VIX recorded 28.2... Past 19 instances, S&P 500 3-month median 4.2%

The CBOE Volatility Index jumped more than 11 points intraday on the 5th, from 16.6 to 28.2, while the S&P 500 fell over 4% in a single day, marking the largest VIX spike since the week of the April 2025 tariff announcement, according to Bespoke Investment Group data cited by CNBC. Bespoke analyzed 19 instances since 1990 in which the VIX started below 20 and rose more than 5 points in one day, finding a median S&P 500 return of 4.2% after three months and 4.8% after six months, with positive returns in each period. The comparison matters because it frames the current volatility shock against historical episodes of sudden VIX surges from low levels, suggesting equity outcomes have tended to recover over medium-term horizons rather than extend losses. What to watch next is whether the S&P 500 tracks those historical median gains over the coming three- and six-month windows, or whether this episode breaks the pattern given the scale of the one-day move.