12/17/2025

Weekly Note - December 17, 2025

Performance Review

The table below shows performance figures for 2025 through last Friday (Dec 12) for two accounts following Focused 15 model portfolios, along with several alternative investments. The account following the Main model portfolio, shown in the gold box, returned 14.0 percent. A measure of risk, defined as the variability of weekly returns and indicated by the standard deviation, was 5.9 percent. The ratio of return to risk for the year to date is therefore 2.4.

Return indicates how your account grows over time, and higher is better. The 14.0 percent return is similar to that of the Dow Jones Industrial Average ETF, DIA, and the Schwab Balanced Fund with a 60 percent stock and 40 percent bond allocation, SWBGX. This result is generally consistent with expectations for the Main Focused 15 portfolio.

The variability of returns indicates how smoothly the account grows over time. Lower variability is better. Although variability is more abstract than return, it is useful for comparisons across investments. The 5.9 percent variability for the Main model portfolio is less than half that of the DJIA ETF and slightly lower than that of the most conservative Schwab fund, which has a 40 percent stock and 60 percent bond mix, SWCGX. It is lower than all of the alternative investments shown.


Year to date through December 12, 2025

Return

Variability (standard deviation of returns)

Return / Variability

Main Model portfolio

14.0%

5.9%

2.4

Main +1 Model Portfolio

15.6%

na

na

DJIA ETF “DIA”

14.1%

16.2%

0.9

SP500 ETF “IVV”

16.4%

17.3%

0.9

NASDAQ ET “QQQ”

20.0%

21.9%

0.9

40% Stock / 60% Bond Mix “SWCGX”

9.9%

6.7%

1.5

60% Stock / 40% Bond Mix “SWBGX”

14.4%

8.5%

1.7

80% Stock / 20% Bond Mix “SWCHGX”

17.1%

10.0%

1.7

The combination of strong returns and low variability results in a high return-to-variability ratio of 2.4, which is significantly higher than the alternatives listed. This indicates that the Focused 15 portfolios have delivered high returns for the level of variability incurred.

This information is useful for several reasons. First, it suggests that the portfolios have been successful in avoiding losses while participating in stock market gains, which is the objective of the trading process.

Second, the high ratio suggests that the investment process may continue to reduce losses going forward.

Third, the lower level of variability allows investors to more comfortably use a more aggressive model portfolio than they otherwise would. By following a more aggressive Focused 15 model portfolio one can get higher returns and still have a level of variability that is comparable to the Schwab balanced funds, which are often used for retirement accounts.

One account I monitor uses a model portfolio that is always one step more aggressive than whatever model portfolio is designated as the Main portfolio. The aggressiveness of this account can be described as “Main  +1.”  That account returned 15.6 percent for the year-to-date period, which gives it higher returns than the fund “SWBGX.” Unfortunately, comparable variability-related data are not available for this account.

Selecting a Level of Aggressiveness

For those with a relatively short investment horizon, the Main model portfolio, which I personally use, may be appropriate. For those with longer investment horizons, such as investors in their 20s and 30s, more aggressive portfolios that are always one or two steps more aggressive than the Main model portfolio may be appropriate. See page 3 of the weekly report for return and variability information for the full range of model portfolios. 

Over the course of 2026, the gold box representing the Main model portfolio may shift to take advantage of the market dynamics described below. You only need to remember how many steps above or below the Main model portfolio you have selected as your long-term position.

2026 Outlook

I do not usually provide a 12-month outlook, but 2026 is likely to be unusual. The information below does not require you to change anything about how your account is managed, other than continuing to follow your selected level of aggressiveness (e.g., Main +1, or Main +2).

If historical precedents over the past 100 years continue to apply, the stock market is likely to experience a boom-and-bust pattern over the next 12 months. There have been 13 such episodes since 1935, with the most recent occurring in 2017 and 2018. One of the largest episodes in recent memory was in 1987. The DJIA peaked in August of 1987 following a 54 percent gain over the prior 12 months. After this market boom, the DJIA experienced a 35 percent loss over the following four months.

The next boom is likely to begin over the next several weeks and will reach its peak in approximately May of 2026. Depending on the strength of the boom, I may shift the Main model portfolio to a more aggressive model portfolio.  

Research on Physics-based Drivers of Investor Sentiment

The forecast above is based on over 90 years of long-term cycles in stock market performance and their relationship to solar energy variation. A paper describing this research is available on a preprint service at the following location.

       https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5482086

Feel free to download the report and to forward the link to anyone who might find the information useful. 

To date, I have not changed the investment process based on this research. The research findings however, make implementing the target weights less stressful. They help us identify when the market is performing as expected and when it may be vulnerable to declines if economic conditions require a rapid adjustment in stock prices. At times, these periods of naturally occurring vulnerability can be anticipated several months in advance. The potential 2026 boom-and-bust episode is one such case.

Historically, the Focused 15 algorithms have been successful in participating in market booms. Busts, however, tend to begin abruptly, and the algorithms typically take a few weeks to adapt to the rapid shift toward negative investor sentiment. At this time, we cannot know how strong the boom might be or how severe a subsequent bust could become. The magnitude depends on economic and market conditions at the time. The timing of periods of vulnerability, however, is driven by naturally occurring cycles of investor sentiment described in the paper. As a result, we have a reasonably good sense of when the market is most vulnerable to a downturn.

We will not make a change based only on this research. Any boom will need to be identified and confirmed by the Market Resilience Indexes (MRI). As of this writing, the Macro MRI is shifting to a more positive trend, which could indicate the beginning of the boom. 

If historical precedents hold, market returns are likely to strengthen in January or February and continue through the spring, with a potential peak in late May or early June. June and July are likely to be periods of heightened vulnerability to a market decline. If economic conditions remain positive, the market may recover quickly, followed by a final vulnerable period toward the end of the year.

With this perspective, I currently expect to make these changes once it is clear that the boom period has begun:

1.      Increase aggressiveness of accounts for the several months prior to the peak, beginning at the end of 2025 or early 2026.

2.      End that period of aggressiveness just before the expected peak of naturally occurring resilience, roughly mid-May. 

3.      Increase aggressiveness in July.

4.      Decrease in late December or early January 2027

You do not need to take any unusual action during these shifts. Simply continue to follow your selected level of aggressiveness relative to the Main model portfolio (e.g., Main +1, Main +2). Also watch for a change in the Box #2 Cash level, which may change if the markets appear to be making an abrupt decline close to an expected period of naturally occurring vulnerability. 

Again, please let me know if you would like to have a call to discuss these issues. 

The table below shows the 13 boom-and-bust episodes since 1935.