Why are executive stock options harder to value than traded options?

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AcadiFi · Accepted Answer

Executive stock options differ from exchange-traded options in ways that materially affect valuation:

1. NON-TRANSFERABILITY: Executives can't sell options to capture time value, so they often exercise early once in-the-money. This shortens the effective term.

2. SERVICE REQUIREMENT: Unvested options are forfeited on separation, truncating expected life.

3. DILUTION: Exercise increases shares outstanding, diluting existing holders — but issuers typically ignore this in valuation (dilution is already priced by the market).

4. LONG DURATION: Typically 10-year contractual term with 3–4 year vesting, well beyond the 1-year max for traded LEAPs.

5. NO DIVIDEND PROTECTION: Executives don't receive dividends on unexercised options, reducing value.

Adjustments applied: Nordstar Systems would compute the EXPECTED TERM rather than contractual term — often 5-7 years for 10-year options. Volatility is based on historical stock volatility (often 35-55% for mid-cap). Dividend yield reduces value. Risk-free rate matches expected term.

Worked example: Contractual 10-year option, strike $68, spot $68, vol 40%, rf 4.2%, div yield 1.5%. Plain Black-Scholes with T=10 gives ~$29. Using expected term T=6 with truncation adjustment gives ~$23 — a 21% reduction.

SEC guidance (SAB 107/110) lets companies use simplified expected term = (vesting + contractual)/2, so (4+10)/2 = 7 years for this grant, yielding ~$24.50.

Exam insight: understanding these adjustments explains why similar grants at different firms produce different reported expense.

Why are executive stock options harder to value than traded options?

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