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.