How Market Breadth Reveals the Strength of a Rally
While major stock market indexes get all the headlines these days, the performance of those indexes does not necessarily tell the full story about the market’s health. It’s possible for an index to hit all the major highs while only a few companies are driving that market rally. Professional investors monitor market breadth to gain a more complete understanding of the market.
Market breadth refers to the number of different securities that participate in a given market movement. By looking beyond the information provided by the stock market index, investors can determine how widespread or concentrated the rally for the market’s stocks is. Market breadth can provide additional context to the strength of market trends.
What Is Market Breadth?
Market breadth is a figure that represents the number of different securities participating in the market’s advance or decline. Rather than monitoring the performance of the major indexes, investors that use market breadth analysis can monitor the number of advancing stocks, declining stocks, stocks hitting new 52-week highs, stocks hitting new 52-week lows, trading volume, and the participation of various sectors of the market. A higher number of advancing and high-producing stocks indicates healthier market conditions than the rally of only a few companies.
Why Market Breadth Matters
A broad range of stocks participating in the market’s gains indicates that there is confidence among investors in the market's overall prospects. Strong market breadth can mean that investors are confident in the economy as a whole, that the companies they own are doing well financially, that there is a demand for the stocks in the market, and that the rally investors are seeing is sustainable. Poor market breadth can suggest that investors are placing their money into only a few companies rather than spreading it across the market as a whole. This can indicate a potential problem in the market that investors should be aware of.
Advance-Decline Ratio
One of the most common indicators of market breadth is the advance-decline ratio. This ratio compares the number of stocks that are rising in price to the number of stocks declining in price for a specific trading session. If there are more advancing stocks than declining stocks for a market, this indicates that the market as a whole is experiencing positive participation. Conversely, if there are more declining stocks than advancing stocks, the market may be experiencing a weakening trend in its advancing stocks despite the market index’s rising value.
New Highs vs. New Lows
Another indicator that investors use to analyze market breadth is the number of companies hitting new highs compared to the number hitting new lows in a specific time period. When markets are healthy, most companies will hit new highs rather than new lows. If only a few companies are hitting new highs, while the majority of companies are hitting new lows, investors may begin to question whether the rally for the market’s stocks is sustainable.
Sector Participation Matters
Investors look at the participation of different market sectors to determine whether a market rally is sustainable. A strong rally that is driven by several market sectors is more likely to be sustainable than one that emerges from only a few industries.
Rotating leadership between different market sectors is generally considered to be a positive development in the market.
Large-Cap Concentration Can Distort Indexes
The major stock market indexes are weighted according to the market value of the companies that are listed on the index. This means that a few of the largest companies can impact the index value significantly. It is possible for the index to rise while most companies in the market are declining in value. Breadth indicators can tell investors of these situations.
Combining Breadth With Other Market Indicators
Professional investors use market breadth indicators in conjunction with other market analyses to form a complete picture of the stock market and its prospects. These additional analyses consider company earnings, economic indicators, valuation metrics, trading volume, interest rates, and market sentiment.
Limitations of Market Breadth Analysis
As with any indicator of market trends, market breadth analysis has some limitations. One limitation is that market breadth indicators may only reflect the gains of a few industries rather than the entire market. Another limitation is that they are subject to market and investor sentiment during specific time periods. Finally, the indicators are subject to the differences in construction between market indices.
How Investors Can Use Market Breadth Analysis
While investors can use market breadth to gain an understanding of the trends of the market, there is no need to use this indicator to time the market. Rather, long-term investors can use this indicator to improve their understanding of market trends without trying to time the market.
Key Takeaways
Market breadth measures how many stocks participate in a market rally. The more companies that participate in the market movement, the healthier the market is considered to be. Advancing stocks and declining stocks, new highs, new lows, trading volume, and sector participation can all be indicators used to analyze market breadth. The rally of the market’s large-cap companies can mask the weakness of the smaller companies listed on the market indices. Market breadth analysis combines well with analyses of the companies listed on the markets, as well as with economic analyses of the market as a whole. Professional investors use market breadth analyses as an additional tool to understand the strength of the market’s trends.
Conclusion
Market breadth gives investors a more detailed understanding of the markets by looking beyond the stock market index values. While the strong performances of the market indices get the attention of investors, the widespread participation of the industries and companies listed on the market indices is generally a better indicator of the health of the market. By including market breadth analysis into their understanding of the market, investors can gain a better understanding of market trends and make more informed investment and portfolio management decisions.