Direct Answer
Direct answer: Earnings per share (EPS) is net income minus preferred dividends divided by weighted-average common shares outstanding, and it measures how much profit is attributable to each share. Diluted EPS extends the same idea to account for stock options, convertible bonds and other securities that could add shares, so it's normally equal to or lower than basic EPS.
Key Takeaways
- GAAP EPS follows standardized accounting rules, while adjusted EPS excludes items management labels non-recurring, but a recurring "one-time" cost every year likely reflects a real cost of the business.
- EPS growth can come from revenue growth, margin expansion, lower taxes, or share buybacks, so decomposing the source matters more than the headline growth number.
- Dilution works against EPS growth, net income up 15% with diluted shares up 12% can produce EPS growth of only around 3%.
- Red flags include EPS growth without matching revenue growth, persistent dilution, and buyback-driven growth masking weak operating cash flow.
Basic EPS Formula
Basic EPS = (net income − preferred dividends) ÷ weighted-average common shares outstanding. Net income $900M, preferred dividends $30M, weighted-average shares 300M: ($900M − $30M) ÷ 300M = $2.90 basic EPS. Weighted-average shares are used (rather than the ending share count) because the share count can change throughout the period via buybacks, issuance, or option exercises.
Basic EPS vs. Diluted EPS
Diluted EPS estimates earnings per share if potentially dilutive securities, stock options, RSUs, convertible bonds, convertible preferred, warrants, became common shares. It's normally equal to or lower than basic EPS. Example: net income available to common $400M, basic shares 100M, potential dilutive shares 10M. Basic EPS = $400M ÷ 100M = $4.00. Diluted EPS = $400M ÷ 110M ≈ $3.64, about 9% lower. Securities that would increase EPS or reduce a loss are excluded as "anti-dilutive" for that period.
GAAP EPS vs. Adjusted EPS
GAAP EPS follows standardized accounting rules and includes restructuring costs, stock-based compensation, impairments, and one-time gains or losses. Adjusted EPS excludes items management considers non-recurring. Adjusted figures can reveal underlying trends, but an expense shouldn't be ignored just because it's labeled "one-time", if a company excludes similar restructuring or stock-based compensation costs every single year, those costs likely represent a genuine cost of running the business. Reconcile adjusted EPS against GAAP EPS and cash flow before trusting it.
Where EPS Growth Comes From
EPS growth = (current EPS − previous EPS) ÷ |previous EPS| × 100. $2.50 to $3.00 = 20% growth. But the source of that growth matters. EPS can rise from revenue growth, margin expansion, cost reductions, lower interest expense, lower taxes, share repurchases, or one-time gains, decompose it. Example: revenue growth 6%, net-income growth 8%, EPS growth 14%, share count down 5%. Part of the EPS increase came from the business, part came from buybacks.
Dilution works in the opposite direction: net income up 15% with diluted shares up 12% might produce EPS growth of only ~3%. Existing shareholders own a smaller slice of the company after dilution, even while headline profit is rising.
Buybacks, Stock-Based Compensation, and EPS Quality
Repurchases can lift EPS, but the economic value depends on the price paid, buying undervalued shares benefits continuing shareholders, buying overvalued shares can destroy value even as EPS rises. Stock-based compensation is a noncash expense on the income statement, but it creates real dilution: companies often repurchase shares mainly to offset employee stock issuance, meaning the company can spend heavily on buybacks while the diluted share count barely moves.
EPS Analysis Checklist
Review basic EPS, diluted EPS, GAAP EPS, adjusted EPS, year-over-year and multi-year EPS growth, revenue growth, margin trends, share-count changes, stock-based compensation, repurchases, one-time items, and estimate revisions. Red flags: EPS growth without revenue growth, persistent dilution, large GAAP-to-adjusted gaps, and buyback-driven growth masking weak operating cash flow.
Frequently Asked Questions
What is a good EPS?
There is no universal good EPS because share prices, share counts, company size, and industries differ. EPS growth and quality are usually more informative than the absolute number.
Is diluted EPS more important than basic EPS?
Diluted EPS is often more conservative because it accounts for potential additional shares.
Can EPS be negative?
Yes. Negative EPS indicates a net loss attributable to each share.
Why can EPS rise when revenue is flat?
EPS may rise through margin improvement, cost reduction, lower taxes, reduced interest expense, or share repurchases.
Does a stock split change EPS?
A stock split reduces EPS proportionally because the number of shares increases, but it does not change the company's total value.
Why does the weighted-average share count matter more than the period-end count?
Earnings accrue across the whole period while share counts change during it, so dividing full-period profit by an end-of-period count mismatches the numerator and denominator. A large repurchase in the final week would then appear to lift earnings per share for months of profit it had no part in. The weighted average reflects how many shares were outstanding while the earnings were being generated.
How are convertible securities treated in the diluted calculation?
The standard approach tests whether conversion would reduce earnings per share, and includes the additional shares only when it does. For convertible debt this also means adding back the after-tax interest that would no longer be paid, since conversion removes the obligation. Instruments that would increase earnings per share are excluded as antidilutive. This is why diluted figures can move without any change in the securities outstanding.
What does a large gap between reported and adjusted earnings per share indicate?
It indicates that a significant amount is being excluded, and the question is what. Excluded items concentrated in stock-based compensation describe a real cost paid in shares rather than cash. Items that are described as one-off but appear every year describe a recurring cost being presented as exceptional. The reconciliation lists the excluded amounts by category, which turns a judgement about the gap into a reading exercise.
How should earnings per share be read for a company that recently issued a lot of stock?
The denominator has risen, so per-share figures fall even when total profit is unchanged, and a year-over-year comparison mixes that change with operating performance. Looking at total net income alongside the per-share figure separates the two. Where the issuance funded an acquisition, the acquired earnings arrive at a different point than the shares did, which distorts the comparison until a full period has passed.