SP500 xStock (SPYX) is 40.0× the size of Vanguard xStock (VTIX) by market capitalisation. Their daily returns move barely together (correlation 0.11 across 40 shared trading days). VTIX has been the more volatile of the two, at 40% annualised against SPYX's 11%.
VTIXSPYX
0.11over 40 shared trading days
Measured on daily returns rather than on prices. Two assets that both simply trend upward score near 1.0 on raw prices whether or not they move together, so returns are what answer the question people mean by correlation.
| Metric | VTIX | SPYX |
|---|---|---|
| Max drawdown (400d) | -19.0% | -2.7% |
| Risk-adjusted return (90d) | 0.01 | -0.14 |
| Best 30 days (past year) | +17.2% | — |
| Worst 30 days (past year) | -6.7% | — |
Relative strength over 90 days: SPYX outperformed VTIX by 1.9% — measured on the VTIX/SPYX ratio, so it holds regardless of market direction.