WTS vs. ARM

Last updated Jun 4, 2026

WTS (Watts Water Technologies, Inc.) and ARM (Arm Holdings plc American Depositary Shares) are both stocks. WTS operates in Specialty Industrial Machinery (Industrials), while ARM operates in Semiconductors (Technology). Over the past year, WTS returned 31.59% vs 219.79% for ARM. At a 0.26 correlation, their price movements are largely independent.

Performance

WTS vs. ARM - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Watts Water Technologies, Inc. (WTS) and Arm Holdings plc American Depositary Shares (ARM). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, WTS achieves a 14.41% return, which is significantly lower than ARM's 276.75% return.

WTS

• 1D: 1.41%
• 1M: 8.75%
• YTD: 14.41%
• 6M: 14.85%
• 1Y: 31.59%
• 3Y*: 24.18%
• 5Y*: 18.38%
• 10Y*: 19.60%

ARM

• 1D: 2.26%
• 1M: 102.61%
• YTD: 276.75%
• 6M: 195.88%
• 1Y: 219.79%
• 3Y*: —
• 5Y*: —
• 10Y*: —

*Multi-year figures are annualized to reflect compound growth (CAGR)

WTS vs. ARM - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023
WTS Watts Water Technologies, Inc.	14.41%	36.85%	-1.62%	15.12%
ARM Arm Holdings plc American Depositary Shares	276.75%	-11.39%	64.16%	18.17%

Correlation

The correlation between WTS and ARM is 0.20, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.20
Correlation (All Time) Calculated using the full available price history since Sep 15, 2023	0.26

Fundamentals

Market Cap WTS : $10.54B ARM : $439.83B
EPS WTS : $10.95 ARM : $0.85
PE Ratio WTS : 28.75 ARM : 486.43
PEG Ratio WTS : 1.34 ARM : 16.69
PS Ratio WTS : 4.12 ARM : 89.38
PB Ratio WTS : 5.03 ARM : 53.08
Total Revenue (TTM) WTS : $2.56B ARM : $4.92B
Gross Profit (TTM) WTS : $1.26B ARM : $4.66B
EBITDA (TTM) WTS : $556.30M ARM : $1.37B

Return for Risk

WTS vs. ARM — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

WTS

WTS Risk / Return Rank: 76
WTS Sharpe Ratio Rank: 79
WTS Sortino Ratio Rank: 76
WTS Omega Ratio Rank: 73
WTS Calmar Ratio Rank: 75
WTS Martin Ratio Rank: 76

ARM

ARM Risk / Return Rank: 92
ARM Sharpe Ratio Rank: 95
ARM Sortino Ratio Rank: 93
ARM Omega Ratio Rank: 92
ARM Calmar Ratio Rank: 92
ARM Martin Ratio Rank: 88

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

WTS vs. ARM - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Watts Water Technologies, Inc. (WTS) and Arm Holdings plc American Depositary Shares (ARM). 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.

	WTS	ARM	Difference
Sharpe ratio Return per unit of total volatility	1.41	3.39	-1.98
Sortino ratio Return per unit of downside risk	2.09	3.81	-1.72
Omega ratio Gain probability vs. loss probability	1.25	1.48	-0.23
Calmar ratio Return relative to maximum drawdown	2.05	5.34	-3.28
Martin ratio Return relative to average drawdown	5.35	10.57	-5.22
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

WTS vs. ARM - Sharpe Ratio Comparison

The current WTS Sharpe Ratio is 1.41, which is lower than the ARM Sharpe Ratio of 3.39. The chart below compares the historical Sharpe Ratios of WTS and ARM, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	WTS	ARM	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.41	3.39	-1.98
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.67	—	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.70	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.34	1.32	-0.98

Drawdowns

WTS vs. ARM - Drawdown Comparison

The maximum WTS drawdown since its inception was -63.68%, which is greater than ARM's maximum drawdown of -53.97%. Use the drawdown chart below to compare losses from any high point for WTS and ARM.

Drawdown Indicators

	WTS	ARM	Difference
Max Drawdown Largest peak-to-trough decline	-63.68%	-53.97%	-9.71%
Max Drawdown (1Y) Largest decline over 1 year	-15.45%	-41.47%	+26.02%
Max Drawdown (3Y) Largest decline over 3 years	-19.54%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-44.08%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-44.08%	—	—
Current Drawdown Current decline from peak	-6.07%	0.00%	-6.07%
Average Drawdown Average peak-to-trough decline	-16.20%	-21.42%	+5.22%
Ulcer Index Depth and duration of drawdowns from previous peaks	5.92%	20.88%	-14.96%

Volatility

WTS vs. ARM - Volatility Comparison

The current volatility for Watts Water Technologies, Inc. (WTS) is 5.15%, while Arm Holdings plc American Depositary Shares (ARM) has a volatility of 33.02%. This indicates that WTS experiences smaller price fluctuations and is considered to be less risky than ARM based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	WTS	ARM	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.15%	33.02%	-27.87%
Volatility (6M) Calculated over the trailing 6-month period	16.30%	53.31%	-37.01%
Volatility (1Y) Calculated over the trailing 1-year period	22.55%	65.24%	-42.69%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	27.77%	75.37%	-47.60%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	28.22%	75.37%	-47.15%

Dividends

WTS vs. ARM - Dividend Comparison

WTS's dividend yield for the trailing twelve months is around 0.70%, while ARM has not paid dividends to shareholders.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ARM Arm Holdings plc American Depositary Shares	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
WTS Watts Water Technologies, Inc.	0.70%	0.72%	0.81%	0.66%	0.79%	0.52%	0.76%	0.90%	1.27%	0.99%	1.09%	1.33%

Financials

WTS vs. ARM - Profitability Comparison

The chart below illustrates the profitability comparison between Watts Water Technologies, Inc. and Arm Holdings plc American Depositary Shares over time, highlighting three key metrics: Gross Profit Margin, Operating Margin, and Net Profit Margin.

WTS - Gross Margin

Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jun 2026, Watts Water Technologies, Inc. reported a gross profit of 326.10M and revenue of 677.30M. Therefore, the gross margin over that period was 48.2%.

ARM - Gross Margin

Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jun 2026, Arm Holdings plc American Depositary Shares reported a gross profit of 1.39B and revenue of 1.49B. Therefore, the gross margin over that period was 93.1%.

WTS - Operating Margin

Operating margin is calculated as operating income divided by revenue. For the three months ending on Jun 2026, Watts Water Technologies, Inc. reported an operating income of 133.00M and revenue of 677.30M, resulting in an operating margin of 19.6%.

ARM - Operating Margin

Operating margin is calculated as operating income divided by revenue. For the three months ending on Jun 2026, Arm Holdings plc American Depositary Shares reported an operating income of 440.00M and revenue of 1.49B, resulting in an operating margin of 29.5%.

WTS - Net Margin

Net margin is calculated as net income divided by revenue. For the three months ending on Jun 2026, Watts Water Technologies, Inc. reported a net income of 99.60M and revenue of 677.30M, resulting in a net margin of 14.7%.

ARM - Net Margin

Net margin is calculated as net income divided by revenue. For the three months ending on Jun 2026, Arm Holdings plc American Depositary Shares reported a net income of 313.00M and revenue of 1.49B, resulting in a net margin of 21.0%.

Frequently Asked Questions

Can I hold both WTS and ARM in my portfolio?

WTS and ARM have a correlation of 0.20, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, WTS or ARM?

ARM has higher volatility (33.02%) compared to WTS (5.15%). In terms of maximum drawdown, WTS dropped -63.68% vs ARM's -53.97%.

Which has better risk-adjusted returns?

ARM currently has the higher Sharpe Ratio (3.39 vs 1.41), 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.