Definition
Dilution occurs when new shares, options, restricted units, convertibles, or acquisition consideration increase the claims on a company's value. Total company value may grow while value per existing share grows more slowly or declines.
How to measure it
Track diluted weighted-average shares, period-end shares, equity compensation, option assumptions, and convertibles over time. Compare per-share growth with aggregate growth. Repurchases offset dilution only when they retire more ownership than compensation and issuance create.
Common trap
Stock-based compensation is often excluded from adjusted profit while its dilution remains economically real. Also inspect the price paid for repurchases: buying expensive shares to offset compensation can consume substantial owner cash without creating value.
When company growth and per-share growth diverge
If net income grows 10% from $10 million to $11 million while diluted shares rise from 10 million to 10.5 million, EPS grows from $1.00 to about $1.05—only 4.8%. The company improved, but the economics represented by each existing share grew at less than half the headline rate.
Repurchases do not automatically solve dilution. If a company buys six million shares at a high price while issuing five million through employee awards, net reduction is only one million. Compare opening and closing diluted shares and the actual issuance with the cash spent, not the buyback announcement.
Options and convertibles may not fully appear in basic shares today. Read diluted EPS, stock-compensation, conversion, and acquisition footnotes, then model the expected share count over the same horizon as the operating forecast.
- Compare revenue and profit growth with their per-share equivalents.
- Separate basic, weighted-average diluted, and period-end shares.
- Judge repurchases by net share change and average purchase price.
- Include unvested awards, options, and convertibles in dilution scenarios.
