SPX 0DTE Options Jump To 61% Share On Retail Resurgence

Implied volatilities decreased across asset classes last week, driven by moderating bond yields and positive economic data, with the VIXTLT index falling almost 20 points. The VIX index decline significantly outpaced the SPX spot rally. While overall SPX option volumes decreased from April highs, 0DTE options trading surged, representing a record 61% of total SPX volume in May, a 9% increase from the previous month.

Analysis

Implied volatilities experienced a broad-based decline across asset classes last week, prominently led by a significant reduction in interest rate volatility, with the VIXTLT index falling almost 20 points to 125bps vol as bond yields moderated. This decrease in volatility was reportedly driven by sustained trade optimism and stronger-than-anticipated US economic data. Notably, the VIX index's decline substantially outpaced the corresponding rally in the SPX spot market, with the spot rally accounting for less than half of the VIX movement. While overall SPX option volumes in May moderated from their April highs, there was a pronounced surge in zero-days-to-expiration (0DTE) options, which constituted a new record share of over 61% of total SPX volumes for the month, an increase of 9 percentage points from April.

Key Decisions for Investors

• Investors should monitor the sustainability of the current low implied volatility environment, as a reversion could present hedging opportunities or signal a shift in market sentiment driven by changes in trade outlook or economic data.
• The record concentration in 0DTE SPX options, now exceeding 61% of total volume, indicates a significant structural shift towards very short-term trading, which could amplify intraday market sensitivity and necessitate adjustments to risk management for strategies exposed to such flows.
• Given the decline in implied volatility, option selling strategies may face reduced premium income, while option buying strategies could appear more attractively priced, though the persistence of factors like trade optimism and positive economic data remains crucial to assess the longevity of this trend.