A five cent concession as a share of premium, near-the-money SPY contracts by expiry
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 2026-10-08, from How Much Slippage to Assume in a Backtest.
| dte_bucket | avg_premium_usd | nickel_pct_of_premium |
|---|---|---|
| 0 to 2 days | 5.17 | 8.21 |
| 3 to 7 days | 6.15 | 3.43 |
| 8 to 21 days | 7.89 | 1.23 |
| 22 to 45 days | 13.29 | 0.45 |
| 46 days or more | 38.4 | 0.17 |
- Rows × columns
- 5 × 3
- Computed
- Completeness
- No missing values
- Source
- US exchange, SIP and OPRA market data
- Licence
- Strasmore terms · free, no signup
What each column holds
| Column | Type | Range | Notes |
|---|---|---|---|
dte_bucket |
text | 5 distinct values (0 to 2 days, 22 to 45 days, 3 to 7 days…) | |
avg_premium_usd |
number | 5.17 to 38.4 | US dollars |
nickel_pct_of_premium |
number | 0.17 to 8.21 | 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.
Run it yourself
This is the exact query behind the result above. Change a ticker, a date or a column and run it against the warehouse — no account, no key. The no-signup tier is smaller than the one this page was computed on; a query that reaches past it comes back saying which plan runs it.
SELECT
multiIf(days_to_expiry <= 2, '0 to 2 days',
days_to_expiry <= 7, '3 to 7 days',
days_to_expiry <= 21, '8 to 21 days',
days_to_expiry <= 45, '22 to 45 days',
'46 days or more') AS dte_bucket,
round(avg(toFloat64(option_close)), 2) AS avg_premium_usd,
round(avg(0.05 / toFloat64(option_close)) * 100, 2) AS nickel_pct_of_premium
FROM global_markets.options_greeks
WHERE underlying_symbol = 'SPY'
AND date = '2026-09-16'
AND iv_converged = 1
AND volume > 0
AND option_close > 0.05
AND abs(toFloat64(strike_price) / toFloat64(underlying_close) - 1) < 0.02
GROUP BY dte_bucket
ORDER BY min(days_to_expiry)
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