MCI vs WST: Correlation
Barings Corporate Investors (MCI) and West Pharmaceutical Services (WST) show a negative relationship: their 3-year correlation of weekly returns is -0.23.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are MCI and WST?
On 3 years of weekly data the MCI/WST correlation comes out at -0.23, negative, meaning they tend to move in opposite directions. The link has tightened recently: the 1-year correlation (-0.04) runs above the 3-year figure (-0.23). The 5-year figure is -0.07, and annualized covariance runs at -219.6 %².
WST is close to the least connected end of MCI's tracked universe, ranking #12 of 12. The last year tells two different stories: WST led by 48.8 percentage points, -7.7% for MCI against +41.1% for WST. One caveat on sizing: WST is 1.5 times as volatile as the other leg, so an equal-dollar split is far from equal-risk.
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.
MCI vs WST: side by side
| MCI (Barings Corporate Investors) | WST (West Pharmaceutical Services) | |
|---|---|---|
| 1-year return | -7.7% | +41.1% |
| 5-year return | +77.0% | -22.4% |
| Volatility (ann.) | 25.3% | 38.6% |
| Beta vs S&P 500 | 0.13 | 0.86 |
| Max drawdown (3Y) | -27.9% | -53.8% |
| Market cap | $0.4B | $24.4B |
| P/E (trailing) | 13.2 | 44.8 |
| Dividend yield | 8.73% | 0.25% |
| Sector / category | US Listed | Health Care |
Year-by-year returns
| Year | MCI | WST |
|---|---|---|
| 2022 | -5.9% | -49.7% |
| 2023 | +44.5% | +50.0% |
| 2024 | +20.8% | -6.8% |
| 2025 | -3.7% | -15.7% |
| 2026 | +3.7% | +26.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are MCI and WST good diversifiers for each other?
By historical standards, yes. A correlation of -0.23 means the two rarely move for the same reasons.
FAQ
What is the correlation between MCI and WST?
As of 2026-08-27, the correlation of weekly returns between MCI and WST is -0.23 over 3 years, -0.04 over 1 year and -0.07 over 5 years.
Is WST a good diversifier for MCI?
By historical standards, yes. A correlation of -0.23 means the two rarely move for the same reasons.
What does a correlation of -0.23 mean?
A reading of -0.23 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/mci-vs-wst.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/mci-vs-wst/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: MCI correlations · WST correlations
