Earnings Per Share
Earnings per share (EPS) represents a company's net profit allocated to each outstanding share of common stock, and serves as the primary building block for most equity valuation metrics.
Earnings per share is arguably the single most important bottom-line metric for evaluating a publicly traded company. It translates total net income into a per-share figure, allowing investors to compare profitability across companies of vastly different sizes and share counts. If a company earns $10 billion in net income and has 5 billion diluted shares outstanding, its EPS is $2.00.
There are two key variants. Basic EPS uses only the weighted-average number of common shares outstanding during the period. Diluted EPS goes further, factoring in the potential conversion of stock options, warrants, convertible bonds, and other dilutive securities. Because diluted EPS represents the worst-case scenario for shareholders, it is the figure most analysts and media outlets reference.
Apple is a masterclass in using share buybacks to grow EPS even when net income is relatively flat. Between 2013 and 2024 Apple repurchased over $600 billion of its own stock, dramatically reducing the denominator in the EPS equation. This mechanical boost to EPS is entirely legitimate, but savvy investors also track total net income to ensure the underlying business is genuinely growing.
EPS comparisons must account for adjustments. Companies often report 'adjusted' or 'non-GAAP' EPS that excludes stock-based compensation, restructuring charges, or acquisition-related amortization. Microsoft, for instance, regularly reports a GAAP EPS alongside a non-GAAP EPS that strips out stock compensation; the gap between the two can be substantial in tech companies where equity grants are a major part of employee pay.
Year-over-year EPS growth is a critical signal. The market's reaction to an earnings announcement often hinges not just on whether EPS beat analyst estimates, but by how much and whether guidance for the next quarter was raised or lowered. A company that grows EPS at 15% annually will double its per-share earnings in about five years, which, assuming a stable P/E multiple, implies a doubling in share price as well.