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IWM 21-Day Rule research

Public recipe: cash-secured wheel sized to equity, 35 DTE / 2% OTM puts and calls, manage at 21 DTE. Simulated window 2024-10-25 to 2026-10-23.

Two paired wheel simulations on IWM, one managed at 21 DTE. On this simulation the 21-Day Rule finished -12.3 pp behind holding to expiry — managing early hurt here.

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Arm-by-arm comparison

MetricStandard (hold to expiry)21-Day RuleDelta
Total return21.4%9.2%-12.3 pp
Annualized return10.2%4.5%-5.7 pp
Buy-and-hold return26.0%26.0%0.0 pp
Max drawdown (from peak equity)20.0%19.4%-0.6 pp
Assignment rate27.3%20.0%-7.3 pp
Call-away rate28.6%27.8%-0.8 pp
Average cycle return1.9%0.3%—
Sample cycles1130—
History days728728—
Entry fills1848—
Entry fills priced from real option bars50%50%—
21-DTE buy-backs priced from real option bars—52%—

How IWM compares

Across the 37 published tickers, the 21-Day Rule finished ahead of holding to expiry on 16 and behind on 21. The IWM total-return delta of -12.3 pp ranks 31st of 37 (1st is where managing early helped most); the median delta is -0.4 pp.

Without the rule, the standard arm returned 21.4% against 26.0% for buy-and-hold, so the plain wheel trailed holding the shares by 4.5 percentage points in this simulation.

Among its index and broad sector ETF peers DIA, QQQ and SPY, the rule finished ahead of holding to expiry on 1 of 3; IWM itself came in at -12.3 pp.

The separate 10 DTE / 2% OTM wheel snapshot for IWM shows a put assignment rate of 19.4% and wheel P&L of $5,219 against $5,686 for buy-and-hold. That is a different recipe from the 35 DTE study on this page, so the two results are not additive.

MetricIWMFamily medianRank (highest first unless noted)
Rule total-return delta-12.3 pp-0.4 pp31st of 37
Rule drawdown delta-0.6 pp-1.7 pp21st of 37 (lowest first)
21-Day total return9.2%16.8%29th of 37
21-Day annualized return4.5%8.1%29th of 37
Standard total return21.4%19.6%16th of 37
21-Day max drawdown19.4%19.0%20th of 37 (lowest first)
21-Day call-away rate27.8%42.1%29th of 37
Standard annualized return10.2%9.4%16th of 37
Buy-and-hold return26.0%42.2%24th of 37
Standard max drawdown20.0%20.2%18th of 37 (lowest first)
Standard assignment rate27.3%33.3%24th of 37
21-Day assignment rate20.0%31.0%28th of 37
21-Day sample cycles302811th of 37
21-Day average cycle return0.3%0.6%29th of 37
TickerStandard return21-Day returnRule deltaBuy-and-holdStandard drawdown21-Day drawdownStandard assignment21-Day assignment
IWM21.4%9.2%-12.3 pp26.0%20.0%19.4%27.3%20.0%
DIA21.2%13.7%-7.5 pp23.8%14.8%13.0%30.8%10.3%
QQQ19.6%17.4%-2.2 pp42.2%17.2%17.5%23.1%11.1%
SPY15.1%15.2%+0.2 pp31.2%14.7%16.9%12.5%8.3%

IWM wheel snapshot — the other published study on this ticker.

IWM buy-and-hold path

Month-end P&L of holding 100 IWM shares over the same window as this study, taken from the stored series of the 10 DTE wheel snapshot. The best month for holders was 2026-04 ($2,997) and the worst was 2024-12 (−$2,091).

MonthBuy-and-hold P&LChange in monthRunning highBelow its peakWorst fall so far
2024-10−$113—$357$470$470
2024-11$2,298$2,411$2,351$53$1,322
2024-12$207−$2,091$2,351$2,144$2,254
2025-01$759$552$2,351$1,592$2,557
2025-02−$424−$1,183$2,351$2,775$3,001
2025-03−$1,940−$1,516$2,351$4,291$4,430
2025-04−$2,403−$463$2,351$4,754$6,758
2025-05−$1,382$1,021$2,351$3,733$6,758
2025-06−$310$1,072$2,351$2,661$6,758
2025-07$50$360$2,351$2,301$6,758
2025-08$1,628$1,578$2,351$723$6,758
2025-09$2,307$679$2,595$288$6,758
2025-10$2,734$427$3,144$410$6,758
2025-11$2,986$252$3,144$158$6,758
2025-12$2,727−$259$3,891$1,164$6,758
2026-01$4,076$1,349$5,090$1,014$6,758
2026-02$4,252$176$5,090$838$6,758
2026-03$2,911−$1,341$5,090$2,179$6,758
2026-04$5,908$2,997$5,908$0$6,758
2026-05$7,154$1,246$7,314$160$6,758
2026-06$8,156$1,002$8,156$0$6,758
2026-07$7,231−$925$8,156$925$6,758
2026-08$7,504$273$8,620$1,116$6,758
2026-09$5,900−$1,604$8,620$2,720$6,758
2026-10$5,686−$214$8,620$2,934$6,758
Problem

A single ticker result is context, not a verdict

One ticker and one window prove nothing general; the rule arm sometimes cannot exit at 21 DTE

Solution

What this paired simulation produced

Window and freshness

Period 2024-10-25 to 2026-10-23, refreshed 2026-10-25.

Limitations

Premiums may include model fills (BSM/IV) when market quotes were missing.
  • Simulated results of one fixed recipe over one historical window; not collected income and not a prediction.
  • The rule arm could not exit at 21 DTE on 0 short options and held those to expiry.
  • Modelled pricing: real option bars priced 50% (standard) and 50% (21-Day) of entry fills and 52% of 21 DTE buy-backs; the rest used implied or realized volatility where market quotes were missing.

Frequently Asked Questions

Everything you need to know about getting started

Did the 21-Day Rule help on IWM?

On this simulation the 21-Day Rule finished -12.3 pp behind holding to expiry — managing early hurt here.

What recipe was simulated?

Same wheel, but the 21-Day arm buys each short option back at 21 DTE; an in-the-money put then takes the shares at that day's close and an in-the-money call delivers them.

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