RSP vs WPRT: Correlation
How closely do Invesco S&P 500 Equal Weight ETF (RSP) and Westport Fuel Systems Inc (WPRT) trade together? Their weekly returns over three years give a correlation of 0.44, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are RSP and WPRT?
Across a 3-year window, the weekly returns of RSP and WPRT correlate at 0.44, moderate. The link has loosened recently: the 1-year correlation (0.24) runs below the 3-year figure (0.44). Stretching to 5 years gives 0.45, with an annualized covariance of 297.5 %².
Among the 250 assets we track against RSP, WPRT ranks #226 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months RSP outperformed by 54.7 percentage points (+19.2% for RSP against -35.5% for WPRT). Note the risk asymmetry: WPRT runs 3.9 times the annualized volatility of the other leg, so equal-weighting the two is not an equal-risk position.
How is this computed?
Pearson correlation on weekly returns: ρ(A,B) = cov(rA, rB) / (σA · σB), over windows of 52, 156 and 260 weeks. Covariance is annualized (×52) and expressed in %². Full definitions on the methodology page.
RSP vs WPRT: side by side
| RSP (Invesco S&P 500 Equal Weight ETF) | WPRT (Westport Fuel Systems Inc) | |
|---|---|---|
| 1-year return | +19.2% | -35.5% |
| 5-year return | +53.9% | -95.2% |
| Volatility (ann.) | 13.2% | 51.7% |
| Beta vs S&P 500 | 0.77 | 1.44 |
| Max drawdown (3Y) | -17.8% | -80.0% |
| Market cap | – | – |
| P/E (trailing) | – | – |
| Dividend yield | 1.49% | 0.00% |
| Expense ratio | 0.20% | – |
| Assets under management | $97.3B | – |
| Sector / category | ETF · US Large Cap | US Listed |
On the fund side, RSP sits in the Large Blend category at Invesco, with $97.3B under management, 505 holdings, a 0.20% expense ratio, a 1.49% trailing dividend yield.
Year-by-year returns
| Year | RSP | WPRT |
|---|---|---|
| 2022 | -11.6% | -67.5% |
| 2023 | +13.7% | -14.0% |
| 2024 | +12.8% | -45.9% |
| 2025 | +11.2% | -56.1% |
| 2026 | +16.5% | +17.8% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are RSP and WPRT good diversifiers for each other?
A fair diversifier. At 0.44, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between RSP and WPRT?
The RSP/WPRT correlation stands at 0.44 on a 3-year window (1 year: 0.24, 5 years: 0.45), computed from weekly returns as of 2026-08-27.
Is WPRT a good diversifier for RSP?
A fair diversifier. At 0.44, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.44 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/rsp-vs-wprt.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/rsp-vs-wprt/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: RSP correlations · WPRT correlations
