What's the treasury stock method?
For in-the-money options and warrants, assume exercise, then use the proceeds to repurchase shares at the current share price. The net new shares are added to basic shares; RSUs typically add shares directly, subject to tax/share-settlement assumptions.
Intuition
Dilution isn't the gross number of option shares issued—it's the economic shortfall after recognizing that exercise injects cash into the company. Existing shareholders are diluted only to the extent the value of stock issued exceeds the cash received, which is why only in-the-money options matter: the holder captures the intrinsic value, and that value transfer shows up as incremental shares.
Watch
Out-of-the-money options are excluded entirely—don't include them in the share count just because they exist. Also, RSUs are handled differently: they typically add shares directly, subject to tax/share-settlement assumptions.
Deep Dive
Explain how the treasury stock method converts in-the-money options and warrants into incremental diluted shares.
The treasury stock method answers: "If all in-the-money options/warrants were exercised today, how many NET new shares would be created?"
Core Logic: Option holders pay the exercise (strike) price to get shares. The company takes that cash and theoretically buys back shares at the current market price. The difference is the net dilution.
Steps:
-
Identify all options/warrants where $ \text{Strike Price} < \text{Current Share Price} $ (i.e., in-the-money). Out-of-the-money options are ignored.
-
Assume all in-the-money options are exercised → company issues new shares equal to the total number of options.
-
Calculate proceeds received by the company: $$ \text{Proceeds} = \text{Number of Options} \times \text{Strike Price} \
- Net new (incremental) shares: $$ \text{Incremental Shares} = \text{Shares Issued} - \text{Shares Repurchased} \
Example: 1,000 options at a $10 strike, current share price = $25, basic shares = 10,000
| Step | Calculation | Result |
|---|---|---|
| Shares issued | 1,000 | 1,000 |
| Proceeds | 1,000 × $10 | $10,000 |
| Shares bought back | $10,000 ÷ $25 | 400 |
| Incremental shares | 1,000 − 400 | 600 |
| Diluted shares | 10,000 + 600 | 10,600 |
Key nuance: The wider the gap between strike and market price, the greater the dilution. If strike = market price, incremental shares = 0. If strike > market price, options are out-of-the-money and excluded.
Where it shows up: Diluted EPS on the income statement, and equity value → equity value per share in valuation (enterprise value bridge uses diluted shares via TSM).
Shortcut: Net new shares = $ \text{Options} \times \frac{\text{Market Price} - \text{Strike Price}}{\text{Market Price}} $. Algebraically identical, skips the proceeds step.