The Cboe Volatility Index, a measure of market anxiety, is near its highest levels since May. Michael M. Santiago / Getty Images Close Key Takeaways Nvidia's quarterly results are almost here, and anxiety is running high. The Cboe Volatility Index (VIX), known as Wall Street's Fear Index, on Tuesday ended the day just below 25, near its highest level since May, when the market was cooling off from April's tariff tantrum. The index has risen substantially in the past week after coasting along in the mid-teen ...