Claim check: Oil and stocks move together
“Oil and stocks move together: oil falling means stocks fall.”
What the data says
Partly Partly: the daily returns of oil and S&P 500 had a correlation of 0.298 over 2010-01-05 to 2026-11-10 (0.43 in the first half and 0.22 in the second), which is a link in the claimed direction, but weaker than the 0.30 we require for a clear one. The link is real but weaker than the saying implies.
It holds in some markets or periods, leans the right way without proof, or helps on risk but not on return.
Who says it
Media line since 2014-2016 and the 2020 oil crash.
Origins are as commonly cited and were not independently verified.
How we tested it
Correlation of daily returns between the oil ETF USO and SPY on common dates, for the full history and each half, with a 126-day rolling line. A correlation of at least 0.30 in the right direction in all three periods counts as moving together; between 0.10 and 0.30 as a weak link.
Results
| Pair | Days | Correlation | First half | Second half | Reading |
|---|---|---|---|---|---|
| Oil / S&P 500 | 4239 | 0.30 | 0.43 | 0.22 | Real but weaker |
Correlation by year
| Year | Correlation |
|---|---|
| 2010 | 0.72 |
| 2011 | 0.55 |
| 2012 | 0.58 |
| 2013 | 0.40 |
| 2014 | 0.15 |
| 2015 | 0.35 |
| 2016 | 0.44 |
| 2017 | 0.09 |
| 2018 | 0.38 |
| 2019 | 0.35 |
| 2020 | 0.42 |
| 2021 | 0.37 |
| 2022 | 0.11 |
| 2023 | 0.17 |
| 2024 | 0.04 |
| 2025 | 0.30 |
| 2026 | -0.44 |
Stability across the two halves of history
A saying that only works in one half of the history is not much of a rule. Each row shows the effect in the full history, the first half and the second half; green means the claimed effect was present.
| Market | Full history | First half | Second half |
|---|---|---|---|
| Oil / S&P 500 | 0.30 | 0.43 | 0.22 |
Context and cross-checks
Shown for context; not part of the verdict.
SPY on days when oil fell 3% or more
| Pair | Event days | Mean on event days | Mean on all days | Difference | Up share | t-stat | Reading |
|---|---|---|---|---|---|---|---|
| Oil / S&P 500 | 285 | -0.67% | +0.06% | -0.73% | 34% | -6.3 | Clear and stable |
The honest caveat
USO is a futures ETF with roll costs, so it differs from spot oil.
Descriptive statistics from historical data, before costs. Not a forecast and not investment advice.
Questions
Oil and stocks move together: oil falling means stocks fall.
Partly: the daily returns of oil and S&P 500 had a correlation of 0.298 over 2010-01-05 to 2026-11-10 (0.43 in the first half and 0.22 in the second), which is a link in the claimed direction, but weaker than the 0.30 we require for a clear one. The link is real but weaker than the saying implies.
How was this claim tested?
Correlation of daily returns between the oil ETF USO and SPY on common dates, for the full history and each half, with a 126-day rolling line. A correlation of at least 0.30 in the right direction in all three periods counts as moving together; between 0.10 and 0.30 as a weak link.