In my younger days, I investing in a very concentrated portfolio. It wasn’t uncommon for me to have three or four stocks and at one time a single company made up about 90% of my portfolio.
Luckily, that didn’t lead to ruin, but it certainly wasn’t a smart way to run a portfolio.
As I enter my 30th year of investing 👴 , I’ve come to appreciate the stability of diversification and the acknowledgment that I may be wrong with any given investment idea. This willingness to be wrong is core to asymmetric investing and it also needs to be balanced with an appropriate level of diversification.
I don’t know who said it (if you do, please let me know), but this quote sums up how I think about diversification.
If I’m wrong, I only want a little and if I’m right, a little is enough.
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Let’s put some numbers to this simple comment.
Say there are only two outcomes for a stock over a 10 year period and you have to hold for the full 10 years.
Outcome 1: 10x in value, 20% probability
Outcome 2: 0x in value, 80% probability
The expected value of this portfolio will be a double over the course of a decade (EV = 10 × 0.2 + 0 × 0.8). But the range of outcomes is extremely wide depending on how diversified the portfolio is.
1 Stock Portfolio: 80% chance the portfolio goes to 0.
2 Stock Portfolio: 64% chance the portfolio goes to 0.
5 Stock Portfolio: 33% chance the portfolio goes to 0.
10 Stock Portfolio: 11% chance the portfolio goes to 0.
20 Stock Portfolio: 1% chance the portfolio goes to 0.
As an asymmetric investor, I’m looking for stocks with 10x to 100x outcomes in a decade. It would be great if I knew which stock was going to 10x, but the reality is this style of investing is inherently risky and there’s the possibility of a 0x return.
If I’m wrong, I don’t want to be all-in on a stock.
And if I’m right, a small position is big enough to have a big impact.
We saw this in 2024. Since I started tracking the Asymmetric Portfolio on Savvy Trader, there are 6 stocks that are up around 100%. 9 stocks had negative returns, including the ones I closed, out of 25 total positions in 2024.
The result has been doubling the performance of the market with a low batting average and high slugging percentage. $.SPX(.SPX)$
Building a Concentrated Portfolio
As much as I’m arguing against investing too much in a single stock, I’m not saying a single stock shouldn’t become a large percentage of a portfolio.
But that concentration should come naturally from value appreciation.
Today, 2 stocks each account for over 10% of the Asymmetric Portfolio. But most of those gains have come from their value appreciating over time. I haven’t bought shares of Spotify, which makes up 11.4% of the portfolio, since January 2024. Most of its growth is simply appreciation in value.
If gains continue, I would be comfortable letting a position grow to 20%, 30%, or even more of the portfolio.
But I’m not going to invest 20% of the portfolio into a single stock to build a position. If I’m right, a little is enough.
For me, that means a 3% to 5% position normally as a starting point. I may go higher in certain circumstances, but I want to have 20+ positions that will make a meaningful impact if they 10x in value. That’s the point of Asymmetric Investing, I just don’t know which stock is the one that will 10x over the next decade.
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