ROK vs. PH
ROK (Rockwell Automation, Inc.) and PH (Parker-Hannifin Corporation) are both stocks. Both operate in the Specialty Industrial Machinery industry within the Industrials sector. Over the past 10 years, ROK returned 17.75%/yr vs 26.60%/yr for PH. A 0.51 correlation means they provide meaningful diversification when combined.
Performance
ROK vs. PH - Performance Comparison
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Returns By Period
In the year-to-date period, ROK achieves a 23.68% return, which is significantly higher than PH's 9.92% return. Over the past 10 years, ROK has underperformed PH with an annualized return of 17.75%, while PH has yielded a comparatively higher 26.60% annualized return.
ROK
- 1D
- 0.91%
- 1M
- 5.70%
- YTD
- 23.68%
- 6M
- 20.73%
- 1Y
- 50.86%
- 3Y*
- 17.07%
- 5Y*
- 12.71%
- 10Y*
- 17.75%
PH
- 1D
- 0.93%
- 1M
- 10.98%
- YTD
- 9.92%
- 6M
- 8.98%
- 1Y
- 48.68%
- 3Y*
- 38.98%
- 5Y*
- 28.29%
- 10Y*
- 26.60%
ROK vs. PH - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
ROK Rockwell Automation, Inc. | 23.68% | 38.36% | -6.23% | 22.63% | -24.78% | 41.21% | 26.17% | 37.85% | -21.79% | 48.87% |
PH Parker-Hannifin Corporation | 9.92% | 39.54% | 39.58% | 60.81% | -6.91% | 18.30% | 34.78% | 40.75% | -24.00% | 44.91% |
Correlation
The correlation between ROK and PH is 0.66, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.66 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.66 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.68 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.71 |
Correlation (All Time) Calculated using the full available price history since Jan 2, 1987 | 0.51 |
The correlation between ROK and PH shifts across timeframes, from 0.51 (all time) to 0.71 (10 years), reflecting how their relationship changes across market environments.
Fundamentals
ROK:
$53.83B
PH:
$123.15B
ROK:
$9.63
PH:
$27.11
ROK:
49.62
PH:
35.49
ROK:
6.13
PH:
5.89
ROK:
15.28
PH:
7.91
ROK:
$8.80B
PH:
$20.99B
ROK:
$4.63B
PH:
$7.81B
ROK:
$1.56B
PH:
$5.31B
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Return for Risk
ROK vs. PH — Risk / Return Rank
ROK
PH
ROK vs. PH - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Rockwell Automation, Inc. (ROK) and Parker-Hannifin Corporation (PH). 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.
| ROK | PH | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.19 | ||
| Sortino ratioReturn per unit of downside risk | -0.29 | ||
| Omega ratioGain probability vs. loss probability | 1.31 | 1.34 | -0.03 |
| Calmar ratioReturn relative to maximum drawdown | 2.73 | 2.53 | +0.20 |
| Martin ratioReturn relative to average drawdown | 8.62 | 7.40 | +1.22 |
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Drawdowns
ROK vs. PH - Drawdown Comparison
The maximum ROK drawdown since its inception was -75.83%, which is greater than PH's maximum drawdown of -66.92%. Use the drawdown chart below to compare losses from any high point for ROK and PH.
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Drawdown Indicators
| ROK | PH | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -75.83% | -66.92% | -8.91% |
Max Drawdown (1Y)Largest decline over 1 year | -18.73% | -19.34% | +0.61% |
Max Drawdown (3Y)Largest decline over 3 years | -34.84% | -26.79% | -8.05% |
Max Drawdown (5Y)Largest decline over 5 years | -45.09% | -28.64% | -16.45% |
Max Drawdown (10Y)Largest decline over 10 years | -45.09% | -54.68% | +9.59% |
Current DrawdownCurrent decline from peak | 0.00% | -5.74% | +5.74% |
Average DrawdownAverage peak-to-trough decline | -14.86% | -15.32% | +0.46% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 5.92% | 6.60% | -0.68% |
Volatility
ROK vs. PH - Volatility Comparison
Rockwell Automation, Inc. (ROK) has a higher volatility of 9.01% compared to Parker-Hannifin Corporation (PH) at 7.45%. This indicates that ROK's price experiences larger fluctuations and is considered to be riskier than PH based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| ROK | PH | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 9.01% | 7.45% | +1.56% |
Volatility (6M)Calculated over the trailing 6-month period | 23.94% | 19.01% | +4.93% |
Volatility (1Y)Calculated over the trailing 1-year period | 29.15% | 25.13% | +4.02% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 31.80% | 28.64% | +3.16% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 31.52% | 31.73% | -0.21% |
Dividends
ROK vs. PH - Dividend Comparison
ROK's dividend yield for the trailing twelve months is around 1.14%, more than PH's 0.77% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
PH Parker-Hannifin Corporation | 0.77% | 0.80% | 1.00% | 1.25% | 1.73% | 1.25% | 1.29% | 1.65% | 1.97% | 1.32% | 1.80% | 2.60% |
ROK Rockwell Automation, Inc. | 1.14% | 1.36% | 1.77% | 1.54% | 1.76% | 1.24% | 1.65% | 1.94% | 2.42% | 1.59% | 2.18% | 2.61% |
Financials
ROK vs. PH - Financials Comparison
This section allows you to compare key financial metrics between Rockwell Automation, Inc. and Parker-Hannifin Corporation. 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
ROK vs. PH - Profitability Comparison
ROK - Gross Margin
Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jun 2026, Rockwell Automation, Inc. reported a gross profit of 1.13B and revenue of 2.24B. Therefore, the gross margin over that period was 50.3%.
PH - Gross Margin
Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jun 2026, Parker-Hannifin Corporation reported a gross profit of 2.02B and revenue of 5.49B. Therefore, the gross margin over that period was 36.8%.
ROK - Operating Margin
Operating margin is calculated as operating income divided by revenue. For the three months ending on Jun 2026, Rockwell Automation, Inc. reported an operating income of 467.00M and revenue of 2.24B, resulting in an operating margin of 20.9%.
PH - Operating Margin
Operating margin is calculated as operating income divided by revenue. For the three months ending on Jun 2026, Parker-Hannifin Corporation reported an operating income of 1.13B and revenue of 5.49B, resulting in an operating margin of 20.7%.
ROK - Net Margin
Net margin is calculated as net income divided by revenue. For the three months ending on Jun 2026, Rockwell Automation, Inc. reported a net income of 350.00M and revenue of 2.24B, resulting in a net margin of 15.6%.
PH - Net Margin
Net margin is calculated as net income divided by revenue. For the three months ending on Jun 2026, Parker-Hannifin Corporation reported a net income of 904.00M and revenue of 5.49B, resulting in a net margin of 16.5%.
Frequently Asked Questions
ROK and PH have a correlation of 0.66, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
ROK has higher volatility (9.01%) compared to PH (7.45%). In terms of maximum drawdown, ROK dropped -75.83% vs PH's -66.92%.
PH currently has the higher Sharpe Ratio (1.95 vs 1.76), 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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