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. Rainbow Rare Earths's annualized ROC (Joel Greenblatt) % for the quarter that ended in Dec. 2025 was -62.16%.
The historical rank and industry rank for Rainbow Rare Earths's ROC (Joel Greenblatt) % or its related term are showing as below:
RBWRF'
s ROC (Joel Greenblatt) % Range Over the Past 10 Years
Min: -148.42 Med: -31.56 Max: -15.65
Current: -36.83
During the past 12 years, Rainbow Rare Earths's highest ROC (Joel Greenblatt) % was -15.65%. The lowest was -148.42%. And the median was -31.56%.
RBWRF's ROC (Joel Greenblatt) % is ranked worse than 58% of 2495
companies
in the Metals & Mining industry
Industry Median: -22.69
vs RBWRF: -36.83
Rainbow Rare Earths's 5-Year average Growth Rate of ROC (Joel Greenblatt) % was -0.80% per year.
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.
Rainbow Rare Earths ROC (Joel Greenblatt) % Related Terms
Rainbow Rare Earths ROC (Joel Greenblatt) % Historical Data
* Premium members only.
The historical data trend for Rainbow Rare Earths'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.
For the Other Industrial Metals & Mining subindustry, Rainbow Rare Earths'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.
Rainbow Rare Earths ROC (Joel Greenblatt) % vs Metals & Mining Industry
For the Metals & Mining industry and Basic Materials sector, Rainbow Rare Earths's ROC (Joel Greenblatt) % distribution charts can be found below:
* The bar in red indicates where Rainbow Rare Earths'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 two times the semi-annual (Dec. 2025) 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 -62.16% mean?
Rainbow Rare Earths (RBWRF) has a ROC (Joel Greenblatt) % of -62.16% as of Dec. 2025. Joel Greenblatt's return on capital is the ratio of EBIT to average fixed assets and net working capital. View historical data on Rainbow Rare Earths and its competitors. According to the industry distribution chart, Rainbow Rare Earths ranks #1447 out of 2495 companies in the Metals & Mining industry, placing it in the top 58%.
Is Rainbow Rare Earths' ROC (Joel Greenblatt) % too high?
Rainbow Rare Earths' current ROC (Joel Greenblatt) % is -62.16%. Based on the distribution chart, Rainbow Rare Earths ranks #1447 out of 2495 companies in the Metals & Mining industry, which is below the industry midpoint. Overall, Rainbow Rare Earths has a GF Score™ of 21/100 and is considered Fairly Valued, reflecting its overall financial health beyond just this single metric.
How does Rainbow Rare Earths' ROC (Joel Greenblatt) % compare to competitors?
According to the Metals & Mining industry distribution chart, Rainbow Rare Earths ranks #1447 out of 2495 companies for ROC (Joel Greenblatt) %. This places Rainbow Rare Earths in the lower half of its industry. 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 Metals & Mining company?
A good ROC (Joel Greenblatt) % depends on the Metals & Mining industry context. 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 Rainbow Rare Earths and its competitors. Rainbow Rare Earths's current ROC (Joel Greenblatt) % is -62.16%. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Rainbow Rare Earths stock overvalued right now?
Based on GuruFocus' analysis, Rainbow Rare Earths (RBWRF) is currently considered Fairly Valued. The stock's GF Value™ is $0.21, compared to a current price of $0.31 — trading 47.6% above its estimated fair value. The current ROC (Joel Greenblatt) % is -62.16%. Rainbow Rare Earths' overall GF Score™ is 21/100 with 3 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 Rainbow Rare Earths (RBWRF), the current ROC (Joel Greenblatt) % is -62.16% as of Dec. 2025. 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 Rainbow Rare Earths (RBWRF) Overvalued in 2026?
Based on GuruFocus' analysis, Rainbow Rare Earths stock appears to be overvalued.
The current stock price of $0.31 is trading 47.6% above its estimated GF Value™ of $0.21.
GuruFocus considers Rainbow Rare Earths to be Fairly Valued.
Key valuation signals for RBWRF:
ROC (Joel Greenblatt) %: -62.16%
GF Value™: $0.21 vs. price of $0.31 (47.6% above fair value)
No single metric tells the full story. See the RBWRF stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Rainbow Rare Earths Ltd is focused on the development of an independent and ethical supply chain of the rare earth elements that are driving the green energy transition. The company is advancing two projects, Phalaborwa in South Africa and Uberaba in Brazil, which are intended to produce rare earth elements for industrial, energy, and defence applications.
21GF Score
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ROC (Joel Greenblatt) % is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.
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