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Case Study: Earnings IV Crush

Case Study: Earnings IV Crush

A worked, illustrative walkthrough of a defined-risk iron condor sold into elevated pre-earnings implied volatility. It shows the three things that make an earnings premium trade tick: the expected move the options imply, the overnight IV crush that resolves the binary event, and how a short-premium position profits even on a modest price move — while making the case for defined risk when the catalyst is binary.
This is a teaching example with round, invented numbers. It is not a recommendation, not a backtest, and not a record of a real trade. Every price, credit, and Greek below is fabricated for clarity and labeled accordingly. The rules it illustrates are cited to the research; the trade is illustrative.

This case study sits on top of the foundations: 03_implied_volatility for IV Rank, the expected move, and IV crush; 10_iron_condors for the structure; 05_trade_management for the 50% / 21-DTE exit logic; 08_defined_risk for why a capped-loss structure is preferred around binary events; and 02_probability for delta-as-probability strike selection.

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1. Scenario & Thesis

The setup. A fictional large-cap stock, XYZ, reports earnings after the close in two days. As is typical into a known binary event, the options market has bid up implied volatility: front-month IV has climbed well above its recent baseline, pushing XYZ's IV Rank to ~75. Elevated IV is the green light premium sellers use to sell premium: at IVR > 50 options are richly priced, the credit is fatter, and the breakevens sit wider.

Why IV is elevated — and why it will collapse. Pre-earnings, the front-month options price in the uncertainty of the report. The instant earnings are released, that uncertainty resolves and front-month IV crushes — it can shed 30–50% (or more) overnight regardless of which way the stock moves, because the event the options were pricing has passed. This collapse is a vega event, and a short-premium seller is short vega — so the seller profits from the crush itself, separate from where the stock lands.

The structural edge. The central earnings thesis is that the options-implied expected move tends to overstate the move the stock actually makes. Into earnings IV spikes, but "the expected move number can overstate the actual move," letting a seller collect richer premium, widen the strikes, and improve probability of profit. The companion edge is that stocks tend to finish inside their expected move more often than not — the same volatility-risk-premium that powers the whole short-premium program.

The thesis in one sentence. Sell a defined-risk iron condor into XYZ's inflated pre-earnings IV, positioned so the short strikes sit at the edge of the expected move; profit when the post-report IV crush deflates the options and the stock finishes inside that range — and accept a known, capped loss if the stock gaps beyond it.

Why defined risk for this trade. Earnings is a binary event: the stock can gap far beyond the expected move overnight, and no intraday adjustment can save an undefined-risk position from a gap that happens while the market is closed. The research comparing an undefined-risk straddle to a defined-risk iron fly over a long sample found the largest loss on the straddle was over 5x that of the defined-risk structure — defined risk "protects from large moves" at the cost of some profit. For a binary catalyst, that capped tail is exactly the protection you want. See 08_defined_risk.

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2. Entry

All numbers below are illustrative round figures.

Underlying & environment

Computing the expected move. With XYZ at $200, ~60% IV, and ~30 DTE, the expected (≈1 standard deviation, ~68%) move is:

So the options imply a ~68% chance XYZ finishes between $186 and $214 at expiration. We will sell the short strikes at the edges of that expected move.

The structure — a 5-wide iron condor at ~16Δ. Short strikes near the 16-delta / 1-standard-deviation level on each side (delta ≈ probability of finishing ITM), with $5 protective wings to cap risk:

Pricing, breakevens, POP, and Greeks at entry

Note the breakevens ($183.35 / $216.65) sit outside the expected-move edges ($186 / $214). The credit pushes the breakevens past the 1-SD band — the structural cushion that makes the trade win on a modest move.

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3. Timeline / What Happened

The key visual: XYZ moved up $6 — a real directional move — yet the position made money, because (a) $206 is comfortably inside the $185–$215 short-strike range, and (b) the IV crush deflated every leg's extrinsic value at once. The crush did most of the work; the modest move did the rest.

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4. Management Decisions

Each decision below ties to a cited rule.

Decision 1 — Take the winner at ~50% of max profit. The day after the report, the condor sat at ~58% of max profit. The house rule is to close at ~50% of max profit — "taking risk off the table and locking in profits." That 50% target is a documented, study-backed rule: managing winners at 50% improves the win rate and the P/L distribution versus holding to expiration. Because the entire earnings edge (the crush) had already been captured overnight, there was no reason to hold for the last few dollars of decay — the remaining theta did not justify the remaining gamma risk. See 05_trade_management.

Note on the 25% variant. The aggressive undefined-risk analogue (the short straddle) is managed at a lower ~25% target because it collects far more premium and its P/L is more volatile. For this defined-risk condor, the standard ~50% target applies. The point: match the profit target to the structure.

Decision 2 — The 21-DTE time stop never had to fire. Had the stock chopped sideways with a weaker crush and the trade not reached its target, the next rule in line is the 21-DTE time stop: close or roll at ~21 days to expiration regardless of P/L, to escape accelerating late-cycle gamma. Here the trade resolved at T+1 — the morning after earnings — so 21 DTE was a backstop that was never reached. The canonical phrasing remains: "manage at 50% or 21 DTE, whichever comes first."

*Decision 3 — Untested-side defense (the path not taken, and why). Suppose instead the report had been worse and XYZ had slid toward the $185 short put (the tested side). The standard defense is to roll the untested (call) spread down toward the price for a credit, widening the tested-side breakeven and re-centering the position — defend the untested side, never the tested side.* The roll can go as far as the same short strike as the tested side, converting the condor into an iron fly for maximum extra credit. But two cautions specific to earnings:

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5. Outcome

Base case (what happened): a winner.

The trade captured roughly $95 per condor in about three days, driven mainly by the overnight IV crush (vega) and helped by the stock finishing well inside the short strikes.

The risk case (what defined risk protected against): a gap beyond the expected move. Suppose XYZ had missed badly and gapped down to $176 overnight — beyond the $180 long put and well past the ~$186 lower edge of the expected move. The put spread goes to max loss; the call spread expires worthless:

The loss is $335 — and not a dollar more, no matter how far XYZ gapped. An undefined-risk short strangle at the same $185/$215 strikes would have collected a larger credit (say ~$2.50) but, on the same gap to $176, kept losing past the strike with no floor — and on a true outlier earnings move, the loss could run into the thousands per contract. This is the defined-vs-undefined trade-off the research quantified: the largest straddle loss in that study was over 5x the defined-risk version's.

The risk/reward in one line: the condor risked $335 to make up to $165, with a ~60% POP and a hard cap on the binary tail. You give up credit and some win probability versus a strangle; in exchange you can never be surprised by the overnight gap that earnings exists to produce. For a binary event, that is the trade the defined-risk research endorses.

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6. Lessons

1. The crush, not the direction, is the edge. The position made money on a +3% up move because front-month IV collapsed ~47% overnight and the short-vega structure deflated. You are trading volatility, not picking a direction.

2. Sell the expected move, get paid for the overstatement. IV into earnings tends to overstate the realized move; selling strikes at the ~16Δ edge of the expected move and collecting the inflated credit harvests that gap.

3. Enter only when IV Rank is genuinely high. The entire edge rests on selling expensive options that have room to deflate. Pre-earnings IVR ~75 qualifies; a cheap underlying with low IVR does not — there is nothing to crush.

4. Defined risk is non-negotiable for binary events. The move happens overnight with the market closed; no adjustment can rescue an undefined position from a gap. The wings cap the loss by structure at entry — the documented straddle-vs-defined-risk gap (largest loss >5x) is the whole argument.

5. Take the winner — don't get greedy after the crush. Once the crush has fired, the bulk of the edge is realized. Closing at ~50% of max profit (here ~58%) banks the gain before the remaining gamma can reverse it; the leftover theta is not worth the risk.

6. Know the loss before you place the trade. Max loss ($335), max profit ($165), breakevens, and POP were all fixed and visible at entry. That is the defining advantage of the defined-risk approach — you size to a known worst case rather than a floating one.

7. The trade-off is real and accepted. Lower credit and lower POP (~60% vs a strangle's ~70%+) is the price of the capped tail. For binary earnings, that is a price worth paying.

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Sources

Primary options-education — verified, directly-fetchable pages:

Primary research — real, search-indexed episode URLs (these episode pages return errors to automated fetching, so their quantitative results are reported from search summaries and tagged Conf Med; no URL is fabricated):

Cross-references: 03_implied_volatility · 10_iron_condors · 05_trade_management · 08_defined_risk · 02_probability · 20_position_sizing · 09_strangles/short-straddle.md · 18_research_findings/21-dte-management.md

Sourcing note. The six options-education `/learn/`, `/concepts-strategies/`, and Help Center pages above were verified directly and supply the structural facts: the iron-condor structure and formulas, the IV-Rank > 50 / ~16Δ entry conventions, the expected-move formula, vega/short-vega behavior, and the 50%-of-max-profit and untested-side-defense rules. The research-study episode URLs are real, search-indexed pages whose results (the >5x straddle-loss figure, the "expected move overstates the actual move" earnings finding, the IV-crush magnitude, the 50% and 21-DTE management studies) are reported from search summaries and tagged Conf Med because the episode pages return errors to automated fetching. Every dollar amount, price, credit, Greek, and percentage in the worked trade is illustrative and invented for teaching; this is not a backtest or a record of a real trade. No URL in this document is fabricated.

_Evidence-labeled per the Project Charter. Education only, not financial advice._