Earnings Per Share (EPS)

Earnings per share is the portion of a company's profit assigned to each outstanding share of its common stock. The Securities and Exchange Commission describes it, in defining the price-to-earnings ratio, as "the earnings for the past 12 months" divided by the number of common shares outstanding. More precisely, the numerator is net income reduced by any dividends owed to preferred shareholders, since those are not available to common shareholders, and the denominator is the number of common shares. The result is a per-share profit figure that makes companies of different sizes comparable on a like-for-like basis.

Earnings per share matters most as the bridge between a company's profits and its stock price. The price-to-earnings ratio, the most common valuation shorthand, is just the share price divided by earnings per share, so EPS is the profit half of that comparison. On its own, EPS says how much profit each share earned; paired with the price, it says how much a buyer is paying for each dollar of that profit.

The most important distinction is basic versus diluted. Basic earnings per share divides by the shares actually outstanding. Diluted earnings per share divides by a larger count that also includes shares that could come into existence if outstanding stock options, warrants, and convertible securities were exercised or converted. Because those potential shares would spread the same profit over a larger base, diluted EPS is lower than basic EPS, and it is the more conservative and generally more meaningful figure for a company that has issued many options or convertibles. Public companies report both, and a reader comparing two companies should compare like with like.

A second distinction is trailing versus forward. Trailing EPS uses the earnings a company has already reported over the past twelve months, a matter of record. Forward EPS uses an analyst estimate of the coming year, which is more relevant to a forward-looking investor and also just a forecast that may prove wrong. The same company therefore carries more than one EPS figure at a time, and a valuation ratio built on one is not comparable to a ratio built on the other.

Two mechanical points are worth keeping in view. First, the denominator moves. A company that buys back its own shares reduces the share count, so earnings per share rise even if total profit is flat; a company that issues new shares dilutes the count and lowers EPS. A rising EPS is therefore not always evidence of a more profitable business, and a reader should ask whether it came from higher profit or a smaller share base. Second, the numerator is an accounting figure, subject to judgment about timing and to one-time items such as a gain on a sale or a large write-down, so a single period's EPS can be distorted by events that will not repeat. This is why analysts often look at EPS trends over several years and at figures that strip out unusual items, rather than at a single quarter's number.

Start with the numerator. Suppose a company earns net income of $500 million in a year and owes $20 million in preferred dividends. The profit available to common shareholders is $500 million − $20 million = $480 million.

Now the denominator. If the company has 100 million common shares outstanding, basic earnings per share is $480 million ÷ 100 million = $4.80 per share. If outstanding options and convertible securities could add 10 million more shares, diluted earnings per share is $480 million ÷ 110 million ≈ $4.36 per share, lower because the same profit is spread across more shares.

Finally, connect it to price. If the stock trades at $96.00, the price-to-earnings ratio using basic EPS is $96.00 ÷ $4.80 = 20: the buyer is paying twenty dollars for each dollar of annual per-share profit. Notice too that if this company bought back 10 million shares and profit held at $480 million, basic EPS would rise to about $5.33 ($480 million ÷ 90 million), lifting the reported figure without the business earning a cent more. All figures are illustrative.

Pros

• It standardizes profit to a per-share basis, making companies of different sizes comparable.
• It is the profit input to the widely used price-to-earnings ratio.
• Diluted EPS gives a conservative, options-aware view of per-share profitability.

Cons

• Share count sits in the denominator, so buybacks and issuance move EPS without any change in the underlying business.
• The numerator is an accounting figure that one-time gains or write-downs can distort for a period.
• It says nothing about how much capital was needed to earn the profit, so it cannot be compared across companies without other measures.
• Basic and forward figures can flatter a company relative to its diluted or trailing numbers, so the versions must be matched when comparing.