Short Strangle vs Iron Condor: Margin

Short strangle vs iron condor comes down to two things the credit never shows: what the position ties up in buying power, and what happens outside the breakevens. Both trades sell an out-of-the-money put and an out-of-the-money call against the same range. The iron condor buys a further-out put and call on top of that, which caps the loss and swaps a percentage-based margin hold for fixed arithmetic.

Short strangle vs iron condor: the same core, two tails

Take a hypothetical stock trading at $100. Selling the $95 put and the $105 call for a combined $5.00 credit is a short strangle: $500 collected on a one-lot position, with breakevens at $90 and $110. Outside that band the position loses a dollar per dollar of underlying move, and nothing in the structure stops it. Selling both options at the same strike instead gives a short straddle, the tighter cousin covered in straddle vs strangle.

Now buy the $85 put and the $115 call against those short strikes. The position becomes an iron condor: four strikes forming two credit spreads around the same range. The long options are paid for out of the credit, so the net take drops, to $3.50 in this illustration. What the account gets in return is a floor. Ten points of width on the tested side is $1,000, less the $350 kept, so $650 is the most the position can lose. Selling both short strikes at a single strike instead gives the iron butterfly, compared in iron condor vs iron butterfly.

Every figure in this section is a round teaching number rather than a quote. The measured ones start below.

What does a short strangle tie up versus an iron condor?

Under Reg T, the exchange minimum on a naked short equity option is the greater of two calculations:

• 20% of the underlying value, less the amount by which the option is out of the money, plus the option's premium.
• 10% of the underlying value, plus the option's premium.

For a strangle on one underlying, the requirement is the larger of the two single sides, plus the premium collected on the other side. Run the hypothetical through it. One contract covers 100 shares, so the underlying value is $10,000. The $105 call sits $5 out of the money: 20% of $10,000 is $2,000, less $500, plus a $2.50 premium ($250 per contract), which comes to $1,750. The 10% calculation gives $1,250, so the $1,750 stands. The $95 put works out the same way. The hold is $1,750 plus the other side's $250, or $2,000.

The condor's requirement is a subtraction rather than a percentage: the width of the wider spread times 100, less the credit received. Ten points wide is $1,000, less $350, or $650. That figure is set at entry and does not move when the underlying does. The strangle's moves with both the underlying price and the premium, every day the position is open.

The exchange minimum is a floor, and it is not the number your account posts. Brokers set house requirements above it and publish the current schedule in their own margin disclosures. Those requirements tend to rise around events and on volatile names. Portfolio-margin accounts replace the formulas with a stress test, covered in Reg T margin vs portfolio margin, and the naked side of the arithmetic is worked through in margin for selling naked options.

What do the wings cost?

The wings are the whole difference between the two structures, and their price is measurable. The panel below groups SPY contracts with 25 to 45 days to expiry by how far the strike sat from the underlying's close, over the three months through July 2026, and averages the daily closing mark in each bucket.

SELECT
    concat(toString(bucket), ' to ', toString(bucket + 2), '% out of the money') AS strike_distance,
    round(avgIf(price, side = 'put'), 2)                                         AS avg_put_price,
    round(avgIf(price, side = 'call'), 2)                                        AS avg_call_price,
    round(avg_put_price - avg_call_price, 2)                                     AS put_call_spread
FROM
(
    SELECT
        side,
        price,
        toUInt8(floor(distance * 50) * 2) AS bucket
    FROM
    (
        SELECT
            if(lower(option_type) IN ('put', 'p'), 'put', 'call')      AS side,
            toFloat64(option_close)                                    AS price,
            toFloat64(strike_price) / toFloat64(underlying_close) - 1  AS strike_offset,
            abs(strike_offset)                                         AS distance
        FROM global_markets.options_greeks
        WHERE underlying_symbol = 'SPY'
          AND date >= '2026-05-01'
          AND date <  '2026-08-01'
          AND iv_converged = 1
          AND volume > 0
          AND days_to_expiry BETWEEN 25 AND 45
          AND toFloat64(underlying_close) > 0
          AND lower(option_type) IN ('put', 'p', 'call', 'c')
    )
    WHERE distance < 0.12
      AND ((side = 'put' AND strike_offset < 0) OR (side = 'call' AND strike_offset > 0))
)
GROUP BY bucket
HAVING countIf(side = 'put') > 50 AND countIf(side = 'call') > 50
ORDER BY bucket

A put 0 to 2% out of the money averaged $9.93, quoted per share, so 100 times that per contract. Out at 10 to 12% out of the money, the average put mark was $1.42 against $0.09 for the call the same distance the other way. That gap of $1.33 is downside skew: puts a given distance below spot carry a higher price than calls the same distance above it, which makes the put wing the expensive half of a condor.

The shape of that curve is the condor's argument. Protection bought well away from spot costs a fraction of what the short strikes bring in, and it converts an open tail into a fixed one. How much of the credit it hands back varies by name. The next panel prices short strikes roughly 5% from spot and wings roughly 10% out, on 5 household underlyings, using the same window and the same expiry band.

SELECT
    symbol,
    round(avgIf(price, side = 'put'  AND strike_offset BETWEEN -0.06 AND -0.04)
        + avgIf(price, side = 'call' AND strike_offset BETWEEN  0.04 AND  0.06), 2) AS strangle_credit,
    round(avgIf(price, side = 'put'  AND strike_offset BETWEEN -0.11 AND -0.09)
        + avgIf(price, side = 'call' AND strike_offset BETWEEN  0.09 AND  0.11), 2) AS wing_cost,
    round(strangle_credit - wing_cost, 2)                                           AS condor_credit,
    round(100 * wing_cost / strangle_credit, 1)                                     AS wing_share_pct
FROM
(
    SELECT
        underlying_symbol                                          AS symbol,
        if(lower(option_type) IN ('put', 'p'), 'put', 'call')       AS side,
        toFloat64(option_close)                                     AS price,
        toFloat64(strike_price) / toFloat64(underlying_close) - 1   AS strike_offset
    FROM global_markets.options_greeks
    WHERE underlying_symbol IN ('SPY', 'AAPL', 'MSFT', 'NVDA', 'KO')
      AND date >= '2026-05-01'
      AND date <  '2026-08-01'
      AND iv_converged = 1
      AND volume > 0
      AND days_to_expiry BETWEEN 25 AND 45
      AND toFloat64(underlying_close) > 0
      AND lower(option_type) IN ('put', 'p', 'call', 'c')
)
GROUP BY symbol
HAVING countIf(side = 'put'  AND strike_offset BETWEEN -0.06 AND -0.04) > 20
   AND countIf(side = 'call' AND strike_offset BETWEEN  0.04 AND  0.06) > 20
   AND countIf(side = 'put'  AND strike_offset BETWEEN -0.11 AND -0.09) > 20
   AND countIf(side = 'call' AND strike_offset BETWEEN  0.09 AND  0.11) > 20
ORDER BY strangle_credit DESC

MSFT carried the largest average credit at $18.1 per share across the two short legs. The pair of wings around it averaged $9.15, or 50.6% of the credit, leaving $8.95 net. Read down the wing share column and the trade-off stops being abstract. That percentage is charged on every position opened. The tail it insures against turns up in a minority of them.

How often does price travel past a wing?

A wing matters only when price reaches it. The panel below takes twenty years of SPY closes, measures the move over the following 21 trading sessions (roughly one calendar month, the life of a standard monthly position), and counts how often that move exceeded a given distance in either direction.

SELECT
    concat(toString(t.threshold), '% away from spot')                  AS wing_distance,
    countIf(abs(m.move_pct) >= t.threshold)                            AS windows_breached,
    round(100 * countIf(abs(m.move_pct) >= t.threshold) / count(), 1)  AS share_of_windows_pct
FROM
(
    SELECT 100 * (close_fwd / close_now - 1) AS move_pct
    FROM
    (
        SELECT
            close_now,
            any(close_now) OVER (ORDER BY date ROWS BETWEEN 21 FOLLOWING AND 21 FOLLOWING) AS close_fwd
        FROM
        (
            SELECT
                date,
                toFloat64(any(close)) AS close_now
            FROM global_markets.stocks_daily_aggs
            WHERE ticker = 'SPY'
              AND date >= '2006-01-01'
              AND date <  '2026-01-01'
            GROUP BY date
        )
    )
    WHERE close_fwd > 0
) AS m
CROSS JOIN
(
    SELECT arrayJoin([3, 4, 5, 6, 8, 10]) AS threshold
) AS t
GROUP BY t.threshold
ORDER BY t.threshold

A strike or wing sitting 3% away from spot was passed in 46.8% of those windows, 2346 of them. Out at 10% away from spot, the share drops to 3.6%. Those are historical frequencies over the exact window written into the SQL, not forecasts. The condor pays the wing price on every trade to turn that last slice of months into a capped outcome. The strangle keeps the premium and carries the slice.

Gaps, and what the wings are actually for

Inside a session a strangle can be closed or adjusted. The exposure that no adjustment reaches is the overnight gap: the underlying opens somewhere other than where it closed. The panel below counts ten years of opening gaps on five household names, measured open against the prior close.

SELECT
    ticker                                                AS symbol,
    countIf(abs(gap_pct) >= 3)                            AS sessions_gapping_3pct_plus,
    round(100 * countIf(abs(gap_pct) >= 3) / count(), 2)  AS share_of_sessions_pct,
    round(max(abs(gap_pct)), 1)                           AS largest_gap_pct
FROM
(
    SELECT
        ticker,
        date,
        100 * (toFloat64(open) / prev_close - 1) AS gap_pct
    FROM
    (
        SELECT
            ticker,
            date,
            open,
            any(toFloat64(close)) OVER (PARTITION BY ticker ORDER BY date
                                        ROWS BETWEEN 1 PRECEDING AND 1 PRECEDING) AS prev_close
        FROM
        (
            SELECT
                ticker,
                date,
                any(open)  AS open,
                any(close) AS close
            FROM global_markets.stocks_daily_aggs
            WHERE ticker IN ('SPY', 'AAPL', 'MSFT', 'NVDA', 'KO')
              AND date >= '2016-01-01'
              AND date <  '2026-01-01'
            GROUP BY ticker, date
        )
    )
    WHERE prev_close > 0
      AND (ticker, date) NOT IN (SELECT ticker, execution_date FROM global_markets.stocks_splits)
)
GROUP BY ticker
ORDER BY sessions_gapping_3pct_plus DESC

NVDA opened 3% or more away from its prior close on 172 sessions across those ten years, 6.85% of them, and its largest single gap measured 26.1% in one direction or the other. The quietest name in the group by that count, KO, still printed 20 such mornings.

On a morning like that the condor is arithmetic. The maximum loss was known at entry and the long wing is already owned, so a gap far through a short strike changes the timing of the outcome rather than its size. The strangle is the opposite case. The loss keeps pace with the underlying, and the margin requirement grows alongside the move, which is how a maintenance call and a mark-to-market loss can land on the same morning.

Assignment and pin risk: two strikes or four

Single-name equity options are American style, exercisable on any business day, so a short strike that goes in the money carries early assignment exposure at any point in its life; the mechanics are in American vs European options. The strangle has two short strikes and nothing long behind them, so an assignment on the put delivers 100 shares per contract that the account has to fund. The condor has those same two short strikes plus two long ones, and the long wing can be exercised to close out the delivery at a known price. It also leaves four strikes to track through expiration week instead of two, and a dividend on a name with an in-the-money short call raises the odds of early exercise the day before the ex-dividend date.

Pin risk is the expiration-day version: the underlying settles within pennies of a short strike, and the holder learns after the close whether the contract was exercised, potentially carrying an unhedged stock position into the next session. Four strikes give that a wider band to happen in than two. Cash-settled index products with morning settlement behave differently, which AM vs PM settled options covers.

One account-level difference is worth noting. Most retirement accounts do not permit a naked short call at all, while defined-risk spreads are commonly permitted, as set out in trading options inside an IRA.

FAQ

Does an iron condor always require less buying power than a short strangle?

No. The condor's hold is the wing width times 100, less the credit, so wings placed far apart can hold more than a percentage-based requirement. In the $100 example above, 10-point wings hold $650 against the strangle's $2,000. Widen those wings to 40 points and the comparison inverts.

What is the margin requirement for a short strangle?

The exchange minimum is the greater of the two single-side calculations, 20% of underlying value less the out-of-the-money amount plus premium, or 10% of underlying value plus premium, with the other side's premium added on top. Broker house requirements sit above that floor and change over time, so the figure shown in your own platform is the one that governs the account.

Is an iron condor just a short strangle with protection?

Structurally, yes. Buying a further out-of-the-money put and call against an existing short strangle converts it into an iron condor. The credit falls by what the wings cost, the maximum loss becomes wing width less credit, and the buying-power hold switches from the percentage formula to spread arithmetic once both wings are in place.

Which structure carries more assignment risk?

Both carry the same early-assignment exposure on their short strikes, since those strikes are what a counterparty exercises against. They differ at the point of delivery. The condor's long wing can be exercised to cap the cost of an assignment, while the strangle's assignment lands on the account's own capital.

Every panel on this page ships with the SQL that produced it, so the wing prices and the breach frequencies can be re-run on any name and any window. To price a strangle and the wings around it on a ticker you follow, ask for it in plain English on the Strasmore terminal.