Stock Investing 101 – Price-to-Earnings Ratio (PE Ratio)

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Price-to-Earnings Ratio – P/E Ratio

What Is Price-to-Earnings Ratio – P/E Ratio?

The price-to-earnings ratio (P/E ratio) is the ratio for valuing a company that measures its current share price relative to its per-share earnings (EPS). The price-to-earnings ratio is also sometimes known as the price multiple or the earnings multiple.

P/E ratios are used by investors and analysts to determine the relative value of a company’s shares in an apples-to-apples comparison. It can also be used to compare a company against its own historical record or to compare aggregate markets against one another or over time.

Key Takeaways

  • The price-earnings ratio (P/E ratio) relates a company’s share price to its earnings per share.
  • A high P/E ratio could mean that a company’s stock is over-valued, or else that investors are expecting high growth rates in the future.
  • Companies that have no earnings or that are losing money do not have a P/E ratio since there is nothing to put in the denominator.
  • Two kinds of P/E ratios – forward and trailing P/E – are used in practice.

P/E Ratio Formula and Calculation

Analysts and investors review a company’s P/E ratio when they determine if the share price accurately represents the projected earnings per share. The formula and calculation used for this process follow.

To determine the P/E value, one simply must divide the current stock price by the earnings per share (EPS). The current stock price (P) can be gleaned by plugging a stock’s ticker symbol into any finance website, and although this concrete value reflects what investors must currently pay for a stock, the EPS is a slightly more nebulous figure.

EPS comes in two main varieties. The first is a metric listed in the fundamentals section of most finance sites; with the notation “P/E (TTM),” where “TTM” is a Wall Street acronym for “trailing 12 months.” This number signals the company’s performance over the past 12 months. The second type of EPS is found in a company’s earnings release, which often provides EPS guidance. This is the company’s best-educated guess of what it expects to earn in the future.

Sometimes, analysts are interested in long term valuation trends and consider the P/E 10 or P/E 30 measures, which average the past 10 or past 30 years of earnings, respectively. These measures are often used when trying to gauge the overall value of a stock index, such as the S&P 500 since these longer term measures can compensate for changes in the business cycle. The P/E ratio of the S&P 500 has fluctuated from a low of around 6x (in 1949) to over 120x (in 2009). The long-term average P/E for the S&P 500 is around 15x, meaning that the stocks that make up the index collectively command a premium 15 times greater than their weighted average earnings.

Forward Price-To-Earnings

These two types of EPS metrics factor into the most common types of P/E ratios: the forward P/E and the trailing P/E. A third and less common variation uses the sum of the last two actual quarters and the estimates of the next two quarters.

The forward (or leading) P/E uses future earnings guidance rather than trailing figures. Sometimes called “estimated price to earnings,” this forward-looking indicator is useful for comparing current earnings to future earnings and helps provide a clearer picture of what earnings will look like – without changes and other accounting adjustments.

However, there are inherent problems with the forward P/E metric – namely, companies could underestimate earnings in order to beat the estimate P/E when the next quarter’s earnings are announced. Other companies may overstate the estimate and later adjust it going into their next earnings announcement. Furthermore, external analysts may also provide estimates, which may diverge from the company estimates, creating confusion.

Trailing Price-To-Earnings

The trailing P/E relies on past performance by dividing the current share price by the total EPS earnings over the past 12 months. It’s the most popular P/E metric because it’s the most objective – assuming the company reported earnings accurately. Some investors prefer to look at the trailing P/E because they don’t trust another individual’s earnings estimates. But the trailing P/E also has its share of shortcomings – namely, a company’s past performance doesn’t signal future behavior.

Investors should thus commit money based on future earnings power, not the past. The fact that the EPS number remains constant, while the stock prices fluctuate, is also a problem. If a major company event drives the stock price significantly higher or lower, the trailing P/E will be less reflective of those changes.

The trailing P/E ratio will change as the price of a company’s stock moves, since earnings are only released each quarter while stocks trade day in and day out. As a result, some investors prefer the forward P/E. If the forward P/E ratio is lower than the trailing P/E ratio, it means analysts are expecting earnings to increase; if the forward P/E is higher than the current P/E ratio, analysts expect a decrease in earnings.

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Valuation From P/E

The price-to-earnings ratio or P/E is one of the most widely-used stock analysis tools used by investors and analysts for determining stock valuation. In addition to showing whether a company’s stock price is overvalued or undervalued, the P/E can reveal how a stock’s valuation compares to its industry group or a benchmark like the S&P 500 Index.

In essence, the price-to-earnings ratio indicates the dollar amount an investor can expect to invest in a company in order to receive one dollar of that company’s earnings. This is why the P/E is sometimes referred to as the price multiple because it shows how much investors are willing to pay per dollar of earnings. If a company was currently trading at a P/E multiple of 20x, the interpretation is that an investor is willing to pay $20 for $1 of current earnings.

The P/E ratio helps investors determine the market value of a stock as compared to the company’s earnings. In short, the P/E ratio shows what the market is willing to pay today for a stock based on its past or future earnings. A high P/E could mean that a stock’s price is high relative to earnings and possibly overvalued. Conversely, a low P/E might indicate that the current stock price is low relative to earnings.

Example of the P/E Ratio

As a historical example, let’s calculate the P/E ratio for Walmart Stores Inc. (WMT) as of November 14, 2020, when the company’s stock price closed at $91.09. The company’s profit for the fiscal year ending January 31, 2020, was US$13.64 billion, and its number of shares outstanding was 3.1 billion. Its EPS can be calculated as $13.64 billion / 3.1 billion = $4.40.

Walmart’s P/E ratio is, therefore, $91.09 / $4.40 = 20.70x.

Investor Expectations

In general, a high P/E suggests that investors are expecting higher earnings growth in the future compared to companies with a lower P/E. A low P/E can indicate either that a company may currently be undervalued or that the company is doing exceptionally well relative to its past trends. When a company has no earnings or is posting losses, in both cases P/E will be expressed as “N/A.” Though it is possible to calculate a negative P/E, this is not the common convention.

The price-to-earnings ratio can also be seen as a means of standardizing the value of one dollar of earnings throughout the stock market. In theory, by taking the median of P/E ratios over a period of several years, one could formulate something of a standardized P/E ratio, which could then be seen as a benchmark and used to indicate whether or not a stock is worth buying.

P/E vs. Earnings Yield

The inverse of the P/E ratio is the earnings yield (which can be thought of like the E/P ratio). The earnings yield is thus defined as EPS divided by the stock price, expressed as a percentage.

If Stock A is trading at $10, and its EPS for the past year was 50 cents (TTM), it has a P/E of 20 (i.e., $10 / 50 cents) and an earnings yield of 5% (50 cents / $10). If Stock B is trading at $20 and its EPS (TTM) was $2, it has a P/E of 10 (i.e., $20 / $2) and an earnings yield of 10% ($2 / $20).

The earnings yield as an investment valuation metric is not as widely used as its P/E ratio reciprocal in stock valuation. Earnings yields can be useful when concerned about the rate of return on investment. For equity investors, however, earning periodic investment income may be secondary to growing their investments’ values over time. This is why investors may refer to value-based investment metrics such as P/E ratio more often than earnings yield when making stock investments.

The earnings yield is also useful in producing a metric when a company has zero or negative earnings. Since such a case is common among high-tech, high growth, or start-up companies, EPS will be negative producing an undefined P/E ratio (sometimes denoted as N/A). If a company has negative earnings, however, it will produce a negative earnings yield, which can be interpreted and used for comparison.

P/E vs. PEG Ratio

A P/E ratio, even one calculated using a forward earnings estimate, don’t always tell you whether or not the P/E is appropriate for the company’s forecasted growth rate. So, to address this limitation, investors turn to another ratio called the PEG ratio.

A variation on the forward P/E ratio is the price-to-earnings-to-growth ratio, or PEG. The PEG ratio measures the relationship between the price/earnings ratio and earnings growth to provide investors with a more complete story than the P/E on its own. In other words, the PEG ratio allows investors to calculate whether a stock’s price is overvalued or undervalued by analyzing both today’s earnings and the expected growth rate for the company in the future. The PEG ratio is calculated as a company’s trailing price-to-earnings (P/E) ratio divided by the growth rate of its earnings for a specified time period. The PEG ratio is used to determine a stock’s value based on trailing earnings while also taking the company’s future earnings growth into account, and is considered to provide a more complete picture than the P/E ratio. For example, a low P/E ratio may suggest that a stock is undervalued and therefore should be bought – but factoring in the company’s growth rate to get its PEG ratio can tell a different story. PEG ratios can be termed “trailing” if using historic growth rates or “forward” if using projected growth rates.

Although earnings growth rates can vary among different sectors, a stock with a PEG of less than 1 is typically considered undervalued since its price is considered to be low compared to the company’s expected earnings growth. A PEG greater than 1 might be considered overvalued since it might indicate the stock price is too high as compared to the company’s expected earnings growth.

Absolute vs. Relative P/E

Analysts may also make a distinction between absolute P/E and relative P/E ratios in their analysis.

Absolute P/E

The numerator of this ratio is usually the current stock price, and the denominator may be the trailing EPS (TTM), the estimated EPS for the next 12 months (forward P/E) or a mix of the trailing EPS of the last two quarters and the forward P/E for the next two quarters. When distinguishing absolute P/E from relative P/E, it is important to remember that absolute P/E represents the P/E of the current time period. For example, if the price of the stock today is $100, and the TTM earnings are $2 per share, the P/E is 50 ($100/$2).

Relative P/E

The relative P/E compares the current absolute P/E to a benchmark or a range of past P/Es over a relevant time period, such as the past 10 years. The relative P/E shows what portion or percentage of the past P/Es the current P/E has reached. The relative P/E usually compares the current P/E value to the highest value of the range, but investors might also compare the current P/E to the bottom side of the range, measuring how close the current P/E is to the historic low.

The relative P/E will have a value below 100% if the current P/E is lower than the past value (whether the past high or low). If the relative P/E measure is 100% or more, this tells investors that the current P/E has reached or surpassed the past value.

Limitations of Using the P/E Ratio

Like any other fundamental designed to inform investors on whether or not a stock is worth buying, the price-to-earnings ratio comes with a few important limitations that are important to take into account, as investors may often be led to believe that there is one single metric that will provide complete insight into an investment decision, which is virtually never the case. Companies that aren’t profitable, and consequently have no earnings—or negative earnings per share, pose a challenge when it comes to calculating their P/E. Opinions vary on how to deal with this. Some say there is a negative P/E, others assign a P/E of 0, while most just say the P/E doesn’t exist (not available—N/A) or is not interpretable until a company becomes profitable for purposes of comparison.

One primary limitation of using P/E ratios emerges when comparing P/E ratios of different companies. Valuations and growth rates of companies may often vary wildly between sectors due both to the differing ways companies earn money and to the differing timelines during which companies earn that money.

As such, one should only use P/E as a comparative tool when considering companies in the same sector, as this kind of comparison is the only kind that will yield productive insight. Comparing the P/E ratios of a telecommunications company and an energy company, for example, may lead one to believe that one is clearly the superior investment, but this is not a reliable assumption.

Other P/E Considerations

An individual company’s P/E ratio is much more meaningful when taken alongside P/E ratios of other companies within the same sector. For example, an energy company may have a high P/E ratio, but this may reflect a trend within the sector rather than one merely within the individual company. An individual company’s high P/E ratio, for example, would be less cause for concern when the entire sector has high P/E ratios.

Moreover, because a company’s debt can affect both the prices of shares and the company’s earnings, leverage can skew P/E ratios as well. For example, suppose there are two similar companies that differ primarily in the amount of debt they take on. The one with more debt will likely have a lower P/E value than the one with less debt. However, if business is good, the one with more debt stands to see higher earnings because of the risks it has taken.

Another important limitation of price-to-earnings ratios is one that lies within the formula for calculating P/E itself. Accurate and unbiased presentations of P/E ratios rely on accurate inputs of the market value of shares and of accurate earnings per share estimates. The market determines the prices of shares through its continuous auction. The printed prices are available from a wide variety of reliable sources. However, the source for earnings information is ultimately the company themselves.This single source of data is more easily manipulated, so analysts and investors place trust the company’s officers to provide accurate information. If that trust is perceived to be broken the stock will be considered more risky and therefore less valuable.

To reduce the risk of inaccurate information, the P/E ratio is but one measurement that analysts scrutinize. If the company were to intentionally manipulate the numbers to look better, and thus deceive investors, they would have to work strenuously to be certain that all metrics were manipulated in a coherent manner, which is difficult to do. That’s why the P/E ratio continues to be one of the centrally referenced points of data to analyze a company, but by no means the only one.

Price-to-Earnings Ratio (P/E Ratio)

The price-to-earnings ratio, or simply P/E ratio, is a often used metric in stock valuation. Also known as earnings multiple, multiple, or simply p/e (or pe).

The P/E ratio is obtained by dividing the price per share by the earnings per share.

Earnings per share in this case refers to the last twelve months’ earnings. The P/E ratio derived this way is also known as trailing P/E.

If we use next year’s estimated earnings instead, we will be calculating the projected or forward P/E.

Interpreting the P/E Ratio

One simple way to understand P/E is that it gives the number of years the company will need to generate enough value to cover the cost the stock at the current market price (assuming no growth in earnings).

Like any business, the value of a stock is directly related to the company’s ability to generate cash. Thus, in a sense, a lower price-earnings ratio often suggests value.

The P/E ratio also reflects the market’s expectation regarding the future performance of the stock. Higher price-earnings ratio indicates higher expectations for the company.

Using the P/E ratio, we can compare the relative earning power of the companies regardless of their size or stock price.

On the surface, a $50 stock may seem more expensive than a $20 stock but if the $50 stock earns $5 a share while the $20 stock earns only $1, using the P/E ratio, you will be able to see that the $20 stock is twice as expensive as the $50 stock.

What is a good P/E ratio?

There maybe no such thing as a good price-to-earnings ratio. When P/E is high, one can either say its too expensive or argue that growth prospects are good. On the other hand, when P/E is low, one can say that it is a value play or that the company’s future is not too bright.

Moreover, even the average P/E varies across companies in different industries.

Conclusion

The P/E ratio is just one of the many financial ratios that are used to evaluate stocks. As it is an often quoted metric, it seems like an all important ratio to many investors but in reality, it is definitely inadequate to base your investing decision on just this metric alone.

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PE Ratio Investing – Finding Value Stock Market Investments

3 Overbought Picks to Sell, Value 3 Stocks to Buy

OK class, investing 101 is in session. What is a PE ratio – or P/E ratio as it is sometimes referred to? If you said “price to earnings ratio,” you get partial credit. But more important to your investing strategy is exactly what that investing catch phrase means and what a PE ratio calculates for stocks.

In simplest terms, a PE ratio is a valuation of a company’s current stock price compared with its full-year earnings per share. This allows investors to compare companies of different sizes and in different sectors along the same investment playing field. While PE ratios for stocks indeed have an industry norm — for instance, many biotech startups have high PE ratios because they have not yet won approval for a drug and are therefore not making much money yet – this measure is helpful as a rule of thumb to tell you how “expensive” or “cheap” a stock is.

Take Apple Inc. (AAPL). The company’s current market value per share is around $265. For the full fiscal year of 2020, Apple is expected to earn about $13.50 a share. 265 divided by 13.5 gives you around 19.6 – the current PE ratio for Apple.

There are variations on price to earnings ratios, of course. Some investors use trailing earnings because these are actual profits per share instead of Wall Street estimates. Others use future EPS since investors should be buying the stock based on the outlook going forward instead of past and current performance. Still another variation is to annualize earnings per share based on a single quarter instead of taking each quarter’s earnings independently.

Now that we have the basics down, what is a good PE ratio for a stock? Strictly speaking, anything between 15 to 25 is a decent valuation. When companies have PE numbers in the single-digits, they tend to be seen as good buys by investors who watch this ratio. When a stock gets around 30 or 35, generally investors who watch PE ratios think the company is overpriced.

The rule isn’t foolproof, but it is helpful when plotting an investment strategy or a simple trading strategy for your retirement money.

To give you some concrete examples, here are three overvalued stocks according to these PE ratio guidelines, and three bargain investments to buy based on their current price to earnings makeup:

High PE Ratios – Three Overbought Stocks (VMC, HOT, WYNN)

Vulcan Materials (VMC) has a PE ratio of around 170 right now after two straight quarterly losses – included a shortfall of -35 cents per share in the first quarter. Vulcan sells “aggregates” to the construction industry including crushed stone, sand, gravel and concrete, and the lack of building recently thanks to a harsh housing market has really hurt VMC. The full-year earnings estimate for Vulcan is a mere 28 cents per share. Divide the current stock price of around $48 by that figure, and you get a fairly ludicrous PE ratio.

Starwood Hotels & Resorts (HOT) also has very high PE ratio, but not as bad as VMC. With shares of HOT stock around $50 and full-year earnings expected to come in at 94 cents, that gives this stock a PE ratio of more than 50 – double that of what most investors consider a good valuation. The interesting thing is that unlike Vulcan, Starwood Hotels appears to be a victim of its own success and overenthusiastic buying that has gotten ahead of proper stock pricing. Thanks to a 550% earnings surprise for the first quarter and improving numbers, the stock has raced up about +35% year-to-date. Those who watch PE ratios may say that HOT stock is overbought due to this high valuation right now.

Wynn Resorts (WYNN) seems to be in the same boat as Starwood, with a PE ratio of round 80. Shares of WYNN stock are trading for around $86, and the full-year earnings estimate for this stock is around $1.10. Investors have bid up WYNN on the prospect of a recovery, as well as big expansions in the Chinese gambling mecca of Macau. But for those who pay attention to PE ratios, WYNN stock may be overvalued after a gain of nearly +50% since January 1.

Low PE Ratios – Three Bargain Stocks (GME, F, DELL)

GameStop (GME) is a video game retailer that many investors have turned away from as game sales have slumped and consumer spending remains thin. But GameStop continues to put up great numbers and is trading at a bargain PE ratio of under 8 right now. At less than $20 a share and with projected earnings of $2.60 for the year, GME could be a good bargain stock to buy for investors watching price to earnings ratios. What’s more, GameStop has met or exceeded Wall Street expectations in the last three quarters so it’s not unrealistic to think that full-year earnings could be even better than forecasts for GME stock.

Ford Motor Co. (F) seems to be losing favor with investors despite its breakout performance in 2009. Folks are afraid that the year-over-year comparisons for the automaker will only get harder and that the lion’s share of the gains in market share made after the bankruptcy of GM and Chrysler have already been baked into shares. However, with a full-year profit forecast around $1.30 a share and current pricing of around $11.60, Ford puts up a PE ratio of less than 9. That could mean Ford is a great bargain buy for investors.

Dell (DELL), the computer manufacturer that was trading for $40 a share in 2005 and hasn’t topped $25 a share except for a brief uptick in 2008, is far from the dominator it was five years ago. However, with full-year earnings projected at about $1.30 a share and DELL stock currently trading under $14, the PE of about 10 could mean that Dell is at last a good buy again for investors who watch price to earnings ratios.

One word of caution: Since earnings estimates are fluid and share prices are even more so, it is important to always make sure you have the latest information before making a trade based on price to earnings ratios. What’s more, remember that earnings estimates are exactly that – estimates. If a stock is trading at a bargain PE ratio based on a lofty earnings outlook but then falls dramatically short, it turns out the company was probably properly valued all along.

That said, PE ratios can be invaluable to determining whether a stock is overbought or whether it might just be oversold. Investors would be wise to add price to earnings data to their checklist when formulating an investing strategy.

As of this writing, Jeff Reeves owned a long position in GameStop.

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