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Monthly cost of a near-the-money call, as a percent of share price

Answered against 22 years of US equities and 12 years of US options data and published with the query that produced it. This result is stored as of 2026-08-22, from Covered Call Closed-End Funds vs ETFs.

as of series 18×3read in context →
Monthly cost of a near-the-money call, as a percent of share price — 18 rows by 3 columns, computed from US exchange, SIP and OPRA data.
monthspy_call_premium_pctaapl_call_premium_pct
2025-021.82.94
2025-032.363.62
2025-043.355.5
2025-052.283.68
2025-061.983.39
2025-071.923.66
2025-081.712.96
2025-091.613.03
2025-1023.31
2025-112.092.99
2025-121.632.69
2026-011.793.34
2026-022.053.29
2026-032.543.64
2026-042.053.42
2026-051.952.92
2026-061.943.18
2026-071.883.74
Rows × columns
18 × 3
Period covered
to
Computed
Completeness
No missing values
Source
US exchange, SIP and OPRA market data
Licence
Strasmore terms · free, no signup
Formats
JSON · CSV · the SQL below

What each column holds

Column definitions for Monthly cost of a near-the-money call, as a percent of share price, derived from the stored result.
ColumnTypeRangeNotes
month date 2025-02 to 2026-07
spy_call_premium_pct number 1.61 to 3.35 percent
aapl_call_premium_pct number 2.69 to 5.5 percent

Computed from Strasmore's warehouse of US exchange, SIP and OPRA market data. Equity prices are delayed; options greeks and implied volatility are end-of-day. This result is stored, not recomputed on load — it is exactly the numbers that were returned on , and the query below is what returned them.

the exact SQL behind every number 
SELECT
    formatDateTime(toStartOfMonth(date), '%Y-%m')                       AS month,
    round(avgIf(toFloat64(option_close) / toFloat64(underlying_close),
                underlying_symbol = 'SPY') * 100, 2)                    AS spy_call_premium_pct,
    round(avgIf(toFloat64(option_close) / toFloat64(underlying_close),
                underlying_symbol = 'AAPL') * 100, 2)                   AS aapl_call_premium_pct
FROM global_markets.options_greeks
WHERE underlying_symbol IN ('SPY', 'AAPL')
  AND lower(option_type) IN ('call', 'c')
  AND iv_converged = 1
  AND volume > 0
  AND underlying_close > 0
  AND days_to_expiry BETWEEN 20 AND 45
  AND abs(toFloat64(strike_price) / toFloat64(underlying_close) - 1) < 0.02
  AND date >= toStartOfMonth(today() - 550)
  AND date <  toStartOfMonth(today())
GROUP BY month
HAVING countIf(underlying_symbol = 'SPY') > 0
   AND countIf(underlying_symbol = 'AAPL') > 0
ORDER BY month

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