Earnings Impact

Stocks can move significantly on earnings. Options IV rises before earnings, falls after (IV crush).

Strategies

  • Straddle/Strangle before earnings
  • Iron condor for range-bound
  • Post-earnings momentum

Timing

  • Enter 1-2 weeks before earnings
  • Close before announcement
  • Avoid holding through earnings

Risk Management

  • Position size smaller than usual
  • Expected move calculation
  • IV crush planning

The Earnings Calendar Is Your Trade Diary

Earnings season in India produces a compressed calendar of announcements that swing option premiums across index and stock names. The days before a result are marked by implied volatility inflation, and the post-result session is marked by an implied-volatility crash, regardless of the price direction. A trader who understands this map can trade both the run-up and the aftermath with defined risk.

The Volatility Crush, Explained

Implied volatility peaks roughly 48 hours before the announcement because uncertainty is highest then. Immediately after the result, the uncertainty collapses and the market removes the risk premium: the options lose value rapidly even when price moves sharply. Buying straddles before results is therefore a race against both direction and the volatility crush; the buyer needs a move larger than the pre-result volatility implies.

Trade Structures for Earnings

  • Straddle buy: Buy equal calls and puts at-the-money; works only if the post-result move beats the crush, roughly 8-10% for a typical large-cap result.
  • Calendar spread: Buy the far-month option and sell the front-month; the calendar profits as the near-month premium collapses into the report.
  • Iron fly or short strangle: Sell both wings before results, taking the theta against the crush while capping risk.
  • 74 delta ratio: Build a call-heavy or put-heavy ratio based on the expected skew of the mover.

Position Sizing for Results

An earnings move is a binary event, so position size should reflect the probability of either outcome. Allocate a smaller slice of the book to straddle buys than to defined-risk structures; the tail that destroys a straddle buyer is a modest move with a large crush. Set a precise exit before entering: if the stock moves favourably, sell half into the open and trail the rest; if it gaps against you, accept the defined loss without adding.

The Post-Earnings Drift

After the initial spike, many Indian large caps exhibit a slow drift in the direction of the surprise over the following two to three sessions. Weekly options let you sell the post-crush premium with a directional tilt; the setup is often more reliable than the pre-result gamble because the fat uncertainty has already been removed from the curve.

The Expected Move: Read the Market's Own Pricing

Every earnings date ships with a market-priced move, and that number is the budget for every strategy:

  • Take the ATM straddle's price as the implied absolute move; Nifty or a stock expected to move 4% is priced by the straddle near 4%, not by your forecast.
  • Compare the implied move to history: a 7% implied move for a stock whose last eight results moved 3% is overpriced gamma; selling the premium earns a repeatable edge.
  • Never buy an event long gamma when the implied move exceeds your forecast's confidence band; you are fighting the market's own pricing of the same day.

The Crush Mechanics, Step by Step

The volatility crush is the event's settlement bill, and sellers harvest it:

  • Pre-result: IV balloons as uncertainty accumulates into the print, inflating every straddle and condor you own or sell.
  • At/after results: the uncertainty dissolves in hours, and far-OTM wings that were priced on fear collapse by 30-60% of premium in days.
  • The seller's playbook: enter defined-risk credit structures 3-5 days before results when IV rank is elevated, exit at 40-60% of credit, and never carry a naked short through the event's gap itself.

Strangle Versus Iron Condor on Result Day

The structural choice on results resolves to one difference: the tail you keep or cap:

  • Strangle (long or short) keeps tail exposure; a short strangle owns the full gap move and dies on a 12% surprise after a quiet year.
  • Iron condor caps the tail: you sell the crush with defined loss, acceptable because event-gaps are exactly the weeks defined risk earns its premium.
  • Winners run asymmetry: long straddles on under-priced big movers can double; their losers die of timing, which is why they suit only low-rank, obvious-chaos entries.

The Post-Earnings Drift, Exploited

Indian equities show a post-earnings drift, and the drift is the second half of the earnings trade:

  • After a surprise beat, momentum often continues 10-20 sessions before the mean-reversion fully bites; swing longs ride it with trailing stops.
  • Options bought before results, held past the print into the drift, lose the crush premium; the drift is a stock-timing trade, not an options-crush trade.
  • A clean long vertical (call debit spread) bought immediately after results, on verified delivery, collects the drift at a discount to the pre-event IV.

Position Sizing Across the Season

Portfolios buy earnings books in the season, not in the scare:

  • Cap any single-result window at 3-5% of account risk; ten names reporting over a fortnight is a portfolio, ten identical nuls are a coin flip.
  • Diversify drivers: bank results, IT names and consumption names rarely crash together, and that uncorrelated blend is the earnings season's real edge.
  • Run a results ledger: event, implied move, realised move, your position, your outcome; thirty rows of that ledger is the best earnings-strategy education in India.

Earnings season is volatility's festival: premiums inflate, crush after the print, and drift rewards the organised. Read the implied move, sell the crush with defined wings when rank is high, buy cheap gamma only at low ranks, size each event as an incident, and log every result; the trader who treats earnings as a portfolio engine rather than a roulette day compounds the season for years.