When learning about stock market analysis, one of the first concepts investors encounter is earnings per share. Understanding what is eps is important because EPS connects a company's profit to each outstanding share of its stock. Trailing EPS takes this idea a step further by focusing on the company's earnings from a specific period that has already occurred, usually the most recent four quarters.
Trailing EPS is commonly used to evaluate a company's profitability and compare its earnings with its current share price. It can also help investors calculate the price-to-earnings ratio, one of the most widely followed valuation measures in the stock market.
This guide explains trailing EPS in simple terms, how it is calculated, why investors use it, its advantages and limitations, and how it differs from other forms of EPS.
What Is Trailing EPS?
Trailing EPS is the earnings per share a company generated based on its actual earnings during the most recent four completed quarters.
The word "trailing" means that the calculation looks backward. Instead of estimating what a company might earn in the future, trailing EPS uses financial results that have already been reported.
For example, suppose a company reported the following quarterly earnings:
- First quarter: $20 million
- Second quarter: $24 million
- Third quarter: $26 million
- Fourth quarter: $30 million
If the company had 10 million shares outstanding, its approximate trailing EPS would be:
($20 million + $24 million + $26 million + $30 million) ÷ 10 million shares = $10
Therefore, the company's trailing EPS would be $10.
The calculation can become more complicated when a company has preferred dividends, share buybacks, stock splits, or changes in the number of shares outstanding. Financial websites may therefore show slightly different figures depending on the method and reporting period used.
What Is EPS and Why Does It Matter?
Before understanding trailing EPS, it helps to understand what is eps in general.
EPS stands for Earnings Per Share. It measures how much of a company's profit is attributable to each share of common stock.
The basic formula is:
EPS = Net Income Available to Common Shareholders ÷ Weighted Average Common Shares Outstanding
For example, if a company earns $50 million after applicable expenses and has 10 million weighted-average common shares, its EPS is $5.
EPS does not mean that shareholders receive $5 in cash. It is an accounting measure of profitability per share.
A company may use its earnings to expand operations, repay debt, purchase other businesses, build cash reserves, or pay dividends. Therefore, EPS should not be confused with the dividend paid to investors.
How Is Trailing EPS Calculated?
Trailing EPS generally uses the company's earnings from the most recent four quarters.
A simplified calculation is:
Trailing EPS = Earnings From the Last Four Quarters ÷ Applicable Weighted Average Shares
However, professional financial statements can involve additional adjustments.
Net Income
The first important component is net income. This represents the company's profit after expenses, interest, taxes, and other applicable costs.
However, investors generally focus on income available to common shareholders rather than simply taking total net income.
Preferred Dividends
If a company has preferred stock, preferred shareholders may have a claim on certain earnings before common shareholders.
As a result, preferred dividends may be subtracted when calculating basic EPS.
Weighted Average Shares
The number of shares a company has can change during the year.
A business might issue new shares, repurchase existing shares, or complete another transaction that changes its share count.
EPS calculations therefore commonly use weighted average shares rather than simply using the number of shares outstanding on the final day of the year.
Trailing EPS vs. Basic EPS
Trailing EPS and basic EPS are related, but they are not exactly the same concept.
Basic EPS describes the calculation method that generally uses actual common shares outstanding without assuming conversion of potentially dilutive securities.
Trailing EPS describes the time period being examined.
This means a company can have trailing basic EPS based on the last four quarters.
The distinction is useful because "trailing" tells you when the earnings occurred, while "basic" tells you something about how shares were treated in the calculation.
Trailing EPS vs. Diluted EPS
Diluted EPS considers securities that could potentially increase the number of common shares.
These may include stock options, convertible securities, or other instruments that could result in additional shares.
Because the denominator can be larger, diluted EPS is often lower than basic EPS when potentially dilutive securities exist.
For example, imagine a company has $100 million in earnings and 20 million basic shares.
Its basic EPS would be:
$100 million ÷ 20 million = $5
If potential conversions increase the effective share count to 22 million, diluted EPS would be:
$100 million ÷ 22 million = $4.55
When reviewing a stock, investors should understand whether the displayed EPS figure is basic or diluted.
Why Do Investors Use Trailing EPS?
Trailing EPS provides investors with a historical measure of profitability.
One of its biggest advantages is that it is based on reported financial results rather than forecasts.
This can make it useful when examining how a company has actually performed.
Measuring Profitability
Trailing EPS gives investors a way to examine whether a business is producing meaningful earnings relative to its share count.
A company with growing EPS may be increasing profits, reducing its share count, or benefiting from both factors.
However, rising EPS does not automatically mean that the company's underlying business is becoming stronger. Investors should examine the reasons behind the change.
Comparing Different Periods
Trailing EPS can be compared with earlier periods.
Suppose a company had trailing EPS of $2.50 last year and $3.25 this year.
The increase suggests that earnings per share have improved.
Investors can then investigate whether the improvement came from higher revenue, better margins, lower expenses, share buybacks, or other factors.
Calculating the P/E Ratio
Trailing EPS is particularly important when calculating the price-to-earnings ratio.
The basic formula is:
P/E Ratio = Current Share Price ÷ Trailing EPS
Suppose a stock trades at $60 and its trailing EPS is $5.
The P/E ratio would be:
$60 ÷ $5 = 12
This means investors are currently paying $12 for every $1 of the company's trailing earnings per share.
The P/E ratio should not be interpreted by itself. Different industries can have very different typical valuation levels.
What Does a Rising Trailing EPS Mean?
A rising trailing EPS can indicate that earnings attributable to each common share have increased.
For example, a company's trailing EPS might move from $3 to $3.50 and then to $4.
Several factors could explain this pattern.
The company might be selling more products. It could be improving its profit margins. It might be reducing operating costs. It could also be buying back shares.
Share buybacks are especially important to understand.
The Effect of Share Buybacks
Imagine a company earns $100 million.
If it has 25 million shares, simplified EPS is $4.
If the company later buys back shares and the relevant share count falls to 20 million while earnings remain $100 million, simplified EPS becomes $5.
The company's total profit did not increase, but earnings per share did.
This is why investors should look beyond EPS and examine revenue, net income, cash flow, debt, and share-count changes.
What Does a Falling Trailing EPS Mean?
A declining trailing EPS means earnings per share have decreased compared with an earlier period.
This could happen because profits declined or because the company issued additional shares.
For example, a company might experience higher production costs, weaker sales, increased interest expenses, or other challenges that reduce net income.
However, one quarter of weaker earnings does not necessarily establish a long-term trend.
Investors should examine multiple reporting periods and understand the reason for the change.
Trailing EPS and Stock Valuation
Trailing EPS is often used to assess whether a stock's current price is high or low relative to its historical earnings.
For example, consider two companies:
Company A
Share price: $50
Trailing EPS: $5
P/E: 10
Company B
Share price: $50
Trailing EPS: $2.50
P/E: 20
Both stocks have the same share price, but their earnings and P/E ratios are different.
However, the lower P/E does not automatically mean Company A is a better investment.
Company B might have faster growth, stronger future prospects, lower debt, or a different business model.
Valuation requires context.
Limitations of Trailing EPS
Trailing EPS is useful, but it has important limitations.
It Looks Backward
The biggest limitation is that trailing EPS is historical.
A company may have performed extremely well during the last four quarters but face significant changes in the future.
Conversely, a company may have weak historical earnings while recently improving its business.
Therefore, investors often consider both historical results and future expectations.
One-Time Events Can Distort EPS
A company's earnings may be affected by unusual events.
For example, a business might sell an asset and record a large gain. This can increase reported net income for a particular period.
Similarly, restructuring costs or other unusual expenses can reduce earnings.
When this happens, trailing EPS may not perfectly represent normal operating performance.
Negative EPS Creates Challenges
Some companies report losses rather than profits.
In such cases, EPS can be negative.
A traditional P/E ratio generally becomes less meaningful when earnings are negative because dividing the share price by negative earnings does not provide the same valuation interpretation as a positive P/E.
Investors may then examine other measures, such as revenue growth, operating cash flow, free cash flow, or enterprise-value-based metrics, depending on the company.
Trailing EPS vs. Forward EPS
Trailing EPS looks at historical earnings.
Forward EPS is based on estimates of future earnings.
This creates an important difference.
Trailing EPS answers a question similar to:
How much did the company earn per share based on its recent reported results?
Forward EPS asks:
How much might the company earn per share in the future based on available estimates?
Neither measure should automatically be treated as superior.
Trailing EPS provides actual historical information, while forward EPS can provide insight into expectations about future profitability.
However, forward EPS depends on estimates, and estimates can change.
How to Use Trailing EPS Properly
Trailing EPS is most useful when combined with other financial information.
Start by examining whether EPS has been growing or declining over several years.
Then look at revenue growth. If EPS is rising while revenue is flat, investigate why.
Next, examine profit margins and operating expenses.
Debt is also important because high interest costs can affect future earnings.
Cash flow provides another useful perspective. Accounting earnings and actual cash generation can sometimes differ substantially.
Finally, consider valuation. A stock's share price should be viewed in relation to earnings, growth expectations, business quality, industry conditions, and other relevant financial factors.
Common Mistakes When Reading Trailing EPS
One common mistake is assuming that a higher EPS automatically means a better company.
EPS must be viewed in context.
Another mistake is comparing companies from completely different industries without considering their different business models.
Investors also sometimes confuse EPS with dividends. A company can have high EPS but pay a relatively small dividend because it reinvests profits into its business.
Another mistake is ignoring the share count. EPS can rise because of genuine profit growth or because fewer shares are outstanding.
Understanding the underlying numbers helps prevent misleading conclusions.
Frequently Asked Questions
Is trailing EPS based on the last 12 months?
Generally, yes. Trailing EPS commonly refers to earnings per share calculated using the company's most recent four completed quarters, often described as the trailing twelve months or TTM.
Is trailing EPS the same as annual EPS?
They can be similar when the most recent four quarters correspond closely to the company's fiscal year. However, trailing EPS is specifically focused on the latest completed four-quarter period, which may differ from a company's reported fiscal-year period.
Why does trailing EPS change?
Trailing EPS changes as new quarterly results are reported and older quarters drop out of the trailing period. Changes in net income and the weighted average share count can also affect it.
Can EPS be negative?
Yes. If a company reports a loss attributable to common shareholders, its EPS can be negative.
Is higher EPS always better?
Not necessarily. Higher EPS can result from stronger profits, share buybacks, accounting factors, or other changes. Investors should examine the reason behind the EPS figure and consider the broader financial condition of the company.
Conclusion
Understanding what is eps provides a strong foundation for learning how investors evaluate company profitability. Trailing EPS builds on this concept by focusing on earnings per share generated during the most recent four completed quarters.
Because trailing EPS is based on historical financial results, it offers a useful view of what a company has actually earned rather than what analysts expect it to earn. It can help investors track profitability, compare financial periods, and calculate valuation measures such as the P/E ratio.
At the same time, trailing EPS should never be viewed in isolation. Changes in revenue, profit margins, debt, cash flow, share count, and one-time events can all influence the number. A rising EPS figure may reflect genuine business growth, but it can also be influenced by share repurchases or other factors.
The most useful approach is to treat trailing EPS as one part of a broader financial analysis. By understanding how it is calculated, what it represents, and where its limitations lie, investors can interpret company earnings information more accurately and make better-informed decisions based on the complete financial picture.