EPS — Diluted

Earnings per share is net income divided by the number of shares outstanding — how much of a company's profit belongs to each individual share. The diluted version, the figure that matters for most valuation work, divides net income by the weighted-average diluted share count: shares outstanding plus the additional shares that options, restricted stock units and convertible securities would add if exercised, always at least as large as the basic count.

Basic EPS uses the weighted-average number of shares actually outstanding during the period — simple, but it ignores every security that could turn into a share later. Diluted EPS accounts for that possibility using the treasury-stock method: assume every option and award is exercised, assume the company uses the cash proceeds to buy back shares at the current market price, and count only the net new shares that remain after that hypothetical buyback. The more a company has granted in options and restricted stock, and the higher its share price relative to the exercise prices, the wider the gap between basic and diluted EPS. Diluted EPS is always less than or equal to basic EPS by construction — dilution can only add shares to the denominator, never remove them — which is why it is the more conservative, and the more widely used, of the two figures.

Because EPS is a per-share figure, share count moves it just as surely as profit does. A company that buys back stock while net income holds flat reports rising EPS purely from a shrinking denominator — genuinely good for remaining owners when the shares are repurchased below intrinsic value, cosmetic when the buyback is funded by new debt purely to flatter the per-share number ahead of a bonus target. Reading EPS growth without checking whether it came from real profit growth or from a shrinking share count is a common and avoidable mistake. The same caution applies to one-off items: a large asset sale, a tax benefit, or a legal settlement can spike a single year's EPS without reflecting any change in the durable earning power of the business, which is why a multi-year run of EPS tells a more honest story than any single year.

Moatkeep computes trailing-twelve-month EPS as TTM net income divided by the trailing weighted-average diluted share count taken from each company's own filings — never by summing four separately reported quarterly EPS figures, because each quarter's share count differs and a simple sum silently double-counts or under-counts the dilution that occurred along the way. When no usable weighted-average share base is available, the figure falls back to the company's latest reported annual diluted EPS instead, and only when that reported figure is recent enough to reflect the company's current era — an old, stale EPS figure is never priced against today's numbers. Every figure carries the fiscal period it was computed from and is revised whenever a company restates its results.

Diluted EPS is the numerator, inverted, of the price-to-earnings ratio, and it underlies the earnings yield, the PEG ratio and the Graham number shown across covered companies — a single, consistently computed figure feeding several different lenses on the same underlying earning power. A loss-making company shows a negative EPS rather than a blank, so the ratios built on it can be shown honestly as not-meaningful instead of a misleading multiple. Banks and insurers lean on the EPS trend as heavily as any industrial company, since their earning power is measured the same way even though the balance sheet behind it looks nothing alike; a multi-year run of diluted EPS growth is one of the few yardsticks that reads consistently across otherwise very different business models.

For a value investor the figure is a starting point, not a verdict: a rising diluted EPS built on real, recurring operating profit and a stable or shrinking share count is the shape worth investigating further; the same rising number built on financial engineering — debt-funded buybacks, one-off gains, a falling tax rate — is the shape worth treating with real suspicion. The basic figure, quoted separately alongside diluted on most income statements, is worth a glance too: a wide and widening gap between the two is itself a signal of how much dilution shareholders are quietly absorbing year after year.