The MOVE Index: Measuring Treasury Volatility & Yield Curve Uncertainty
How the ICE BofA MOVE Index calculates implied Treasury bond volatility via swaptions and options, and why MOVE vs. VIX divergence signals macro inflection points.
1. What Is the MOVE Index?
The ICE BofA MOVE Index (Merrill Lynch Option Volatility Estimate) is the bond market's equivalent of the equity VIX Index. It measures 30-day normalized implied volatility in the U.S. Treasury market by analyzing over-the-counter (OTC) options across the entire yield curve.
Unlike equity volatility indices that focus on a single index (S&P 500), the MOVE Index aggregates option prices across four key benchmark maturities: 2-Year, 5-Year, 10-Year, and 30-Year Treasuries.
2. Mathematical Construction & Weighting Formula
The MOVE Index is calculated as a weighted average of normalized implied volatility ($\sigma_{ ext{norm}}$) derived from 1-month constant-maturity options on Treasury futures and swaptions:
Because the 10-Year Treasury is the global risk-free discount anchor for mortgage pricing, corporate credit, and global discount cash flows, it receives the highest weighting (40%).
3. Reading MOVE Index Regimes
| MOVE Level | Market Regime | Macro Implication |
|---|---|---|
| < 70 | Complacent / Low Volatility | Predictable Fed policy, stable term premia, tight credit spreads, favorable carry environment. |
| 70 – 110 | Normal Transition Range | Standard economic cycle adjustments, moderate FOMC repricing, typical market liquidity. |
| > 120 | Systemic Rates Stress | Severe policy uncertainty, liquidity fragmentation in Treasuries, risk of forced hedge fund deleveraging. |
4. The MOVE / VIX Divergence Signal
Because rate volatility directly impacts equity discount rates via Equity Risk Premium (ERP) and bond duration, a spike in the MOVE Index while the VIX remains subdued is a classic late-cycle warning signal. Equities cannot indefinitely sustain low volatility when the underlying discount rate is experiencing massive daily swings.