Showing posts with label theta. Show all posts
Showing posts with label theta. Show all posts

Monday, March 26, 2012

Q&A: VXX Declines, Yet April 20 Calls Rise

A reader asked earlier today:

Can you explain to a newbie why VXX is down 1.05 today yet the April 20 calls are up .05?

This is a great question and one which I receive in one form or another on a regular basis.

While there are a number of variables that go into the price of an option, in the short-term the factors which have the biggest influence on the changes in the price of an option are typically:
1)  the change in the price of the underlying
2)  the change in the option’s implied volatility

Since we know from the question that VXX is down today (and down even more from the time the question was asked) this almost certainly makes implied volatility the culprit.

Rather than speculate, I pulled up the graphic below from LivevolPro which confirms that in the case of the VXX April 20 calls, implied volatility (IV), which is shown as a solid red line (VXX April 20 call on the left, April 20 put on the right), jumped from 84 on Friday to over 106 today.  For some historical perspective, the IV had been stuck in the 70s for more than a month prior to Friday, at which point it increased from 75 to 84.

This should serve as a reminder for those who are relatively new to options and are attracted to the possibility of making large amounts of money on directional trades that guessing the direction of the price move is not sufficient for making a profitable directional trade.  In addition to getting the direction right, an options trader has to be cognizant of changes in implied volatility as well as the impact of time decay, aka theta.

For those not familiar with the specifics of options pricing models, the Black-Scholes entry at Wikipedia is a good place to start.

Related posts:

[source(s): LivevolPro.com]

Disclosure(s): short VXX at time of writing; Livevol is an advertiser on VIX and More

Friday, December 9, 2011

Taking Profits in VIX Options (and ETPs)

Two hours into today’s session, the trading idea I mentioned yesterday, going long VIX puts, is doing quite well. The VIX Dec 27.50s are up more than 50% and the Dec 30s puts have advanced about 45%.

One question that I believe is much trickier with VIX options than options for most other securities is when and how to take profits. A large reason why taking profits in VIX options has an extra layer of complexity and difficulty is due to the mean reversion tendencies of volatility in general and the VIX in particular.

Another potential complicating factor regarding the management of VIX options positions has to do with their underlying. I hope that by now readers of this blog have had it drummed into their head that the VIX futures are the best proxy for the underlying in VIX options, not the cash VIX or VIX index, which is the VIX that is most often quoted in the media. Anyone holding positions in VIX options – and VIX ETPs for that matter – should be monitoring the VIX futures.

Looking at the changes in the first two hours of trading, one can see the typical pattern in which the front month (December) VIX futures (-6.3%) are moving about 80% as much as the cash VIX (-7.9%), with the second month (January) futures (-4.4%) moving about 56% of the cash VIX. This is right in line with historical norms. For an additional data point, VXX, which is a blend of front month and second month VIX futures, is down about 4.7%, which makes sense in that hold a disproportionate amount of front month futures at this point in the options expiration cycle.

So what does this all mean for taking profits in VIX options?

First, I cannot overstate how important it is to watch the VIX futures and understand how they move in relation to the cash VIX.

Second, because the VIX has a tendency to mean revert and thus often reverse recent sharp moves in either direction, it is important to take at least partial profits when one is the beneficiary of a significant favorable move in volatility. I like to take profits in 25% or 50% of my position, for instance, if my VIX options appreciate by 50%.

Third, keep in mind that the long VIX puts mentioned above are still out of the money and have no intrinsic value. As a result, they are subject to significant time decay (theta) each day and therefore will lose value if there are no additional favorable moves in volatility.

The bottom line is that harvesting VIX profits can be a challenging task and should be thought of as part art and part science. One only has to look at the many steeple-shaped VIX spikes to appreciate just how fleeting large profit opportunities in VIX options can be.

Besides, who knows what the next rumor out of Europe will be and how much the masses will panic or unpanic.

Related posts:

 

[source: LivevolPro.com]

Disclosure(s): short VXX at time of writing; Livevol is an advertiser on VIX and More

Tuesday, August 10, 2010

What a Difference a Weekly Makes

Last week I made my first trade using weekly options. Part of the reason I am so excited about weeklys is that I would not have made the trade had only standard monthly options been available.

Last Monday, after the markets had jumped more than 2%, I was of the opinion that we would have choppy trading on Tuesday through Thursday, as investors chose to sit on the sidelines in advance of Friday’s nonfarm payrolls report.

My trade of choice was a short straddle and my preferred underlying was IWM, the iShares Russell 2000 Index ETF. When I looked at the available options, the weeklys almost jumped off of the page, with superb liquidity and much higher implied volatility. As the intent of my trade was to take maximum advantage of time decay (theta), choosing the weeklys were a no-brainer.

A look at the chart below shows the difference in IV between the IWM weekly options that expire this Friday (red line) and the standard monthly options that expire the following week (yellow line.) All things being equal (and they never are) the higher implied volatility of the shorter-dated weeklys translates into substantially higher time decay.

So…if you are comfortable trading options that are toward the end of the expiration cycle, take a close look at the weeklys. If you are not comfortable doing this (controlling gamma risk is critical), then perhaps future posts on weekly options will assist in this regard.

For more on related subjects, readers are encouraged to check out:


[source: Livevol Pro]

Disclosure(s): long IWM at time of writing; Livevol is an advertiser on VIX and More

Thursday, September 10, 2009

Position Management for SPX Short Straddle

I suspect that when most investors make the jump from stocks to options, the most difficult issue for them to come to terms with is position management. With stocks, it is easy for an investor to reason that if a particular stock rises to a target price of X, he or she will take the profits and exit the position. By the same token, if the stock falls below Y, this means it is time to cut losses.

For options, the process becomes much more complicated. One of the complicating factors is certainly the potential for extreme percentage changes in an option position. It is not uncommon for an option to double in value for several consecutive days; alternatively an option can lose half of its value several days in a row.

Given all the questions I have received about how to manage options positions, going forward I have decided to share some of my thinking about position management using real-time case studies of options trades.

Let me offer up a taste of what I had in mind using a recent short straddle trade on the SPX that I first talked about on August 20th in The Sideways Play.

First, while I did not go into detail about the rationale for the trade at the time of the original post, one of the technical factors I found appealing was the possibility of the 1000 serving as a consolidation point, with SPX potentially trading in a narrow range that was defined by 978-1018 at the time. The chart below shows that following the initial post (black arrow), SPX subsequently rallied as high as 1040, closing a little over 1030 on August 27th. When SPX subsequently fell back below 1000 last week, there was reason to believe that the 1030 (closing) and 1040 (intraday) levels might serve as resistance. As described in SPX Short Straddle Still Hugging 1000 Level, the trade had started to yield some meaningful profits at this stage.


[graphic: StockCharts]

Recall from the original post that the short straddle will be profitable if the SPX option settles (on September 19th) anywhere in the 950-1050 range. At the moment, with SPX in the upper quarter of the profit zone, the biggest risk is a breakout to the upside. I considered the risk to be reasonably well contained as long as SPX did not take out the August 27th closing high of 1030.98. Leaving a little wiggle room, I set a mental stop of 1032. With yesterday’s close of 1033.37, therefore, I would close half of the straddle by buying back the at risk portion of the position, the calls. Ideally, this would have been done just prior to the end of trading yesterday or perhaps at today’s open.

The graphic below is a snapshot of the position as of yesterday’s close. The original premium was $5000 per contract. At the close of trading yesterday, the position could have been closed out for $3820, yielding a profit of $1180 per contract. This is down from a profit of $1490 a week ago today when the SPX was still hugging the 1000 level. The change in profitability in the past week has been largely the result of directional movement (delta) in the form of a 30 point jump in SPX more than offsetting the time decay at work over the course of the week.


[graphic: optionsXpress]

I see no reason to cover the short put side of the straddle, unless the SPX were to make a sharp move down. Using 1030 as resistance turning into support, one could plan to exit the puts if the SPX were to close below 1030. A lower SPX target might also make sense if I wanted to squeeze out some extra time decay (theta), from the short puts. If I were to take this approach, I would probably use a close (or perhaps intraday violation) of 1000 or below as my exit signal.

Note that in setting up my exits, I am completely ignoring the price of the actual options and prefer to focus on the underlying. In future posts, I will talk about a more holistic approach that encompasses not just the underlying, but also options prices, position Greeks and other factors.

For the record, the previous posts in this SPX short straddle series are:
  1. The Sideways Play
  2. SPX Short Straddle Still Hugging 1000 Level
An earlier two-part SPX short straddle case study may also be of interest:
  1. Is the SPX Going to Stick Close to 900?
  2. SPX Straddle Case Study Update
For additional posts on these subjects, readers are encouraged to check out:

Thursday, September 3, 2009

SPX Short Straddle Still Hugging 1000 Level

In many respects the ultimate pure play on declining volatility is a short straddle in which near the money puts and calls are sold simultaneously in hopes that the underlying will move very little prior to expiration. While this is largely a neutral directional bet, it is also a bet on declining volatility.

Two weeks ago today, in The Sideways Play, I outlined some of the logic and details behind what a short straddle trade would look like with the SPX at 1004. Two weeks later, with the SPX down a little more than five points, this trade is a winner. This trade is profiting from time decay (theta), which is currently at -1.20, meaning that all else being equal (i.e., if price, implied volatility and interest rates do not change), the position will gain $120 per day.

Of course, the other variables that affect the price of an option are in motion as well. Options traders use options Greeks to measure an option’s sensitivity to various influences on the value of that option, including the price of the underlying, the volatility of the underlying, time and interest rates.

Specific to the SPX short straddle, the increase in implied volatility (VIX) over the course of the past few days has worked against the options position. The Greek which measures an option’s sensitivity to changes in implied volatility is vega (not a Greek letter, but one that is counted as a ‘Greek’ according to options tradition), which estimates the change in value of an option that would result from a 1% change in the implied volatility of the underlying. In the two weeks, the VIX has increased 2.30 points and as the SPX straddle currently has a vega of 1.61, this means that the 2.30 point rise in the VIX has cost the position approximately $370 during the ten trading days.

While there are other factors at work on this short straddle trade, so far the main plot line has been a story of theta vs. vega, with time decay winning out.

The graphic below shows that a position which originally yielded $5000 in premium can now be bought back for $3510, which would lock in a profit of $1490. With the options expiring two weeks from tomorrow and time decay beginning to accelerate as we approach expiration, it will be interesting to see how this short straddle plays out.

For some related posts, try:

[graphic: optionsXpress]

Tuesday, July 14, 2009

Round Number Magnet Strangle

The power of round numbers does not seem to receive a lot of play in investment circles. Sure, there is the psychological significance of an index or a stock crossing above or below a round number, but I am surprised that nobody ever talks about how to trade these.

Rather than look as round numbers as potential areas of enhanced support or resistance, I like to think of them has having a strong attractive power, almost as if they are large magnets. In some indices and stocks, prices tend to linger near round numbers for longer periods than a random distribution would suggest.

One way to take advantage of the attractive tendencies of round numbers is to sell options at or near that strike. Straddles, strangles, butterflies and iron condors would certainly be appropriate choices, but I have personal preference for strangles, with their wide maximum profit zone and simple construction/position management.

These ‘magnet straddle’ plays can utilize options of any duration, but maximum time decay (theta) is achieved in the last few weeks prior to expiration. In the graphic below, which is courtesy of optionsXpress, I show that anyone interested in selling an 890-910 strangle on the SPX can make a profit if the index manages to stay in a 40 point zone (880-920) during the last three days prior to expiration.

I feel obliged to mention that conventional wisdom says expiration week is too fraught with short-term uncertainty and gamma risk to be traded profitably on a consistent basis, yet I still think there are a number of opportunities where probabilities favor the experienced options trader.

Finally, if this trade sounds somewhat familiar, readers may be interested in checking out a similar straddle trade in Is the SPX Going to Stick Close to 900? from last December. With a VIX in the upper 50s when the original trade was discussed, the profit zone of 840-960 makes it look like a slam dunk winner by current volatility standards.

[graphic: optionsXpress]

Friday, March 20, 2009

Can Selling Options Make You a Better Trader?

I used to have a list of trading rules guidelines taped to my monitor. The list went through several iterations, but near the top were always reminders that a good trader needs “patience and discipline” to be successful. The list is no longer there, but by now the important ideas have been branded into my psyche.

On a related note, over the course of the past few years I have increasingly gravitated toward trading options. More often than not I find myself selling options, either with or without a directional bias, and enjoying time decay (theta) work in my favor to increase my portfolio value. Recently, it occurred to me that selling options has made me a better trader because it has cut down on the number of trades I make and enhanced my patience and discipline. How does this happen? Each morning I look at my portfolio and see what my portfolio’s aggregate theta is. This tells me how much money I will make from time decay alone if the market does nothing and I do not make any trades. As a rule, I try to structure my portfolio so that the aggregate theta is at least as large as my daily profit target. For this reason, I never rarely feel obligated to “make something happen” and force trades that should not be taken.

While there are many approaches to trading, I believe that every trader should be comfortable trading long positions and short positions, buying options and selling options. Better yet, traders should not have a built in bias toward long-only trading or only buying calls. Ideally, a trader should be directionally agnostic and equally comfortable with the full menu of possible trades.

Ultimately, a considerable amount of trading success comes down to the “know thyself” dictum. A trader that understands his or her personality type, comfort zones and preferences can do a better job of applying the appropriate psychological approach to trading. These skills are some of the most difficult for many traders to master. It is quite possible that selling options may provide a shortcut to developing some of those skills.

For more on applying psychology to improve your trading, the best resource on the web is undoubtedly Brett Steenbarger’s TraderFeed.

For more on theta and time decay, check out Theta, an excellent overview of the subject at Know Your Options, a promising new options blog authored by Tyler Craig.

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