The Nations NDX PutWrite Index and Correlation to the Nasdaq-100 Index
The Nations NDX PutWrite Index closed at 969.79 on Wednesday, October 30, up 14.88 percent for the year to date.
The options used in the Nations NDX PutWrite Index are NDX options (You can learn more about NDX options here: https://www.nasdaqtrader.com/content/phlx/NDXProductSheet.pdf). NDX options are options on the Nasdaq-100 index itself. NDX options are cash-settled meaning that at option expiration settlement is made by the payment or receipt of cash rather than exchange of actual shares of stock since that exchange would be unwieldy. NDX options, and the smaller NQX options, are great tools for hedger and investors.
Any PutWrite index is going to be less volatile than the underlying asset it tracks because the movement of the put option is muted in comparison to the underlying asset. For example, the Nasdaq-100 Index closed at 8083.11 on Wednesday. If the index were to rally 1 point to 8084.11 an owner of the index would have made 1 point. But an at-the-money option wouldn’t move in price by the same 1 point because there’s still substantial doubt about the option being in-the-money at expiration; the option would move by something less than 1 point. That’s why the Nations NDX PutWrite Index has an historical beta of 51 meaning the magnitude of its movements is about 51 percent those of the underlying NDX Index.
So a PutWrite moves less than the underlying asset. Another important question is, do the two move in the same direction? They do move in the same direction which is what makes a PutWrite a good, lower risk, proxy for the underlying asset. From the beginning of 1994 through the end of September 2019 the correlation of the Nasdaq-100 Index and the Nations NDX PutWrite is 83 percent. Why isn’t the correlation 100 percent? Because of the diversification injected by issues like the erosion of the put options over time. That erosion not only reduces the correlation slightly, it also adds risk-adjusted return to the PutWrite Index.
The put option that has been shorted in a PutWrite moves somewhat less than the underlying index. In the option world this sensitivity to the movement of the underlying index is called delta. There is a huge range of NDX strike prices in each expiration and each strike price has a slightly different delta (movement relative to the underlying NDX Index) meaning there is an NDX option for every market thesis. Issues like the time decay of option prices also inform any option strategy but delta is going to be the critical consideration for many strategies.
The Nations NDX PutWrite Index sells put options which are just below at-the-money at initiation meaning the strike price of the option is just below the current level of the Nasdaq-100 index when the options are sold. Thus, these options initially move about 50 percent as much as the Nasdaq-100 Index. That relationship will change as the Nasdaq-100 Index moves and as time passes but these options are the ones sold because they have the most time value.
The important consideration is that there is a range of strike prices available for those investors interested in executing their own Nasdaq-100 PutWrite strategy and each will have a unique correlation to the underlying Nasdaq-100 Index.