiration.
Buy Call Scenario One
In scenario one, the futures price at option expiration will be $112. This option is in the money. You exercise the option at $105. With the futures at $112, this will result in a gain of $7. If you subtract the $2 premium paid for the option, your net profit will be $5.
Buy Call Scenario Two
For scenario two, the futures price at option expiration will be $106. Again, this option is still in the money. You exercise this option at $105 and make $1. You paid $2 in premium, so your net will be a loss of $1.
Buy Call Scenario Three and Four
Scenarios three and four are both out of the money options. In both cases you would not exercise the option. Your net loss has been capped at $2 which is the full premium paid for the option
These scenarios show you two views of profit and loss from either side of the same transaction. When looking at profit and loss potential of an option position at expiration, you will need to consider the original premium and the difference in price between the futures contract and the strike price of the option.
Basics Of Options Trading Explained
Before we delve deep into the world of options trading, let’s take a moment to understand why do we need options at all. If you are thinking it is just another way to make money and was created by some fancy guys in suits working in Wall Street, well, you are wrong. The options world predates the modern stock exchanges by a large margin.
While some credit the Samurai for giving us the foundation on which options contracts were based, some actually acknowledge the Greeks for giving us an idea on how to speculate on a commodity, in this case, the harvest of olives. In both cases, humans were trying to guess the price of a food item and trade accordingly (rice in the case of samurais), long before the modern world put in various rules and set up exchanges.
With this in mind, let us try to answer the first question in your mind.
What is options trading?
Let’s take a very simple example to understand options trading. Consider that you are buying a stock for Rs. 3000. But the broker tells you about an exciting offer, that you can buy it now for Rs. 3000 or you can give a token amount of Rs. 30 and reserve the right to buy it at Rs. 3000 after a month, even if the stock increases in value at that time. But that token amount is non-refundable!
You realise that there is a high chance that the stock would cross Rs. 3030 and thus, you can breakeven at least. Since you have to pay only Rs. 30 now, the remaining amount can be used elsewhere for a month. You wait for a month and then look at the stock price.
Now, depending on the stock price, you have the option to buy the stock from the broker or not. Of course, this is an over-simplification but this is options trading in a gist.In the world of trading, options are instruments that belong to the derivatives family, which means its price is derived from something else, mostly stocks. The price of an option is intrinsically linked to the price of the underlying stock.
A formal definition is given below:
A stock option is a contract between two parties in which the stock option buyer (holder) purchases the right (but not the obligation) to buy/sell shares of an underlying stock at a predetermined price from/to the option seller (writer) within a fixed period of time.
We are going to make sure that by the end of this article you are well versed with the options trading world along with trying out a few options trading strategies as well. We will cover the following points in this article. If you feel that you want to skip the basics of options, then head straight to the options trading strategies.
Let’s start now, shall we!
Options trading vs. Stock trading
There must be a doubt in your mind that why do we even have options trading if it is just another way of trading. Well, here are a few points which make it different from trading stocks
- The Options contract has an expiration date, unlike stocks. The expiration can vary from weeks, months to years depending upon the regulations and the type of Options that you are practising. Stocks, on the other hand, do not have an expiration date.
- Unlike Stocks, Options derive their value from something else and that’s why they fall under the derivatives category
- Options are not definite by numbers like Stocks
- Options owners have no right (voting or dividend) in a company unlike Stock owners
It is quite often that some people find the Option’s concept difficult to understand though they have already followed it in their other transactions, for e.g. car insurance or mortgages. In this part of the article, we will take you through some of the most important aspects of Options trading before we get down to the world of options trading.
The Strike Price is the price at which the underlying stocks can be bought or sold as per the contract. In options trading, the Strike Price for a Call Option indicates the price at which the Stock can be bought (on or before its expiration) and for Put Options trading it refers to the price at which the seller can exercise its right to sell the underlying stocks (on or before its expiration)
Since the Options themselves don’t have an underlying value, the Options premium is the price that you have to pay in order to purchase an Option. The premium is determined by multiple factors including the underlying stock price, volatility in the market and the days until the Option’s expiration. In options trading, choosing the premium is one of the most important components.
In options trading, the underlying asset can be stocks, futures, index, commodity or currency. The price of Options is derived from its underlying asset. For the purpose of this article, we will be considering the underlying asset as the stock. The Option of stock gives the right to buy or sell the stock at a specific price and date to the holder. Hence its all about the underlying asset or stocks when it comes to Stock in Options Trading.
In options trading, all stock options have an expiration date. The expiration date is also the last date on which the Options holder can exercise the right to buy or sell the Options that are in holding. In Options Trading, the expiration of Options can vary from weeks to months to years depending upon the market and the regulations.
There are two major types of Options that are practised in most of the options trading markets.
- American Options which can be exercised anytime before its expiration date
- European Options which can only be exercised on the day of its expiration
Moneyness (ITM, OTM & ATM)
It is very important to understand the Options Moneyness before you start trading in Stock Options. A lot of options trading strategies are played around the Moneyness of an Option.
It basically defines the relationship between the strike price of an Option and the current price of the underlying Stocks. We will examine each term in detail below.
When is an Option in-the-money?
- Call Option – when the underlying stock price is higher than the strike price
- Put Option – when the underlying stock price is lower than the strike price
When is an Option out-of-the-money?
- Call Option – when the underlying stock price is lower than the strike price
- Put Option – when the underlying stock price is higher than the strike price
When is an Option at-the-money?
- When the underlying stock price is equal to the strike price.
Take a break here to ponder over the different terms as we will find it extremely useful later when we go through the types of options as well as a few options trading strategies.
Type of options
In the true sense, there are only two types of Options i.e Call & Put Options. We will understand them in more detail.
To Call or Put
A Call Option is an option to buy an underlying Stock on or before its expiration date. At the time of buying a Call Option, you pay a certain amount of premium to the seller which grants you the right (but not the obligation) to buy the underlying stock at a specified price (strike price).
Purchasing a call option means that you are bullish about the market and hoping that the price of the underlying stock may go up. In order for you to make a profit, the price of the stock should go higher than the strike price plus the premium of the call option that you have purchased before or at the time of its expiration.
In contrast, a Put Option is an option to sell an underlying Stock on or before its expiration date. Purchasing a Put Option means that you are bearish about the market and hoping that the price of the underlying stock may go down. In order for you to make a profit, the price of the stock should go down from the strike price plus the premium of the Put Option that you have purchased before or at the time of its expiration.
In this manner, both Put and Call option buyer’s loss is limited to the premium paid but profit is unlimited. The above explanations were from the buyer’s point of view. We will now understand the put-call options from the seller’s point of view, ie options writers. The Put option seller, in return for the premium charged, is obligated to buy the underlying asset at the strike price.
Similarly, the Call option seller, in return for the premium charged, is obligated to sell the underlying asset at the strike price. Is there a way to visualise the potential profit/loss of an option buyer or seller? Actually, there is. An option payoff diagram is a graphical representation of the net Profit/Loss made by the option buyers and sellers.
Before we go through the diagrams, let’s understand what the four terms mean. As we know that going short means selling and going long means buying the asset, the same principle applies to options. Keeping this in mind, we will go through the four terms.
- Short call – Here we are betting that the prices will fall and hence, a short call means you are selling calls.
- Short put – Here the short put means we are selling a put option
- Long call – it means that we are buying a call option since we are optimistic about the underlying asset’s share price
- Long put – Here we are buying a put option.
S = Underlying Price
X = Strike Price
Break-even point is that point at which you make no profit or no loss.
The long call holder makes a profit equal to the stock price at expiration minus strike price minus premium if the option is in the money. Call option holder makes a loss equal to the amount of premium if the option expires out of money and the writer of the option makes a flat profit equal to the option premium.
Similarly, for the put option buyer, profit is made when the option is in the money and is equal to the strike price minus the stock price at expiration minus premium. And, the put writer makes a profit equal to the premium for the option.
All right, until now we have been going through a lot of theory. Let’s switch gears for a minute and come to the real world. How do options look like? Well, let’s find out.
What does an options trading quote consist of?
If you were to look for an options quote on Apple stock, it would look something like this:
When this was recorded, the stock price of Apple Inc. was $196. Now let’s take one line from the list and break it down further.
In a typical options chain, you will have a list of call and put options with different strike prices and corresponding premiums. The call option details are on the left and the put option details are on the right with the strike price in the middle.
- The symbol and option number is the first column.
- The “last” column signifies the amount at which the last time the option was bought.
- “Change” indicates the variance between the last two trades of the said options
- “Bid” column indicates the bid submitted for the option.
- “Ask” indicates the asking price sought by the option seller.
- “Volume” indicates the number of options traded. Here the volume is 0.
- “Open Interest” indicates the number of options which can be bought for that strike price.
The columns are the same for the put options as well. In some cases, the data provider signifies whether the option is in the money, at the money or out of money as well. Of course, we need an example to really help our understanding of options trading. Thus, let’s go through one now.
Options Trading Example
We will go through two cases to better understand the call and put options.
For simplicity’s sake, let us assume the following:
- Price of Stock when the option is written: $100
- Premium: $5
- Expiration date: 1 month after the option is bought
The current price of stock: $110. Strike price: $120
The current price of stock: $120. Strike price: $110
Considering that we have gone through the detailed scenario of each option, how about we combine a few options together. Let’s understand an important concept which many professionals use in options trading.
What is Put-Call Parity In Python?
Put-call parity is a concept that anyone who is interested in options trading needs to understand. By gaining an understanding of put-call parity you can understand how the value of call option, put option and the stock are related to each other. This enables you to create other synthetic position using various option and stock combination.
The principle of put-call parity
Put-call parity principle defines the relationship between the price of a European Put option and European Call option, both having the same underlying asset, strike price and expiration date. If there is a deviation from put-call parity, then it would result in an arbitrage opportunity. Traders would take advantage of this opportunity to make riskless profits till the time the put-call parity is established again.
The put-call parity principle can be used to validate an option pricing model. If the option prices as computed by the model violate the put-call parity rule, such a model can be considered to be incorrect.
Understanding Put-Call Parity
To understand put-call parity, consider a portfolio “A” comprising of a call option and cash. The amount of cash held equals the call strike price. Consider another portfolio “B” comprising of a put option and the underlying asset.
S0 is the initial price of the underlying asset and ST is its price at expiration.
Let “r” be the risk-free rate and “T” be the time for expiration.
In time “T” the Zero-coupon bond will be worth K (strike price) given the risk-free rate of “r”.
Portfolio A = Call option + Zero-coupon bond
Portfolio B = Put option + Underlying Asset
If the share price is higher than X the call option will be exercised. Else, cash will be retained. Hence, at “T” portfolio A’s worth will be given by max(ST, X).
If the share price is lower than X, the put option will be exercised. Else, the underlying asset will be retained. Hence, at “T”, portfolio B’s worth will be given by max (ST, X).
If the two portfolios are equal at time, “T”, then they should be equal at any time. This gives us the put-call parity equation.
Equation for put-call parity:
C + Xe-rT = P + S0
In this equation,
- C is the premium on European Call Option
- P is the premium of European Put Option
- S0 is the spot price of the underlying stock
- And, Xe-rT is the current value (discounted value) of Zero-coupon bond (X)
We can summarize the payoffs of both the portfolios under different conditions as shown in the table below.
From the above table, we can see that under both scenarios, the payoffs from both the portfolios are equal.
Required Conditions For Put-call Parity
For put-call parity to hold, the following conditions should be met. However, in the real world, they hardly hold true and put-call parity equation may need some modifications accordingly. For the purpose of this blog, we have assumed that these conditions are met.
- The underlying stock doesn’t pay any dividend during the life of the European options
- There are no transaction costs
- There are no taxes
- Shorting is allowed and there are no borrow charges
Hence, put-call parity will hold in a frictionless market with the underlying stock paying no dividends.
In options trading, when the put-call parity principle gets violated, traders will try to take advantage of the arbitrage opportunity. An arbitrage trader will go long on the undervalued portfolio and short the overvalued portfolio to make a risk-free profit.
How to take advantage of arbitrage opportunity
Let us now consider an example with some numbers to see how trade can take advantage of arbitrage opportunities. Let’s assume that the spot price of a stock is $31, the risk-free interest rate is 10% per annum, the premium on three-month European call and put are $3 and $2.25 respectively and the exercise price is $30.
In this case, the value of portfolio A will be,
C+Xe-rT = 3+30e-0.1 * 3/12 = $32.26
The value of portfolio B will be,
P + S0 = 2.25 + 31 = $33.25
Portfolio B is overvalued and hence an arbitrageur can earn by going long on portfolio A and short on portfolio B. The following steps can be followed to earn arbitrage profits.
- Short the stock. This will generate a cash inflow of $31.
- Short the put option. This will generate a cash inflow of $2.25.
- Purchase the call option. This will generate cash outflow of $3.
- Total cash inflow is -3 + 2.25 + 31 = $30.25.
- Invest $30.25 in a zero-coupon bond with 3 months maturity with a yield of 10% per annum.
Return from the zero coupon bond after three months will be 30.25e 0.1 * 3/12 = $31.02.
If the stock price at maturity is above $30, the call option will be exercised and if the stock price is less than $30, the put option will be exercised. In both the scenarios, the arbitrageur will buy one stock at $30. This stock will be used to cover the short.
Total profit from the arbitrage = $31.02 – $30 = $1.02
Well, shouldn’t we look at some codes now?
Python Codes Used For Plotting The Charts
The below code can be used to plot the payoffs of the portfolios.
So far, we have gone through the basic concepts in options trading and looked at an options trading strategy as well. At this juncture, let’s look at the world of options trading and try to answer a simple question.
Why is Options Trading attractive?
Options are attractive instruments to trade in because of the higher returns. An option gives the right to the holder to do something, with the ‘option’ of not to exercise that right. This way, the holder can restrict his losses and multiply his returns.
While it is true that one options contract is for 100 shares, it is thus less risky to pay the premium and not risk the total amount which would have to be used if we had bought the shares instead. Thus your risk exposure is significantly reduced.However, in reality, options trading is very complex and that is because options pricing models are quite mathematical and complex.
So, how can you evaluate if the option is really worth buying? Let’s find out.
The key requirement in successful options trading strategies involves understanding and implementing options pricing models. In this section, we will get a brief understanding of Greeks in options which will help in creating and understanding the pricing models.
Options Pricing is based on two types of values
Intrinsic Value of an option
Recall the moneyness concept that we had gone through a few sections ago. When the call option stock price is above the strike price or when put option stock price is below the strike price, the option is said to be “In-The-Money (ITM)”, i.e. it has an intrinsic value. On the other hand, “Out of the money (OTM)” options have no intrinsic value. For OTM call options, the stock price is below the strike price and for OTM put options; stock price is above the strike price. The price of these options consists entirely of time value.
Time Value of an option
If you subtract the amount of intrinsic value from an options price, you’re left with the time value. It is based on the time to expiration. You can enroll for this free online options trading python course on Quantra and understand basic terminologies and concepts that will help you in options trading. We know what is intrinsic and the time value of an option. We even looked at the moneyness of an option. But how do we know that one option is better than the other, and how to measure the changes in option pricing. Well, let’s take the help of the greeks then.
Greeks are the risk measures associated with various positions in options trading. The common ones are delta, gamma, theta and vega. With the change in prices or volatility of the underlying stock, you need to know how your options pricing would be affected. Greeks in options help us understand how the various factors such as prices, time to expiry, volatility affect the options pricing.
Delta measures the sensitivity of an option’s price to a change in the price of the underlying stock. Simply put, delta is that options greek which tells you how much money a stock option will rise or drop in value with a $1 rise or drop in the underlying stock. Delta is dependent on underlying price, time to expiry and volatility. While the formula for calculating delta is on the basis of the Black-Scholes option pricing model, we can write it simply as,
Delta = [Expected change in Premium] / [Change in the price of the underlying stock]
Let’s understand this with an example for a call option:
We will create a table of historical prices to use as sample data. Let’s assume that the option will expire on 5th March and the strike price agreed upon is $140.
Thus, if we had to calculate the delta for the option on 2nd March, it would be $5/$10 = 0.5.
Here, we should add that since an option derives its value from the underlying stock, the delta option value will be between 0 and 1. Usually, the delta options creeps towards 1 as the option moves towards “in-the-money”.
While the delta for a call option increases as the price increases, it is the inverse for a put option. Think about it, as the stock price approaches the strike price, the value of the option would decrease. Thus, the delta put option is always ranging between -0 and 1.
Gamma measures the exposure of the options delta to the movement of the underlying stock price. Just like delta is the rate of change of options price with respect to underlying stock’s price; gamma is the rate of change of delta with respect to underlying stock’s price. Hence, gamma is called the second-order derivative.
Gamma = [Change in an options delta] / [Unit change in price of underlying asset]
Let’s see an example of how delta changes with respect to Gamma. Consider a call option of stock at a strike price of $300 for a premium of $15.
- Strike price: $300
- Initial Stock price: $150
- Delta: 0.2
- Gamma: 0.005
- Premium: $15
- New stock price: $180
- Change in stock price: $180 – $150 = $30
Thus, Change in Premium = Delta * Change in price of stock = 0.2 * 30 = 6.
Thus, new premium = $15 + $6 = $21
Change in delta = Gamma * Change in stock price = 0.005 * 30 = 0.15
Thus, new delta = 0.2 + 0.15 = 0.35.
Let us take things a step further and assume the stock price increases another 30 points, to $210.
New stock price: $210
Change in stock price: $210 – $180 = $30
Change in premium = Delta *Change in 0.35*30 = $10.5
Thus, new premium = $21 + $10.5 = $31.5
Change in delta = Gamma * Change in stock price = 0.005 * 30 = 0.15
Thus, new delta = 0.35 + 0.15 = 0.5.
In this way, delta and gamma of an option changes with the change in the stock price. We should note that Gamma is the highest for a stock call option when the delta of an option is at the money. Since a slight change in the underlying stock leads to a dramatic increase in the delta. Similarly, the gamma is low for options which are either out of the money or in the money as the delta of stock changes marginally with changes in the stock option.
Highest Gamma for At-the-money (ATM) option
Among the three instruments, at-the-money (ATM), out-of-the-money (OTM) and in-the-money (ITM); at the money (ATM) has the highest gamma. You can watch this video to understand it in more detail.
Theta measures the exposure of the options price to the passage of time. It measures the rate at which options price, especially in terms of the time value, changes or decreases as the time to expiry is approached.
Vega measures the exposure of the option price to changes in the volatility of the underlying. Generally, options are more expensive for higher volatility. So, if the volatility goes up, the price of the option might go up to and vice-versa.
Vega increases or decreases with respect to the time to expiry?
What do you think? You can confirm your answer by watching this video.
One of the popular options pricing model is Black Scholes, which helps us to understand the options greeks of an option.
Black-Scholes options pricing model
The formula for the Black-Scholes options pricing model is given as:
C is the price of the call option
P represents the price of a put option.
S0 is the underlying price,
X is the strike price,
σ represents volatility,
r is the continuously compounded risk-free interest rate,
t is the time to expiration, and
q is the continuously compounded dividend yield.
N(x) is the standard normal cumulative distribution function.
The formulas for d1 and d2 are given as:
To calculate the Greeks in options we use the Black-Scholes options pricing model.
Delta and Gamma are calculated as:
In the example below, we have used the determinants of the BS model to compute the Greeks in options.
At an underlying price of 1615.45, the price of a call option is 21.6332.
If we were to increase the price of the underlying by Rs. 1, the change in the price of the call, put and values of the Greeks in the option is as given below.
As can be observed, the Delta of the call option in the first table was 0.5579. Hence, given the definition of the delta, we can expect the price of the call option to increase approximately by this value when the price of the underlying increases by Rs.1. The new price of the call option is 22.1954 which is
Let’s move to Gamma, another Greek in option.
If you observe the value of Gamma in both the tables, it is the same for both call and put options contracts since it has the same formula for both options types. If you are going long on the options, then you would prefer having a higher gamma and if you are short, then you would be looking for a low gamma. Thus, if an options trader is having a net-long options position then he will aim to maximize the gamma, whereas in case of a net-short position he will try to minimize the gamma value.
The third Greek, Theta has different formulas for both call and put options. These are given below:
In the first table on the LHS, there are 30 days remaining for the options contract to expire. We have a negative theta value of -0.4975 for a long call option position which means that the options trader is running against time.
He has to be sure about his analysis in order to profit from trade as time decay will affect this position. This impact of time decay is evident in the table on the RHS where the time left to expiry is now 21 days with other factors remaining the same. As a result, the value of the call option has fallen from 21.6332 to 16.9 behaviour 319. If an options trader wants to profit from the time decay property, he can sell options instead of going long which will result in a positive theta.
We have just discussed how some of the individual Greeks in options impact option pricing. However, it is very essential to understand the combined behaviour of Greeks in an options position to truly profit from your options position. If you want to work on options greeks in Excel, you can refer to this blog.
Let us now look at a Python package which is used to implement the Black Scholes Model.
Python Library – Mibian
What is Mibian?
Mibian is an options pricing Python library implementing the Black-Scholes along with a couple other models for European options on currencies and stocks. In the context of this article, we are going to look at the Black-Scholes part of this library. Mibian is compatible with python 2.7 and 3.x. This library requires scipy to work properly.
How to use Mibian for BS Model?
The function which builds the Black-Scholes model in this library is the BS() function. The syntax for this function is as follows:
The first input is a list containing the underlying price, strike price, interest rate and days to expiration. This list has to be specified each time the function is being called. Next, we input the volatility, if we are interested in computing the price of options and the option greeks. The BS function will only contain two arguments.
If we are interested in computing the implied volatility, we will not input the volatility but instead will input either the call price or the put price. In case we are interested in computing the put-call parity, we will enter both the put price and call price after the list. The value returned would be:
(call price + price of the bond worth the strike price at maturity) – (put price + underlying asset price)
The syntax for returning the various desired outputs are mentioned below along with the usage of the BS function. The syntax for BS function with the input as volatility along with the list storing underlying price, strike price, interest rate and days to expiration:
Attributes of the returned value from the above-mentioned BS function:
The syntax for BS function with the input as callPrice along with the list storing underlying price, strike price, interest rate and days to expiration:
Attributes of the returned value from the above-mentioned BS function:
The syntax for BS function with the input as putPrice along with the list storing underlying price, strike price, interest rate and days to expiration:
Attributes of the returned value from the above-mentioned BS function:
The syntax for BS function with the inputs as callPrice and putPrice along with the list storing underlying price, strike price, interest rate and days to expiration:
Attributes of the returned value from the above-mentioned BS function:
While Black-Scholes is a relatively robust model, one of its shortcomings is its inability to predict the volatility smile. We will learn more about this as we move to the next pricing model.
Derman Kani Model
The Derman Kani model was developed to overcome the long-standing issue with the Black Scholes model, which is the volatility smile. One of the underlying assumptions of Black Scholes model is that the underlying follows a random walk with constant volatility. However, on calculating the implied volatility for different strikes, it is seen that the volatility curve is not a constant straight line as we would expect, but instead has the shape of a smile. This curve of implied volatility against the strike price is known as the volatility smile.
If the Black Scholes model is correct, it would mean that the underlying follows a lognormal distribution and the implied volatility curve would have been flat, but a volatility smile indicates that traders are implicitly attributing a unique non-lognormal distribution to the underlying. This non-lognormal distribution can be attributed to the underlying following a modified random walk, in the sense that the volatility is not constant and changes with both stock price and time. In order to correctly value the options, we would need to know the exact form of the modified random walk.
The Derman Kani model shows how to take the implied volatilities as inputs to deduce the form of the underlying’s random walk. More specifically a unique binomial tree is extracted from the smile corresponding to the random walk of the underlying, this tree is called the implied tree. This tree can be used to value other derivatives whose prices are not readily available from the market – for example, it can be used in standard but illiquid European options, American options, and exotic options.
What is the Heston Model?
Steven Heston provided a closed-form solution for the price of a European call option on an asset with stochastic volatility. This model was also developed to take into consideration the volatility smile, which could not be explained using the Black Scholes model.
The basic assumption of the Heston model is that volatility is a random variable. Therefore there are two random variables, one for the underlying and one for the volatility. Generally, when the variance of the underlying has been made stochastic, closed-form solutions will no longer exist.
But this is a major advantage of the Heston model, that closed-form solutions do exist for European plain vanilla options. This feature also makes calibration of the model feasible. If you are interested in learning about these models in more detail, you may go through the following research papers,
- Derman Kani Model – “The Volatility Smile and Its Implied Tree” by Emanuel Derman and Iraj Kani.
- Heston Model – “A Closed-Form Solution for Options with Stochastic Volatility with Applications to Bond and Currency Options”
So far, you have understood options trading and how to analyse an option as well as the pricing models used. Now, to apply this knowledge, you will need access to the markets, and this is where the role of a broker comes in.
Opening an options trading account
How to choose a broker for Options Trading?
Before we open an options trading account with a broker, let’s go over a few points to take into consideration when we choose a broker.
- Understand your aim when you tread the options trading waters, whether it is a way of hedging risk, as a speculative instrument, for income generation etc.
- Does the broker provide option evaluation tools of their own? It is always beneficial to have access to a plethora of tools when you are selecting the right option.
- Enquire the transaction costs or the commission charged by the broker as this will eat into your investment gains.
- Some brokers give access to research materials in various areas of the stock market. You can always check with the broker about access to research as well as subscriptions etc.
- Check the payment options provided by the broker to make sure it is compatible with your convenience.
Searching for the right broker
Once the required background research is done, you can choose the right broker as per your need and convenience. In the global market, a list of the top brokers is provided below:
List of Top International Brokers (Options Trading)
The list of top international options brokers is given below:
- E-trade ($0.65 per options contract)
- Ally Invest ($0.5 per contract traded)
- TD Ameritrade ($0.65 fee per contract)
- Interactive Brokers (starts at $0.25 per options contract)
- Schwab Brokerage ($0.65 per options contract)
List of Top Indian Brokers (Options Trading)
The list of top Indian options brokers is given below:
- ICICI Direct
- HDFC Securites
- Kotak Securities
- Angel Broking
- Axis Direct
Great! Now we look at some options trading strategies which can be used in the real world.
Options Trading Strategies
There are quite a few options trading strategies which can be used in today’s trading landscape. One of the most popular options trading strategies is based on Spreads and Butterflies. Let’s look at them in detail.
Spreads and Butterflies
Spreads or rather spread trading is simultaneously buying and selling the same option class but with different expiration date and strike price. Spread options trading is used to limit the risk but on the other hand, it also limits the reward for the person who indulges in spread trading.
Thus, if we are only interested in buying and selling call options of security, we will call it a call spread, and if it is only puts, then it will be called a put spread.
Depending on the changing factor, spreads can be categorised as:
- Horizontal Spread – Different expiration date, Same Strike price
- Vertical Spread – Same Expiration date, Different Strike price
- Diagonal Spread – Different expiration date, Different Strike price
Remember that an option’s value is based on the underlying security (in this case, stock price). Thus, we can also distinguish an option spread on whether we want the price to go up (Bull spread) or go down (Bear spread).
Bull call spread
In a bull call spread, we buy more than one option to offset the potential loss if the trade does not go our way.
Let’s try to understand this with the help of an example.
The following is a table of the available options for the same underlying stock and same expiry date:
Normally, if we have done the analysis and think that the stock can rise to $200, one way would be to buy a call stock option with a strike price of $180 for a premium of $15. Thus, if we are right and the stock reaches $200 on expiry, we buy it at the strike price of $180 and pocket a profit of ($20 -$15) = $5 since we paid the premium of $15.
But if we were not right and the stock price reaches $180 or less, we will not exercise the option resulting in a loss of the premium of $15. One workaround is to buy a call option at $180 and sell a call option for $200 at $10.
Thus, when the stock’s price reaches $200 on expiry, we exercise the call option for a profit of $5 (as seen above) and also pocket a profit of the premium of $10 since it will not be exercised by the owner. Thus, in this way, the total profit is ($5 + $10) = $15.
If the stock price goes above $200 and the put option is exercised by the owner, the increase in the profit from bought call option at $180 will be the same as the loss accumulated from the sold call option at $200 and thus, the profit would always be $15 no matter the increase in the stock price above $200 at expiry date.
Let’s construct a table to understand the various scenarios.
You can go through this informative blog to understand how to implement it in Python.
Bear put spread
The bull call spread was executed when we thought the stock would be increasing, but what if we analyse and find the stock price would decrease. In that case, we use the bear put spread.
Let’s assume that we are looking at the different strike prices of the same stock with the same expiry date.
One way to go about it is to buy the put option for the strike price of 160 at a premium of $15 while selling a put option for the strike price of $140 for the strike price of $10.
Thus, we create a scenario table as follows:
In this way, we can minimize our losses by simultaneously buying and selling options. You can go through this informative blog to understand how to implement it in Python.
A butterfly spread is actually a combination of bull and bear spreads. One example of the Butterfly Options Strategy consists of a Body (the middle double option position) and Wings (2 opposite end positions).
- Its properties are listed as follows:
- It is a three-leg strategy
- Involves buying or selling of Call/Put options (unlike Covered Call Strategy where a stock is bought and an OTM call option is sold)
- Can be constructed using Calls or Puts
- 4 options contracts at the same expiry date
- Have the same underlying asset
- 3 different Strike Prices are involved (2 have the same strike price)
- Create 2 Trades with these calls
Other Trading Strategies
We will list down a few more options trading strategies below:
We have covered all the basics of options trading which include the different Option terminologies as well as types. We also went through an options trading example and the option greeks. We understood various options trading strategies and things to consider before opening an options trading account.
If you have always been interested in automated trading and don’t know where to start, we have created a learning track for you at Quantra, which includes the. “Trading using Option Sentiment Indicators” course.
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