## The Risks of Owning an Individual Stock

#### The Risks of Owning an Individual Stock

May 21, 2015 Uncategorized
(Last Updated On: January 18, 2017)

How risky is it to buy an individual stock?

This is a question investors should ask themselves when deciding to buy a single stock. However, many investors tend to get caught up in the story about why company XYZ is going to double over the next year.

As an educated investor, it makes sense to know the odds table. What we hope to do here is present a distribution of the total returns one would have earned by owning an individual stock.

### The Tests:

The distribution is generated over two time periods.  The first period is 1/1/1983 – 12/31/2006 and the second period is 1/1/2007 – 12/31/2014. The universe is created on 12/31/1982 (and 12/31/2006) by selecting the top 3000 stocks ranked by market capitalization. The initial universe is then compared to owning the Russell 3000 index. We examine the excess returns an investor would have earned by owning one stock compared to the universe.

The excess return is computed monthly by taking the stock’s total return and subtracting off the index return. So if stock XYZ earned 10% in January, while the Russell 3000 index earned 4%, the “excess return” for the month would be 10% – 4% = 6%. For each stock, we then compute the cumulative excess return over time, by compounding the monthly excess returns.

The results are shown below:

### Takeaways:

• Around 63% of individual stocks underperform! This means that only 37% of individual stocks outperform the benchmark!
• The probability of beating the benchmark by more than 100% is only 11%!

### Takeaways:

• Around 54% of individual stocks underperform! This means that only 46% of individual stocks outperform the benchmark!
• The probability of beating the benchmark by more than 100% is only 10%!

So while it appears that the more recent time period was better for stock pickers, the odds were still against buying an individual stock. An additional concern when buying one stock is that the investor takes on a lot of idiosyncratic risk. This can lead to larger drawdowns if there is bad news about your one stock portfolio. Here we examine the (gross) drawdowns of individual stocks.

### Lifetime Rolling 5-Year Maximum Drawdowns:

To be included in the analysis, we require stocks to have at least 5 years of performance data.

### Takeaways:

• Between 1983 and 2006, around 73% of firms had a drawdown of larger than 50% (the SP500’s MaxDD during this period is around 44%).  From 2007 – 2014, this number is 82% (the SP500’s MaxDD during this period is around 50%). Holding one individual stock can be very risky!

### Conclusion

Buying an individual stock can be risky, and beating the market is difficult. Individual stock picking can also lead to large drawdowns, which are hazardous to one’s wealth. Hopefully, armed with our odds table above, we all form nice diversified portfolios!

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Definitions of common statistics used in our analysis are available here (towards the bottom)

#### Yang Xu

Mr. Xu is currently a managing member of Alpha Architect, where he leads the capital markets group and assists in quantitative research. Mr. Xu has unique skills related to "big data" analysis. His recent research investigates various proprietary trading algorithms, tactical asset allocation models, and longer-term security selection models. Prior to joining Alpha Architect, Mr. Xu was a Principal Data Analyst at Capital One, where he was a member of the Basel II data analysis team. Mr. Xu graduated from Drexel University with a M.S. in Finance, and from the University of International Business and Economics in Beijing, China, where he earned a BA in Economics.

• dph

Yang, any insights on whether the few 1 in 10 stocks that beat the market buy 100%+ show more or less volatility than the other 90%?

• Yang Xu

great question. let me dig in and get back to you. whats your bet?

• dph

I’ve seen studies where low volatility can outperform so I’m going with that one. I’d think the winners, if you’re lucky enough to have one, might be a smoother ride. Thus that could explain the few who have 20+ year holdings periods and don’t tinker (Berkshire types). But I could be way off too. =)

• gary

Your conclusion is perfect. You can certainly get lucky from time to time but over the long haul being diversified works. There are many usable ideas like buy when everyone is selling, etc., etc., but while they can deliver in the short run, investing is a long game. There will always be times when you will feel like a genius (2010-2015 for me) but also times you will feel the opposite. If you can control your emotions, better things will happen.