Reg T minimum branches for one uncovered AAPL put, by strike (dollars per share)
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 2026-09-20, from Margin for Selling Naked Options: Reg T Math.
| strike | main_branch | floor_branch | branch_gap |
|---|---|---|---|
| 240 | 8.79 | 24 | -15.21 |
| 245 | 13.79 | 24.5 | -10.71 |
| 250 | 18.79 | 25 | -6.21 |
| 255 | 23.79 | 25.5 | -1.71 |
| 260 | 28.79 | 26 | 2.79 |
| 265 | 33.79 | 26.5 | 7.29 |
| 270 | 38.79 | 27 | 11.79 |
| 275 | 43.79 | 27.5 | 16.29 |
| 280 | 48.79 | 28 | 20.79 |
| 285 | 53.79 | 28.5 | 25.29 |
| 290 | 57.8 | 29 | 28.8 |
- Rows × columns
- 11 × 4
- 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 |
|---|---|---|---|
strike |
number | 240 to 290 | US dollars |
main_branch |
number | 8.79 to 57.8 | |
floor_branch |
number | 24 to 29 | |
branch_gap |
number | -15.21 to 28.8 |
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
round(toFloat64(strike_price), 2) AS strike,
round(0.20 * max(toFloat64(underlying_close))
- greatest(max(toFloat64(underlying_close)) - toFloat64(strike_price), 0.0), 2) AS main_branch,
round(0.10 * toFloat64(strike_price), 2) AS floor_branch,
round(0.20 * max(toFloat64(underlying_close))
- greatest(max(toFloat64(underlying_close)) - toFloat64(strike_price), 0.0)
- 0.10 * toFloat64(strike_price), 2) AS branch_gap
FROM global_markets.options_greeks
WHERE underlying_symbol = 'AAPL'
AND date = (
SELECT max(date)
FROM global_markets.options_greeks
WHERE underlying_symbol = 'AAPL'
AND date BETWEEN '2026-06-01' AND '2026-06-30'
)
AND days_to_expiry BETWEEN 20 AND 45
AND iv_converged = 1
AND volume > 0
AND toFloat64(strike_price) BETWEEN 0.82 * toFloat64(underlying_close)
AND 1.02 * toFloat64(underlying_close)
GROUP BY strike_price
ORDER BY strike