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iPath Series B S&P 500 VIX Short-Term Futures ETN (VXX) vs State Street SPDR S&P 500 ETF Trust (SPY)
Correlation
of % moves
-73%
In sync
of periods
24%
History
daysdays · through 2026-07-09
1,254
These move in the same direction about 24% of the time
When one swings, the other often swings by a similar amount in the opposite direction (~54% of the pattern is shared).
Strong enough to use as a signal — check the stability and regime notes below before relying on it.
On a log scale so equal % moves take equal vertical space — best when one series has grown much faster than the other.
What to Watch
Decouples in drawdowns
The relationship weakens when both prices are falling — don't count on this pair as a hedge under stress.
Advanced
Statistics
In sync(i)
24%
Headline metric
Movement correlation(i)
-73%
Based on % moves
95% CI
N/A
Likely range
Pipeline
Pipeline Summary
1,254 paired data points survived the daily window.
Raw input
1,254
1,254
Normalized
1,254
1,254
Prepared
1,254
1,254
Aligned
1,254
1,254
Invalid removed
54%
Variance explained
Significance
N/A
Statistical confidence
Data points(i)
1,253
Deep
Time-Shifted Correlation
See how correlation changes when one series is offset in time. A taller bar at a non-zero shift means the two move together better when one leads the other — that's a potential lead/lag signal.
Correlation by shift
Click a bar to inspect. Range: -6 to 6 days.
Selected shift
No shift
Correlation at this shift
-73%
No shift — both series at their actual dates.
1,253 overlapping points at this shift
Baseline
-73%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
-73%
A non-zero peak suggests one series lines up better when shifted against the other.
Stability
How the correlation evolves over time. A stable line means the relationship is reliable; large swings signal regime-dependent behavior.
Do They Crash Together?
How these series behave when markets are rising, falling, or diverging. A correlation that holds in drawdowns is very different from one that only works in rallies.
Both Rising
+94%
6 periods · Return correlation when both series rose
Both Falling
+8%
18 periods · Return correlation when both series fell
Diverging
-43%
118 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
0
A: 0 / B: 0
Series A
iPath Series B S&P 500 VIX Short-Term Futures ETN (VXX)
VXX
Stock · 1,254 raw → 1,254 prepared
Series B
State Street SPDR S&P 500 ETF Trust (SPY)
SPY
Stock · 1,254 raw → 1,254 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
11
Estimated crossover points between normalized spreads.
Slope
-0.1899
Linear regression slope.
Intercept
-0.0000
Linear regression intercept.
Saved 2 months ago · ID: stock-spy_stock-vxx_daily_5y