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Fed Call vs House Call vs Exchange Call
Where each margin call line falls: 200 shares carried against a $10,000 debittable · 2026-09-12 · 3×5 The $65 close: what each maintenance call demands, met by deposit or by saletable · 2026-09-12 · 2×7
Where each margin call line falls: 200 shares carried against a $10,000 debit

Where each margin call line falls: 200 shares carried against a $10,000 debit

most recentas of table 3×5read in context →
Where each margin call line falls: 200 shares carried against a $10,000 debit — 3 rows by 5 columns, computed from US exchange, SIP and OPRA data.
call_typerequirement_pcttrigger_pricemarket_value_at_triggerequity_at_trigger
Fed call (50% initial)501002000010000
House call (30% maintenance)3071.43142864286
Exchange call (25% maintenance)2566.67133333333
the exact SQL behind every number 
SELECT
    call_type,
    requirement_pct,
    round(10000 / (1 - requirement_pct / 100) / 200, 2) AS trigger_price,
    round(10000 / (1 - requirement_pct / 100))          AS market_value_at_trigger,
    round(10000 / (1 - requirement_pct / 100) - 10000)  AS equity_at_trigger
FROM
(
    SELECT 'Fed call (50% initial)' AS call_type, 50 AS requirement_pct
    UNION ALL
    SELECT 'House call (30% maintenance)', 30
    UNION ALL
    SELECT 'Exchange call (25% maintenance)', 25
)
ORDER BY trigger_price DESC
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