PDFS vs. WST
PDFS (PDF Solutions, Inc.) and WST (West Pharmaceutical Services, Inc.) are both stocks. PDFS operates in Software - Application (Technology), while WST operates in Medical Instruments & Supplies (Healthcare). Over the past 10 years, PDFS returned 9.57%/yr vs 15.86%/yr for WST. Their 0.30 correlation means their historical movements had little consistent relationship.
Performance
PDFS vs. WST - Performance Comparison
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Returns By Period
In the year-to-date period, PDFS achieves a 44.30% return, which is significantly higher than WST's 22.94% return. Over the past 10 years, PDFS has underperformed WST with an annualized return of 9.57%, while WST has yielded a comparatively higher 15.86% annualized return.
PDFS
- 1D
- -7.67%
- 1M
- -37.55%
- 6M
- 19.47%
- YTD
- 44.30%
- 1Y
- 69.91%
- 3Y*
- -3.67%
- 5Y*
- 17.09%
- 10Y*
- 9.57%
- ALL TIME*
- 4.19%
WST
- 1D
- 0.20%
- 1M
- -4.79%
- 6M
- 43.26%
- YTD
- 22.94%
- 1Y
- 33.94%
- 3Y*
- -2.34%
- 5Y*
- -3.65%
- 10Y*
- 15.86%
- ALL TIME*
- 11.68%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $24.29M | $33.61M | $43.73M | |
| $352.81M | $297.00M | $271.01M |
PDFS vs. WST - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
PDFS PDF Solutions, Inc. | 44.30% | 5.35% | -15.74% | 12.69% | -10.29% | 47.18% | 27.89% | 100.36% | -46.31% | -30.38% |
WST West Pharmaceutical Services, Inc. | 22.94% | -15.73% | -6.75% | 49.97% | -49.70% | 65.88% | 89.05% | 54.13% | -0.08% | 17.02% |
Correlation
The correlation between PDFS and WST is 0.25, which is low. Their historical price movements had little consistent relationship.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.25 |
Correlation (3Y) Balances recent behavior with more history. | 0.27 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.33 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.31 |
Correlation (All Time) Calculated using the full available price history since Jul 31, 2001 | 0.30 |
Fundamentals
PDFS:
$1.72B
WST:
$23.75B
PDFS:
$0.18
WST:
$7.82
PDFS:
228.35
WST:
43.18
PDFS:
7.09
WST:
7.33
PDFS:
5.93
WST:
8.05
PDFS:
$231.38M
WST:
$3.33B
PDFS:
$167.77M
WST:
$1.22B
PDFS:
$23.76M
WST:
$824.20M
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Return for Risk
PDFS vs. WST — Risk / Return Rank
PDFS
WST
PDFS vs. WST - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for PDF Solutions, Inc. (PDFS) and West Pharmaceutical Services, Inc. (WST). 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.
| PDFS | WST | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.09 | ||
| Sortino ratioReturn per unit of downside risk | +0.07 | ||
| Omega ratioGain probability vs. loss probability | 1.21 | 1.20 | +0.01 |
| Calmar ratioReturn relative to maximum drawdown | 1.68 | 1.38 | +0.30 |
| Martin ratioReturn relative to average drawdown | 6.02 | 2.98 | +3.04 |
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Drawdowns
PDFS vs. WST - Drawdown Comparison
The maximum PDFS drawdown since its inception was -95.46%, which is greater than WST's maximum drawdown of -59.29%. Use the drawdown chart below to compare losses from any high point for PDFS and WST.
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Drawdown Indicators
| PDFS | WST | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -95.46% | -59.29% | -36.17% |
Max Drawdown (1Y)Largest decline over 1 year | -41.84% | -24.70% | -17.14% |
Max Drawdown (3Y)Largest decline over 3 years | -64.32% | -53.79% | -10.53% |
Max Drawdown (5Y)Largest decline over 5 years | -65.53% | -59.29% | -6.24% |
Max Drawdown (10Y)Largest decline over 10 years | -68.00% | -59.29% | -8.71% |
Current DrawdownCurrent decline from peak | -41.84% | -27.49% | -14.35% |
Average DrawdownAverage peak-to-trough decline | -43.90% | -16.91% | -26.99% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 12.26% | 11.46% | +0.80% |
Volatility
PDFS vs. WST - Volatility Comparison
PDF Solutions, Inc. (PDFS) has a higher volatility of 25.77% compared to West Pharmaceutical Services, Inc. (WST) at 9.81%. This indicates that PDFS's price experiences larger fluctuations and is considered to be riskier than WST based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| PDFS | WST | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 25.77% | 9.81% | +15.96% |
Volatility (6M)Calculated over the trailing 6-month period | 53.27% | 24.73% | +28.54% |
Volatility (1Y)Calculated over the trailing 1-year period | 64.62% | 34.10% | +30.52% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 50.24% | 40.75% | +9.49% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 47.16% | 34.74% | +12.42% |
Dividends
PDFS vs. WST - Dividend Comparison
PDFS has not paid dividends to shareholders, while WST's dividend yield for the trailing twelve months is around 0.32%.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
PDFS PDF Solutions, Inc. | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
WST West Pharmaceutical Services, Inc. | 0.32% | 0.31% | 0.25% | 0.22% | 0.31% | 0.15% | 0.23% | 0.41% | 0.58% | 0.54% | 0.58% | 0.75% |
Financials
PDFS vs. WST - Financials Comparison
This section allows you to compare key financial metrics between PDF Solutions, Inc. and West Pharmaceutical Services, Inc.. You can select fields from income statements, balance sheets, and cash flow statements to easily visualize and compare the financial health of both companies.
Total Revenue: Total amount of money received from sales and other business activities
PDFS vs. WST - Profitability Comparison
PDFS - Gross Margin
Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jul 2026, PDF Solutions, Inc. reported a gross profit of 43.19M and revenue of 60.13M. Therefore, the gross margin over that period was 71.8%.
WST - Gross Margin
Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jul 2026, West Pharmaceutical Services, Inc. reported a gross profit of 329.20M and revenue of 872.30M. Therefore, the gross margin over that period was 37.7%.
PDFS - Operating Margin
Operating margin is calculated as operating income divided by revenue. For the three months ending on Jul 2026, PDF Solutions, Inc. reported an operating income of 6.31M and revenue of 60.13M, resulting in an operating margin of 10.5%.
WST - Operating Margin
Operating margin is calculated as operating income divided by revenue. For the three months ending on Jul 2026, West Pharmaceutical Services, Inc. reported an operating income of 179.10M and revenue of 872.30M, resulting in an operating margin of 20.5%.
PDFS - Net Margin
Net margin is calculated as net income divided by revenue. For the three months ending on Jul 2026, PDF Solutions, Inc. reported a net income of 4.79M and revenue of 60.13M, resulting in a net margin of 8.0%.
WST - Net Margin
Net margin is calculated as net income divided by revenue. For the three months ending on Jul 2026, West Pharmaceutical Services, Inc. reported a net income of 154.00M and revenue of 872.30M, resulting in a net margin of 17.7%.
Frequently Asked Questions
PDFS and WST have a correlation of 0.25, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
PDFS has higher volatility (25.77%) compared to WST (9.81%). In terms of maximum drawdown, PDFS dropped -95.46% vs WST's -59.29%.
PDFS currently has the higher Sharpe Ratio (1.09 vs 1.00), 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.
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