MOVE Index and SPX returns

 MOVE index (Merrill Lynch Option Volatility Estimate) was developed by Merrill Lynch to measure implied volatility of US Treasury markets. ML became a part of Bank of America in 2008, and then indexes were sold to ICE in 2019, so now the index is called "ICE BofAML MOVE Index"

The index is a yield-curve weighted average of normalized implied volatility of 30-day options. The index has been in existence for several years now, however it is seldom discussed, either in itself, or in relationship to the VIX. What I am interested in is if volatility in the treasury market can be used to predict SPX returns.

VIX and MOVE are highly correlated - this is obvious from the time series charts.

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