WST vs. VOO
WST (West Pharmaceutical Services, Inc.) is a stock, while VOO (Vanguard S&P 500 ETF) is S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, WST returned 15.91%/yr vs 15.14%/yr for VOO. Their 0.54 correlation means they have sometimes moved together and sometimes differently.
Performance
WST vs. VOO - Performance Comparison
Loading charts...
Returns By Period
In the year-to-date period, WST achieves a 24.21% return, which is significantly higher than VOO's 10.16% return. Both investments have delivered pretty close results over the past 10 years, with WST having a 15.91% annualized return and VOO not far behind at 15.14%.
WST
- 1D
- 0.40%
- 1M
- -6.71%
- 6M
- 47.73%
- YTD
- 24.21%
- 1Y
- 42.95%
- 3Y*
- -2.56%
- 5Y*
- -3.45%
- 10Y*
- 15.91%
- ALL TIME*
- 11.71%
VOO
- 1D
- 0.71%
- 1M
- 0.26%
- 6M
- 8.58%
- YTD
- 10.16%
- 1Y
- 21.58%
- 3Y*
- 19.42%
- 5Y*
- 12.83%
- 10Y*
- 15.14%
- ALL TIME*
- 14.78%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $3.82B | $3.78B | $5.44B | |
| $362.83M | $291.60M | $272.21M |
WST vs. VOO - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
WST West Pharmaceutical Services, Inc. | 24.21% | -15.73% | -6.75% | 49.97% | -49.70% | 65.88% | 89.05% | 54.13% | -0.08% | 17.02% |
VOO Vanguard S&P 500 ETF | 10.16% | 17.82% | 24.98% | 26.32% | -18.17% | 28.79% | 18.32% | 31.37% | -4.50% | 21.77% |
Correlation
The correlation between WST and VOO is 0.28, which is low. Their historical price movements had little consistent relationship.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.28 |
Correlation (3Y) Balances recent behavior with more history. | 0.35 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.48 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.48 |
Correlation (All Time) Calculated using the full available price history since Sep 9, 2010 | 0.54 |
Over the past year, the correlation between WST and VOO has dropped to 0.28 - well below their long-term average of 0.54, suggesting their price drivers have been diverging.
Compare stocks, funds, or ETFs
Search for stocks, ETFs, and funds for a quick comparison or use the comparison tool for more options.
Return for Risk
WST vs. VOO — Risk / Return Rank
WST
VOO
WST vs. VOO - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for West Pharmaceutical Services, Inc. (WST) and Vanguard S&P 500 ETF (VOO). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| WST | VOO | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.26 | ||
| Sortino ratioReturn per unit of downside risk | -0.15 | ||
| Omega ratioGain probability vs. loss probability | 1.25 | 1.28 | -0.02 |
| Calmar ratioReturn relative to maximum drawdown | 1.75 | 2.21 | -0.46 |
| Martin ratioReturn relative to average drawdown | 3.78 | 9.44 | -5.66 |
Loading charts...
Drawdowns
WST vs. VOO - Drawdown Comparison
The maximum WST drawdown since its inception was -59.29%, which is greater than VOO's maximum drawdown of -33.99%. Use the drawdown chart below to compare losses from any high point for WST and VOO.
Loading charts...
Drawdown Indicators
| WST | VOO | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -59.29% | -33.99% | -25.30% |
Max Drawdown (1Y)Largest decline over 1 year | -24.70% | -8.90% | -15.80% |
Max Drawdown (3Y)Largest decline over 3 years | -53.79% | -18.69% | -35.10% |
Max Drawdown (5Y)Largest decline over 5 years | -59.29% | -24.52% | -34.77% |
Max Drawdown (10Y)Largest decline over 10 years | -59.29% | -33.99% | -25.30% |
Current DrawdownCurrent decline from peak | -26.74% | -1.38% | -25.36% |
Average DrawdownAverage peak-to-trough decline | -16.92% | -3.67% | -13.25% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 11.41% | 2.08% | +9.33% |
Volatility
WST vs. VOO - Volatility Comparison
West Pharmaceutical Services, Inc. (WST) has a higher volatility of 9.56% compared to Vanguard S&P 500 ETF (VOO) at 3.54%. This indicates that WST's price experiences larger fluctuations and is considered to be riskier than VOO based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
Loading charts...
Volatility by Period
| WST | VOO | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 9.56% | 3.54% | +6.02% |
Volatility (6M)Calculated over the trailing 6-month period | 24.58% | 10.10% | +14.48% |
Volatility (1Y)Calculated over the trailing 1-year period | 34.01% | 12.82% | +21.19% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 40.73% | 16.93% | +23.80% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 34.73% | 18.01% | +16.72% |
Dividends
WST vs. VOO - Dividend Comparison
WST's dividend yield for the trailing twelve months is around 0.26%, less than VOO's 1.07% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
VOO Vanguard S&P 500 ETF | 1.07% | 1.13% | 1.24% | 1.46% | 1.69% | 1.25% | 1.54% | 1.88% | 2.06% | 1.78% | 2.02% | 2.10% |
WST West Pharmaceutical Services, Inc. | 0.26% | 0.31% | 0.25% | 0.22% | 0.31% | 0.15% | 0.23% | 0.41% | 0.58% | 0.54% | 0.58% | 0.75% |
Frequently Asked Questions
WST and VOO have a correlation of 0.28, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
WST has higher volatility (9.56%) compared to VOO (3.54%). In terms of maximum drawdown, WST dropped -59.29% vs VOO's -33.99%.
VOO currently has the higher Sharpe Ratio (1.53 vs 1.28), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.
Find the right allocation for WST and VOO
Add both to a portfolio and optimize allocations for your target — whether that's maximizing returns, minimizing drawdowns, or balancing risk across holdings.
Open Portfolio Optimizer