Acorn EnergyACFN +4.48%64 ROC (Joel Greenblatt) % is -39.28% as of Mar. 2026. GuruFocus rates ACFN with a GF Score™ of 64/100 and a GF Value™ of $13.60 (Modestly Overvalued). The stock has 4 warning signs investors should review. Among 2,493 Hardware companies, Acorn Energy ranks better than 94.75% on this metric.
Joel Greenblatt defined Return on Capital differently in his book The Little Book That Still Beats the Market (Little Books. Big Profits). He defines ROC (Joel Greenblatt) % as EBIT divided by the total of Property, Plant and Equipment and net working capital. Acorn Energy's annualized ROC (Joel Greenblatt) % for the quarter that ended in Mar. 2026 was -39.28%.
The historical rank and industry rank for Acorn Energy's ROC (Joel Greenblatt) % or its related term are showing as below:
ACFN'
s ROC (Joel Greenblatt) % Range Over the Past 10 Years
Min: -1326.42 Med: 6.8 Max: 295.73
Current: 103.17
During the past 13 years, Acorn Energy's highest ROC (Joel Greenblatt) % was 295.73%. The lowest was -1326.42%. And the median was 6.80%.
ACFN's ROC (Joel Greenblatt) % is ranked better than 94.75% of 2493
companies
in the Hardware industry
Industry Median: 10.35
vs ACFN: 103.17
Acorn Energy's 5-Year average Growth Rate of ROC (Joel Greenblatt) % was 0.00% per year.
Acorn Energy (NAS:ACFN) ROC (Joel Greenblatt) % Explanation
The way Joel Greenblatt defines Return on Capital is a more accurate measure of how efficiently the company generates returns onthe capital actually invested in the business. EBIT is used instead of net income because the tax and interest payment may be affected by factors other than the core business operation. Intangible assets are not included in the calculation because they don't need to be replaced.
Acorn Energy ROC (Joel Greenblatt) % Related Terms
Acorn Energy ROC (Joel Greenblatt) % Historical Data
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The historical data trend for Acorn Energy's ROC (Joel Greenblatt) % can be seen below:
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
ACFN vs LGL, ARAI, AATC: ROC (Joel Greenblatt) % Comparison
For the Scientific & Technical Instruments subindustry, Acorn Energy's ROC (Joel Greenblatt) %, along with its competitors' market caps and ROC (Joel Greenblatt) % data, can be viewed below:
* Competitive companies are chosen from companies within the same industry, with headquarter located in same country, with closest market capitalization; x-axis shows the market cap, and y-axis shows the term value; the bigger the dot, the larger the market cap. Note that "N/A" values will not show up in the chart.
Acorn Energy ROC (Joel Greenblatt) % vs Hardware Industry
For the Hardware industry and Technology sector, Acorn Energy's ROC (Joel Greenblatt) % distribution charts can be found below:
* The bar in red indicates where Acorn Energy's ROC (Joel Greenblatt) % falls into.
Joel Greenblatt defined Return on Capital differently in his book The Little Book That Still Beats the Market (Little Books. Big Profits) . He defines Return on Capital as follows:
EBIT stands for Earnings Before Interest and Taxes.
Fixed Assets are also known as non-current assets. They include the Property, Plant and Equipment that the firm needs in its operation.
GuruFocus calculates net working capital as: (Accounts Receivable + Total Inventories + Other Current Assets) - (Accounts Payable & Accrued Expense + Deferred Revenue + Other Current Liabilities). We're trying to account for OPERATING assets and liabilities (part of daily business) when calculating working capital. Cash and marketable securities are considered NON-OPERATING assets and are not included in calculation. We will also back out all interest bearing debt, short term debt and the portion of long term debt that is due in the current period from the current liabilities. This debt will be considered when computing cost of capital and it would be inappropriate to count it twice.
Note:
The EBIT data used here is four times the quarterly (Mar. 2026) EBIT data.
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
What does a ROC (Joel Greenblatt) % of -39.28% mean?
Acorn Energy (ACFN) has a ROC (Joel Greenblatt) % of -39.28% as of Mar. 2026. Joel Greenblatt's return on capital is the ratio of EBIT to average fixed assets and net working capital. View historical data on Acorn Energy and its competitors. According to the industry distribution chart, Acorn Energy ranks #131 out of 2493 companies in the Hardware industry, placing it in the top 5.3%.
Is Acorn Energy's ROC (Joel Greenblatt) % too high?
Acorn Energy's current ROC (Joel Greenblatt) % is -39.28%. Based on the distribution chart, Acorn Energy ranks #131 out of 2493 companies in the Hardware industry, which is in the top quartile — a strong position relative to peers. Overall, Acorn Energy has a GF Score™ of 64/100 and is considered Modestly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Acorn Energy's ROC (Joel Greenblatt) % compare to LGL and ARAI?
According to the Hardware industry distribution chart, Acorn Energy ranks #131 out of 2493 companies for ROC (Joel Greenblatt) %. This places Acorn Energy in the top 5% of its industry — outperforming the majority of peers. The industry median ROC (Joel Greenblatt) % is 10.35. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good ROC (Joel Greenblatt) % for a Hardware company?
The median ROC (Joel Greenblatt) % among Hardware companies is 10.35, based on 2,493 companies in the industry. Companies in the top quartile (top 25%) have a ROC (Joel Greenblatt) % significantly above this median, while those in the bottom quartile fall well below. However, ROC (Joel Greenblatt) % should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high ROC (Joel Greenblatt) % mean?
A high ROC (Joel Greenblatt) % can signal that a stock is expensive relative to its fundamentals. Joel Greenblatt's return on capital is the ratio of EBIT to average fixed assets and net working capital. View historical data on Acorn Energy and its competitors. For the Hardware industry, the median ROC (Joel Greenblatt) % is 10.35 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Acorn Energy's current ROC (Joel Greenblatt) % is -39.28%. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Acorn Energy stock overvalued right now?
Based on GuruFocus' analysis, Acorn Energy (ACFN) is currently considered Modestly Overvalued. The stock's GF Value™ is $13.60, compared to a current price of $17.25 — trading 26.8% above its estimated fair value. The current ROC (Joel Greenblatt) % is -39.28%. Acorn Energy's overall GF Score™ is 64/100 with 4 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is ROC (Joel Greenblatt) % calculated?
ROC (Joel Greenblatt) % is calculated from a company's financial statements. For Acorn Energy (ACFN), the current ROC (Joel Greenblatt) % is -39.28% as of Mar. 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.
Is Acorn Energy (ACFN) Overvalued in 2026?
Based on GuruFocus' analysis, Acorn Energy stock appears to be overvalued.
The current stock price of $17.25 is trading 26.8% above its estimated GF Value™ of $13.60.
GuruFocus considers Acorn Energy to be Modestly Overvalued.
Key valuation signals for ACFN:
ROC (Joel Greenblatt) %: -39.28%
GF Value™: $13.60 vs. price of $17.25 (26.8% above fair value)
No single metric tells the full story. See the ACFN stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Acorn Energy Inc is a holding company that focuses on technology-driven solutions for energy infrastructure asset management. The company operates through two segments namely, the PG segment and the CP segment. PG segment provides wireless remote monitoring and control systems and services for critical assets as well as Internet of Things applications which account for the majority of the revenue. CP segment is engaged in providing remote monitoring of cathodic protection systems on gas pipelines for gas utilities and pipeline companies.
64GF Score
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