ACFN vs. RNMBY

Last updated Jun 23, 2026

ACFN (Acorn Energy, Inc.) and RNMBY (Rheinmetall AG ADR) are both stocks. ACFN operates in Scientific & Technical Instruments (Technology), while RNMBY operates in Aerospace & Defense (Industrials). At a 0.18 correlation, their price movements are largely independent.

Performance

ACFN vs. RNMBY - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Acorn Energy, Inc. (ACFN) and Rheinmetall AG ADR (RNMBY). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ACFN achieves a 8.15% return, which is significantly higher than RNMBY's -25.08% return.

ACFN

• 1D: 0.18%
• 1M: -6.47%
• YTD: 8.15%
• 6M: 8.79%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

RNMBY

• 1D: 0.28%
• 1M: -4.44%
• YTD: -25.08%
• 6M: -24.49%
• 1Y: -32.00%
• 3Y*: 70.94%
• 5Y*: 70.56%
• 10Y*: 37.93%

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

ACFN vs. RNMBY - Yearly Performance Comparison

	2026 (YTD)	2025
ACFN Acorn Energy, Inc.	8.15%	-18.38%
RNMBY Rheinmetall AG ADR	-25.08%	-12.96%

Correlation

The correlation between ACFN and RNMBY is 0.18, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (All Time) Calculated using the full available price history since Jul 24, 2025	0.18

Fundamentals

Market Cap ACFN : $40.92M RNMBY : $63.24B
EPS ACFN : $0.78 RNMBY : €3.56
PE Ratio ACFN : 21.01 RNMBY : 66.29
PEG Ratio ACFN : 0.02 RNMBY : 3.03
PS Ratio ACFN : 3.90 RNMBY : 4.99
PB Ratio ACFN : 4.88 RNMBY : 10.32
Total Revenue (TTM) ACFN : $10.61M RNMBY : €9.58B
Gross Profit (TTM) ACFN : $8.27M RNMBY : €4.12B
EBITDA (TTM) ACFN : $1.38M RNMBY : €1.81B

Return for Risk

ACFN vs. RNMBY — Risk / Return Rank

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

ACFN

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

RNMBY

RNMBY Risk / Return Rank: 12
RNMBY Sharpe Ratio Rank: 12
RNMBY Sortino Ratio Rank: 14
RNMBY Omega Ratio Rank: 15
RNMBY Calmar Ratio Rank: 14
RNMBY Martin Ratio Rank: 5

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.

ACFN vs. RNMBY - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Acorn Energy, Inc. (ACFN) and Rheinmetall AG ADR (RNMBY). 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.

	ACFN	RNMBY	Difference
Sharpe ratio: Return per unit of total volatility	—	-0.70	—
Sortino ratio: Return per unit of downside risk	—	-0.84	—
Omega ratio: Gain probability vs. loss probability	—	0.90	—
Calmar ratio: Return relative to maximum drawdown	—	-0.73	—
Martin ratio: Return relative to average drawdown	—	-1.51	—

Drawdowns

ACFN vs. RNMBY - Drawdown Comparison

The maximum ACFN drawdown since its inception was -58.11%, smaller than the maximum RNMBY drawdown of -67.75%. Use the drawdown chart below to compare losses from any high point for ACFN and RNMBY.

Drawdown Indicators

	ACFN	RNMBY	Difference
Max Drawdown Largest peak-to-trough decline	-58.11%	-67.75%	+9.64%
Max Drawdown (1Y) Largest decline over 1 year	—	-44.06%	—
Max Drawdown (3Y) Largest decline over 3 years	—	-44.06%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-44.06%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-67.75%	—
Current Drawdown Current decline from peak	-46.60%	-41.49%	-5.11%
Average Drawdown Average peak-to-trough decline	-32.33%	-16.77%	-15.56%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	21.19%	—

Volatility

Volatility by Period

	ACFN	RNMBY	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	10.70%	—
Volatility (6M) Calculated over the trailing 6-month period	—	33.58%	—
Volatility (1Y) Calculated over the trailing 1-year period	91.08%	45.77%	+45.31%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	91.08%	44.83%	+46.25%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	91.08%	41.52%	+49.56%

Dividends

ACFN vs. RNMBY - Dividend Comparison

ACFN has not paid dividends to shareholders, while RNMBY's dividend yield for the trailing twelve months is around 1.00%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACFN Acorn Energy, 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%
RNMBY Rheinmetall AG ADR	1.00%	0.49%	0.96%	1.46%	1.82%	1.72%	1.56%	1.36%	1.47%	2.06%	2.97%	0.53%

Financials

ACFN vs. RNMBY - Profitability Comparison

The chart below illustrates the profitability comparison between Acorn Energy, Inc. and Rheinmetall AG ADR over time, highlighting three key metrics: Gross Profit Margin, Operating Margin, and Net Profit Margin.

ACFN - Gross Margin

Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jun 2026, Acorn Energy, Inc. reported a gross profit of 1.79M and revenue of 2.23M. Therefore, the gross margin over that period was 80.2%.

RNMBY - Gross Margin

Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jun 2026, Rheinmetall AG ADR reported a gross profit of 430.97M and revenue of 1.97B. Therefore, the gross margin over that period was 21.9%.

ACFN - Operating Margin

Operating margin is calculated as operating income divided by revenue. For the three months ending on Jun 2026, Acorn Energy, Inc. reported an operating income of -129.00K and revenue of 2.23M, resulting in an operating margin of -5.8%.

RNMBY - Operating Margin

Operating margin is calculated as operating income divided by revenue. For the three months ending on Jun 2026, Rheinmetall AG ADR reported an operating income of 178.89M and revenue of 1.97B, resulting in an operating margin of 9.1%.

ACFN - Net Margin

Net margin is calculated as net income divided by revenue. For the three months ending on Jun 2026, Acorn Energy, Inc. reported a net income of -77.00K and revenue of 2.23M, resulting in a net margin of -3.5%.

RNMBY - Net Margin

Net margin is calculated as net income divided by revenue. For the three months ending on Jun 2026, Rheinmetall AG ADR reported a net income of 112.83M and revenue of 1.97B, resulting in a net margin of 5.7%.

Frequently Asked Questions

Can I hold both ACFN and RNMBY in my portfolio?

ACFN and RNMBY have a correlation of 0.18, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.