
2/12/2026 - Take a look at a six-month chart of XLE, the SPX energy sector. Now take a look at a six-month chart of XLB, the SPX raw materials sector. Compare those with a six-month chart of the financial (XLF) or consumer discretionary (XLY) sector. What we're seeing is a concentration of risk-taking among large institutions into those industries that will provide the basic materials for the AI boom. (Note similar strength among a number of the commodities and in the commodity index DBC overall). Other sectors of the market are not in decline, but have not been going much of anywhere for the last few months.
This is an example of thematic diversification. Large institutional investors base their investment decisions on themes that are supported by economic data, fundamental data within industries and companies, and by geopolitical developments. When they detect new themes, they often will shift funds out of certain assets and sectors of the market and into others. This thematic diversification requires active traders to track where funds are flowing, so that they can ride those waves. By trading different themes that are gaining interest, we are most likely to exploit opportunity even in overall markets that have been relatively flat.
Diversification enables us to go where the action is.
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2/11/2026 - Here's a simple example of how developing traders can diversify their trading and adapt to shifting market conditions. Since the summer of 2010, when I first began collecting the data, the correlation between the day's range in SPY and the VIX for that day has been .76. Think about what that means. To a statistically significant level, if we know how options are pricing volatility (VIX), we can anticipate the amount of directional movement within the trading day. Moreover, the SPY volume for that day correlates quite significantly with the size of the day's trading range.
What does that mean in practice? As we move forward in the trading day, we can track the relative volume of the market (how the volume for each minute of trading compares with the average volume for that minute) and we can track the level and direction of VIX. That tells us in real time whether we're likely to experience a day of big moves or a relatively narrow, choppy day. We can then adjust our trading accordingly--but only if we have diverse trading strategies: some that make money in momentum/breakout conditions, some that make money in reversal conditions, etc.
Like the football or basketball team, we see how the opponent's defense is aligned and we use that information to call the trading plays most likely to work. That can only happen if we have a diverse playbook to draw from: different edges for different situations. Once we develop such a playbook, the result is a sense of mastery: a positive trading psychology.
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2/10/2026 - Diversification, as explained below, means that we treat each day, week, month, and year as a portfolio of activities that are meaningful to us and that draw upon our best characteristics. There may be ups and downs in our relationships, in our P/L, in our health, etc., but over the entire life portfolio we are generating positivity. Putting all of our eggs in one basket leaves us vulnerable to blowups--in markets and in life.
But we achieve diversification over the course of our lifetimes as well. A career that is rewarding and fulfilling at one phase of life may give way to a different one as we mature. The joy of a romantic relationship will evolve into the joy of raising a family. I began my career as a full-time faculty member at a medical school and greatly enjoyed coordinating counseling services for the students. Over time, as my interest in markets grew, I saw that many of the approaches to psychology that I had been teaching and applying could be very relevant to helping traders with their performance. Still later, I began applying these methods not only to trading firms, but investment banks and large hedge funds. What might look like a happy and successful career is actually a succession of careers.
What that means is that if we are to live diversified lives, we have to be able to let go of one set of activities to move on to others. In a very important sense, every life activity--including trading--needs a stop level. If we never stop out of what we're doing, we never transition to what can lie ahead. Becoming too attached to any life activity--including trading--prevents us from finding what we're meant to be doing. As I mentioned during our visit to Devon in Colorado, the point at which we grow old is the point at which we determine our best years are behind us. Only when we can stop out of activities that we outgrow can we rejuvenate with fresh challenges.
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2/9/2026 - One of the greatest mistakes traders make is working on their development by focusing on their negative emotions and performance. If you keep emphasizing everything you do wrong, you eventually internalize the sense of being a f*ck up. Correcting errors is certainly necessary for performance improvement, but it is not sufficient.
A major theme of the Positive Trading Psychology book that will be coming out later this month is that we grow by leveraging our strengths and finding ways to trade that draw upon the best of who we are. Every truly successful trader I've worked with has succeeded by bringing talents and skills from previous accomplishments and adapting these to markets. When we draw upon what we do best and what means the most to us, our efforts give energy--and that energizes our creative search for opportunity.
So how is this related to diversification? All of us possess a portfolio of experiences, skills, and abilities. Life success comes from drawing upon these in everything we do: relationships, leisure activity, career efforts, trading, family life, etc. A way of viewing this diversification is to ask: What will make today a great success even if my P/L is down for the day? A diversified life gives us so many ways to win that each day brings us energy and well-being.
How we live eventually shapes how we trade.
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2/8/2026 - Investors and active day traders achieve diversification differently. An investor creates a portfolio of positions with positive expected return, where these positions are not highly correlated with one another. One bet might be on economic strength in emerging markets vs. developed markets and could be expressed with a position that is long EEM and short SPX. Another bet might be a long position in crude oil, expressing a view of economic growth/demand and weather-related demand. Capital is divided among these different positions, so that the combination can make money even if individual views prove incorrect. This diversification requires knowledge of multiple markets/stocks and strategies. Its goal is not only solid absolute returns, but a smooth curve of returns buffering losses (i.e., high Sharpe ratio).
The active day trader achieves diversification by trading many instruments in a given day and trading different patterns among those instruments. Thus, I could be long the ES futures on an anticipated morning breakout and then I could trade an individual stock short based on flows moving out of its sector and toward others. Still another trade might be a volatility bet expressed through options by purchasing a straddle. Diversification is achieved sequentially rather than simultaneously in a portfolio.
Understanding how diversification balances our returns helps us appreciate how diversification balances our mindset. When we have multiple ways to adapt to ever-changing markets, we achieve a higher level of control over our returns. One of the most common--and least appreciated--sources of emotional disruption of trading is our rigidity: our failure to adapt to shifting opportunity sets in markets.
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2/6/2026 - We get married to benefit from a concentrated investment. We have friends, family, and colleagues to benefit from multiple investments, each of which pays off uniquely. Together, our concentrated efforts and our diverse efforts make for a deep life and a broad and stimulating life. So it is within our careers. To succeed, we typically need to concentrate on an area of expertise where we bring unique depth and value. We also have to apply our knowledge broadly enough to ensure that we're learning from new challenges and applying our expertise as widely as possible.
Success is a function of breadth and depth. We need enough variety to keep life interesting and stimulating; we need enough depth to make our efforts not just successful, but meaning-full.
I've been hearing from a number of portfolio managers and traders who have benefited recently from concentrated bets in growth areas of the stock market, but who have been losing money lately. This has shaken their confidence and will make it difficult to reengage when opportunity arises. So much of what happens in the stock market--and across global equity, currency, and rates markets--is a rotation of assets out of one area and into others. Notice in the US stock market how raw materials and energy shares have been strong, but tech stocks have been weak. Just a matter of months ago, that was hardly the case!
Diversification means that we have the tools to find opportunity in multiple markets and the flexibility to deploy resources in those different areas. When we don't just have an edge, but a set of edges that are unique (not highly correlated with one another), we create a much smoother equity curve. Balancing the ups and downs of our returns is crucial to preserving a positive psychology.
The more we can achieve consistency of returns, the more likely it will be that we can maintain a consistent mindset.