maintenance_margin_schedule
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 2026-09-11, from how-long-can-you-hold-a-short-position.
| share_price | maintenance_per_share_usd | pct_of_market_value |
|---|---|---|
| $2 | 2.5 | 125 |
| $4 | 4 | 100 |
| $5 | 5 | 100 |
| $10 | 5 | 50 |
| $15 | 5 | 33.3 |
| $20 | 6 | 30 |
| $30 | 9 | 30 |
| $50 | 15 | 30 |
| $100 | 30 | 30 |
- Rows × columns
- 9 × 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 |
|---|---|---|---|
share_price |
text | 9 distinct values ($10, $100, $15…) | |
maintenance_per_share_usd |
number | 2.5 to 30 | US dollars |
pct_of_market_value |
number | 30 to 125 | percent |
Computed from Strasmore's warehouse of US exchange, SIP and OPRA market data. Equity prices are delayed; options greeks and implied volatility are end-of-day. This result is stored, not recomputed on load — it is exactly the numbers that were returned on , and the query below is what returned them.
the exact SQL behind every number
SELECT
concat('$', toString(price)) AS share_price,
round(if(price >= 5, greatest(5.0, 0.30 * price), greatest(2.5, toFloat64(price))), 2) AS maintenance_per_share_usd,
round(100.0 * maintenance_per_share_usd / price, 1) AS pct_of_market_value
FROM (SELECT arrayJoin([2, 4, 5, 10, 15, 20, 30, 50, 100]) AS price)
ORDER BY price
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