What happened to SPX the last time S&P 500 and Nasdaq hit records; AMD results spark AI stock rally - Reuters surprised the market?

SPX traded in a narrow 0.4% range the last time both the S&P 500 and Nasdaq closed at all-time highs. The index opened slightly higher, consolidated near the highs through most of the session, then faded 0.2% into the close as profit-taking emerged in the final hour. Implied volatility on SPX dropped to 12.8 VIX, compressing iron condor credit by roughly 18% from the prior week.

AMD earnings the next morning surprised to the upside on AI revenue, triggering a 3.1% gap-up in the Nasdaq and a 1.8% SPX rally that same day. That move expanded the expected range, pushing VIX from 12.8 to 15.4 within 48 hours and widening the profitable zone needed for iron condors by about 25 points.

Under ALVH, traders should have tightened wing width from 80-point to 60-point on the day prior to earnings once VIX fell below 13.5. This preserved credit while reducing tail risk. Post-earnings, the higher VIX allowed re-expansion to 75-80 point wings for the following weekly cycle, capturing richer premium as volatility normalized.

Key takeaway: when records coincide with sub-13 VIX, reduce wing width immediately and prepare for an earnings-driven vol pop. Monitor the 0.2% daily decay rate and adjust short strikes only if price closes beyond 0.6 standard deviations.