To profit from a stock price move up or down beyond the highest or lowest strike prices of the position.
Example of short Christmas tree spread with calls
|Sell 1 XYZ 95 call at 8.40||8.40|
|Buy 3 XYZ 105 calls at 2.35 each||(7.05)|
|Sell 2 XYZ 110 call at 0.95 each||1.90|
|Net credit =||3.25|
A short Christmas tree spread with calls is a three-part strategy involving six calls. If there are four strike prices, A, B, C and D, with A being the lowest, a short Christmas tree spread with calls is created by selling one call at strike A, skipping strike B, buying three calls at strike C and selling two calls at strike D. All calls have the same expiration date, and the four strike prices are equidistant.
In the example above, one 95 Call is sold, the 100 strike is skipped, three 105 Calls are purchased, and two 110 Calls are sold. The position is established for a net credit, and both the potential profit and maximum risk are limited.
This is an advanced strategy because “costs” are high. Given three strike prices and six options, there are multiple commissions and bid-ask spreads when opening the position and again when closing it. As a result, it is essential to open and close the position at “good prices.” It is also important to consider the per-contract commission rate since commissions will impact the return on investment.
The maximum profit potential is the net credit received when the position is established less commissions, and there are two possible outcomes in which a profit of this amount is realized. If the stock price is below the lowest strike price at expiration, then all calls expire worthless and the net credit is kept as income. Also, if the stock price is above the highest strike price at expiration, then all calls are in the money and the Christmas tree spread position has a net value of zero. As a result, the net credit less commissions is kept as income.
The maximum risk is equal to the difference between the lowest strike price (short call) and the strike price of the three long calls minus the initial net credit including commissions. This loss is realized if the stock price is at the strike price of the long calls at expiration.
In the example above, the difference between the lowest strike price and the strike price of the long calls is 10.00, and the initial net credit is 3.25, not including commissions. The maximum risk, therefore, is 6.75 less commissions.
Breakeven stock price at expiration
There are two breakeven points. The lower breakeven point is the stock price equal to the lowest strike price plus the net credit received for the position less commissions. In the example above, the lowest strike is 95 and the net credit received for the position is 3.25. The lower breakeven point at expiration, therefore, is 98.25 (95.00 + 3.25).
The upper breakeven point is the stock price equal to the highest strike price minus one-half of the net credit received. In the example above, the highest strike is 110 and the net credit received is 3.25, so the upper breakeven point at expiration is 108.375 (110.00 – 3.25/2).
Profit/Loss diagram and table: short Christmas Tree spread with calls
|Sell 1 XYZ 95 call at 8.40||8.40|
|Buy 3 XYZ 105 calls at 2.35 each||(7.05)|
|Sell 2 XYZ 110 call at 0.95 each||1.90|
|Net credit =||3.25|
|Stock Price at Expiration||Short 1 95 Call Profit/(Loss) at Expiration||Long 3 105 Calls Profit/(Loss) at Expiration||Short 2 110 Calls Profit/(Loss) at Expiration||Net Profit/(Loss) at Expiration|
Appropriate market forecast
A short Christmas Tree spread with calls realizes its maximum profit if the stock price is above the highest strike or below the lowest strike on the expiration date. The forecast, therefore, must be for “high volatility,” i.e., a price move outside the range of the strike prices of the spread.
Depending on the relationship of the stock price to the point of maximum loss (strike price of the three long calls), the forecast can have a directional bias. In the example above, if the stock price is 105 when the spread is established, then the stock must rise only five points to reach the upside point of maximum profit; however, the stock must fall 10 points to reach the downside point of maximum profit.
A short Christmas tree spread with calls is the strategy of choice when the forecast is for a stock price move outside the range of the highest and lowest strike prices. Unlike a long straddle or long strangle, however, the profit potential of a short Christmas tree spread is limited. Also, the commissions for a Christmas tree spread are considerably higher than for a straddle or strangle. The tradeoff is that a short Christmas tree spread has breakeven points much closer to the current stock price than a comparable long straddle or long strangle.
Short Christmas tree spreads differ from short butterfly spreads in two ways. First, the credit received for a short Christmas tree spread, and therefore the profit potential, is higher than for a short butterfly spread. Second, however, the range of loss for a short Christmas tree is wider than for a butterfly. Short Christmas tree spreads also differ from short skip-strike butterfly spreads. Short Christmas tree spreads have lower risk than short skip-strike butterfly spreads, but they also have lower profit potential.
Christmas tree spreads are sensitive to changes in the volatility in option prices, which is known as “implied volatility” (see Impact of Change in Volatility). The net price of a Christmas tree spread falls when implied volatility rises and rises when implied volatility falls. Consequently some traders open short Christmas tree spreads when they forecast that implied volatility will rise. Since implied volatility typically rises as an earnings announcement date approaches and then falls immediately after the announcement, some traders will sell a Christmas tree spread seven to ten days before an earnings report and then close the position on the day before the report. Success of this approach to selling Christmas tree spreads requires that either implied volatility rises or that the stock price rises or falls outside the strike price range. If the stock price remains constant and if implied volatility does not rise, then a loss will be incurred.
Patience is required because this strategy profits from a rising stock price, and stock price action can be unsettling as it rises and falls around the highest or lowest strike price as expiration approaches. Trading discipline is required, because, as expiration approaches, “small” changes in stock price can have a high percentage impact on the price of a Christmas tree spread. Traders must, therefore, be disciplined in taking partial profits if possible and also in taking “small” losses before the losses become “big.”
Impact of stock price change
“Delta” estimates how much a position will change in price as the stock price changes. Short calls have positive deltas, and short calls have negative deltas.
The net delta of a Christmas tree spread remains close to zero until two weeks or so before expiration. As expiration approaches, if the stock price is below the lowest strike price in a short Christmas tree spread with calls, then the net delta is slightly negative. If the stock price is above the highest strike price, then the net delta is slightly positive. Overall, a short Christmas tree spread with calls profits from a sharply rising or sharply falling stock price and is hurt by time decay if the stock price is near the strike price of the long calls.
Impact of change in volatility
Volatility is a measure of how much a stock price fluctuates in percentage terms, and volatility is a factor in option prices. As volatility rises, option prices tend to rise if other factors such as stock price and time to expiration remain constant. Short options, therefore, rise in price and make money when volatility rises, and short options rise in price and lose money when volatility rises. When volatility falls, the opposite happens; long options lose money and short options make money. “Vega” is a measure of how much changing volatility affects the net price of a position.
Short Christmas tree spreads with calls have a positive vega. This means that the price of a Christmas tree spread falls when volatility rises (and the short spread makes money). When volatility falls, the price of a Christmas tree spread rises (and the short spread loses money). Short Christmas tree spreads, therefore, should be opened when volatility is “low” and forecast to rise.
Impact of time
The time value portion of an option’s total price decreases as expiration approaches. This is known as time erosion. “Theta” is a measure of how much time erosion affects the net price of a position. Long option positions have negative theta, which means they lose money from time erosion, if other factors remain constant; and short options have positive theta, which means they make money from time erosion.
A short Christmas tree spread with calls has a net negative theta if the stock price is near the strike price of the long calls. If the stock price moves away from this strike price, however, the theta becomes positive as expiration approaches.
Risk of early assignment
Stock options in the United States can be exercised on any business day, and holders of short stock option positions have no control over when they will be required to fulfill the obligation. Therefore, the risk of early assignment is a real risk that must be considered when entering into positions involving short options.
While the long calls in a short Christmas tree spread have no risk of early assignment, the short calls do have such risk. Early assignment of stock options is generally related to dividends. Short calls that are assigned early are generally assigned on the day before the ex-dividend date. In-the-money calls whose time value is less than the dividend have a high likelihood of being assigned.
If one short call is assigned (most likely the lowest strike call), then 100 shares of stock are sold short and the long calls and the other short calls remain open. If a short stock position is not wanted, it can be closed in one of two ways. First, 100 shares can be purchased in the marketplace. Second, the short 100-share position can be closed by exercising the one of the long calls. Remember, however, that exercising a long call will forfeit the time value of that call. Therefore, it is generally preferable to buy shares to close the short stock position and then sell the long call. This two-part action recovers the time value of the long call. One caveat is commissions. Buying shares to cover the short stock position and then selling the long call is only advantageous if the commissions are less than the time value of the long call.
If more than one of the short calls is assigned – there are a total of three short calls – then either more shares can be purchased or one or both of the highest-strike long calls can be exercised. However, as discussed above, since exercising a long call forfeits the time value, it is generally preferable to buy shares to close the short stock position and then sell the long calls. The caveat, as mentioned above, is commissions. Buying shares to cover the short stock position and then selling the long calls is only advantageous if the commissions are less than the time value of the long calls.
Note, however, that whichever method is used, buying stock and selling the long call or exercising the long call, the date of the stock purchase will be one day later than the date of the short sale. This difference will result in additional fees, including interest charges and commissions. Assignment of a short option might also trigger a margin call if there is not sufficient account equity to support the stock position created.
Potential position created at expiration
The position at expiration of a short Christmas tree spread with calls depends on the relationship of the stock price to the strike prices of the spread.
If the stock price is below the lowest strike price, then all calls expire worthless, and no position is created.
If the stock price is above the lowest strike (short one call) and at or below the strike price of the three long calls, then the lowest strike short call is assigned and the other calls expire. The result is that 100 shares of stock are sold short and a stock position of short 100 shares is created.
If the stock price is above the strike of the three long calls and at or below the highest strike (short two calls), then the lowest-strike short call is assigned, the three long calls are exercised and the highest strike calls expire. The result is that 100 shares are sold and 300 shares are purchased. The net result is a position of long 200 shares.
If the stock price is above the highest strike, then all three long calls are exercised and all three short calls are assigned. The result is that 300 shares are purchased and 300 shares are sold. The net result is no position, although several stock buy and sell commissions have been incurred.
A short Christmas tree spread with calls can also be described as the combination of a “wide” bear call spread and two “narrow” bull call spreads. In the example above, the wide bear call spread is comprised of the short 95 Call and one of the long 105 Calls. The narrow bull call spreads are comprised of the two other long 105 Calls and the short two 110 Calls.
The term “Christmas tree” in the strategy name is thought to have originated from the profit-loss diagram. If the diagram is turned vertically, the uneven bulge on the diagram looks vaguely like one side of a Christmas tree.