What is Earnings Per Share? Definition, Formula, and Example
Earnings per share is a company's net income divided by its shares outstanding, expressing profitability on a per-share basis so it can be compared against the stock's price.
What is Earnings Per Share?
Earnings per share (EPS) is the portion of a company's net income allocated to each outstanding share of common stock. It is the single most quoted profitability metric in equity research because it converts a company-wide dollar figure — net income — into a per-share number that lines up directly against the stock price, making it the numerator (or denominator, depending on framing) of the P/E ratio and the anchor of every earnings-season headline. A company can grow EPS either by growing net income or by shrinking its share count through buybacks, which is why EPS and revenue growth frequently diverge.
How It's Calculated
Basic EPS = (Net income − Preferred dividends) / Weighted average shares outstanding
Preferred dividends are subtracted because that income belongs to preferred holders, not common shareholders. The weighted average share count accounts for shares issued or repurchased mid-period rather than using a single point-in-time count.
Diluted EPS = (Net income − Preferred dividends) / (Weighted average shares + dilutive securities)
Diluted EPS adds in the shares that would exist if all outstanding stock options, warrants, restricted stock units, and convertible debt were exercised or converted, using the treasury stock method for options and the if-converted method for convertibles. Diluted EPS is always equal to or lower than basic EPS and is the figure analysts and companies emphasize in guidance because it reflects the fully diluted claim on earnings.
Worked Example
Apple reported trailing-twelve-month diluted EPS of $8.27 as of its fiscal Q2 2026 print (quarter ended March 2026), on a diluted share count of roughly 14.9 billion — implying TTM net income of approximately $123.2 billion ($8.27 × 14.9B). With AAPL trading near a P/E of roughly 38x, that puts the stock price around $315: $8.27 EPS × 38.1 P/E ≈ $315. If Apple repurchases 3% of its shares over the next year without any change in net income, diluted share count falls to about 14.5 billion and EPS rises to roughly $8.50 — a pure buyback-driven EPS gain with zero underlying earnings growth, which is exactly the mechanism critics point to when they say EPS growth can be manufactured rather than earned.
When Traders Use It
EPS drives two of the most-watched events in a stock's calendar: quarterly earnings reports (where actual EPS is compared against analyst consensus estimates, and the "beat" or "miss" — even by a penny — routinely moves the stock several percent) and forward guidance (where management's own EPS forecast for future quarters resets analyst models). Traders also track EPS growth rate year-over-year as a filter for momentum and growth strategies, and use trailing and forward EPS as the denominator input for P/E-based relative valuation across a sector — comparing, for example, NVDA's forward P/E to AMD's to judge which is priced more richly relative to expected earnings.
Limitations and Common Misconceptions
EPS is an accounting figure, not a cash figure — it includes non-cash items like depreciation, amortization, and stock-based compensation, so two companies with identical EPS can have very different free cash flow profiles. It's also easy to manipulate upward through share buybacks, one-time gains, or aggressive accounting choices around revenue recognition and expense timing, which is why analysts frequently strip out one-time items to compute "adjusted" or "core" EPS — a non-GAAP figure companies define themselves, with no standardized methodology across firms. EPS also says nothing about the balance sheet: a company can post growing EPS while quietly taking on debt to fund the buybacks driving that growth. Finally, EPS in isolation is meaningless without the share price — it only becomes a valuation tool once paired into a ratio like P/E.