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In investment terms, arbitrage describes a scenario where it's possible to simultaneously make multiple trades on one asset for a profit with no risk involved due to price inequalities. A very simple example would be if an asset was trading in a market at a certain price and also trading in another market at a higher price at the same point in time. If you bought the asset at the lower price, you could then immediately sell it at the higher price to make a profit without having taken any risk.
In reality, arbitrage opportunities are somewhat more complicated than this, but the example serves to highlight the basic principle. In options trading, these opportunities can appear when options are mispriced or put call parity isn't correctly preserved.
While the idea of arbitrage sounds great, unfortunately such opportunities are very few and far between. When they do occur, the large financial institutions with powerful computers and sophisticated software tend to spot them long before any other trader has a chance to make a profit.
Therefore, we wouldn't advise you to spend too much time worrying about it, because you are unlikely to ever make serious profits from it. If you do want to know more about the subject, below you will find further details on put call parity and how it can lead to arbitrage opportunities.
We have also included some details on trading strategies that can be used to profit from arbitrage should you ever find a suitable opportunity.
In order for arbitrage to actually work, there basically has to be some disparity in the price of a security, such as in the simple example mentioned above of a security being underpriced in a market. In options trading, the term underpriced can be applied to options in a number of scenarios. For example, a call may be underpriced in relation to a put based on the same underlying security, or it could be underpriced when compared to another call with a different strike or a different expiration date.
In theory, such underpricing should not occur, due to a concept known as put call parity. The concept of put call parity is basically that options based on the same underlying security should have a static price relationship, taking into account the price of the underlying security, the strike of the contracts, and the expiration date of the contracts. When put call parity is correctly in place, then arbitrage would not be possible.
It's largely the responsibility of market makers,who influence the price of options contracts in the exchanges, to ensure that this parity is maintained. When it's violated, this is when opportunities for arbitrage potentially exist. In such circumstances, there are certain strategies that traders can use to generate risk free returns.
We have provided details on some of these below. Strike arbitrage is a strategy used to make a guaranteed profit when there's a price discrepancy between two options contracts that are based on the same underlying security and have the same expiration date, but have different strikes.
The basic scenario where this strategy could be used is when the difference between the strikes of two options is less than the difference between their extrinsic values. So as you can see, the strategy would return a profit regardless of what happened to the price of the underlying security.
Strike arbitrage can occur in a variety of different ways, essentially any time that there's a price discrepancy between options of the same type that have different strikes. The actual strategy used can vary too, because it depends on exactly how the discrepancy manifests itself. If you do find a discrepancy, it should be obvious what you need to do to take advantage of it. Remember, though, that such opportunities are incredibly rare and will probably only offer very small margins for profit so it's unlikely to be worth spending too much time look for them.
To understand conversion and reversal arbitrage, you should have a decent understanding of synthetic positions and synthetic options trading strategies, because these are a key aspect. The basic principle of synthetic positions in options trading is that you can use a combination of options and stocks to precisely recreate the characteristics of another position.
Conversion and reversal arbitrage are strategies that use synthetic positions to take advantage of inconsistencies in put call parity to make profits without taking any risk.
As stated, synthetic positions emulate other positions in terms of the cost to create them and their payoff characteristics. It's possible that, if the put call parity isn't as it should be, that price discrepancies between a position and the corresponding synthetic position may exist.
When this is the case, it's theoretically possible to buy the cheaper position and sell the more expensive one for a guaranteed and risk free return.
For example a synthetic long call is created by buying stock and buying put options based on that stock. If there was a situation where it was possible to create a synthetic long call cheaper than buying the call options, then you could buy the synthetic long call and sell the actual call options. The same is true for any synthetic position.
When buying stock is involved in any part of the strategy, it's known as a conversion. When short selling stock is involved in any part of the strategy, it's known as a reversal.
If you do have a good understanding of synthetic positions, though, and happen to discover a situation where there is a discrepancy between the price of creating a position and the price of creating its corresponding synthetic position, then conversion and reversal arbitrage strategies do have their obvious advantages.
This box spread is a more complicated strategy that involves four separate transactions. Once again, situations where you will be able to exercise a box spread profitably will be very few and far between. The box spread is also commonly referred to as the alligator spread, because even if the opportunity to use one does arise, the chances are that the commissions involved in making the necessary transactions will eat up any of the theoretical profits that can be made.
For these reasons, we would advise that looking for opportunities to use the box spread isn't something you should spend much time on. They tend to be the reserve of professional traders working for large organizations, and they require a reasonably significant violation of put call parity.
A box spread is essentially a combination of a conversion strategy and a reversal strategy but without the need for the long stock positions and the short stock positions as these obviously cancel each other out. Therefore, a box spread is in fact basically a combination of a bull call spread and a bear put spread.
The biggest difficulty in using a box spread is that you have to first find the opportunity to use it and then calculate which strikes you need to use to actually create an arbitrage situation. What you are looking for is a scenario where the minimum pay out of the box spread at the time of expiration is greater than the cost of creating it. It's also worth noting that you can create a short box spread which is effectively a combination of a bull put spread and a bear call spread where you are looking for the reverse to be true: The calculations required to determine whether or not a suitable scenario to use the box spread exists are fairly complex, and in reality spotting such a scenario requires sophisticated software that your average trader is unlikely to have access to.
The chances of an individual options trader identifying a prospective opportunity to use the box spread are really quite low. As we have stressed throughout this article, we are of the opinion that looking for arbitrage opportunities isn't something that we would generally advise spending time on.
Such opportunities are just too infrequent and the profit margins invariably too small to warrant any serious effort. Even when opportunities do arise, they are usually snapped by those financial institutions that are in a much better position to take advantage of them.
However, while the attraction of making risk free profits is obvious, we believe that your time is better spent identifying other ways to make profits using the more standard options trading strategies. Options Arbitrage Strategies In investment terms, arbitrage describes a scenario where it's possible to simultaneously make multiple trades on one asset for a profit with no risk involved due to price inequalities.
Section Contents Quick Links. Strike Arbitrage Strike arbitrage is a strategy used to make a guaranteed profit when there's a price discrepancy between two options contracts that are based on the same underlying security and have the same expiration date, but have different strikes. Box Spread This box spread is a more complicated strategy that involves four separate transactions.
Summary As we have stressed throughout this article, we are of the opinion that looking for arbitrage opportunities isn't something that we would generally advise spending time on.
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