Focused on building reliable datasets, financial models, and research tools for value-minded investors. Committed to turning complex data into practical guidance for value-investing and long-term wealth.
Dr. Charlie Tian is the founder and CEO of GuruFocus.com, a leading global investment research platform established in 2004. With a Ph.D. in physics, Dr. Tian transitioned from science to finance, applying a data-driven, disciplined approach to value investing.
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. CastleNet Technology's annualized ROC (Joel Greenblatt) % for the quarter that ended in Mar. 2026 was 77.20%.
The historical rank and industry rank for CastleNet Technology's ROC (Joel Greenblatt) % or its related term are showing as below:
ROCO:8059'
s ROC (Joel Greenblatt) % Range Over the Past 10 Years
Min: -75.18 Med: -13.49 Max: 7.16
Current: -23.58
During the past 13 years, CastleNet Technology's highest ROC (Joel Greenblatt) % was 7.16%. The lowest was -75.18%. And the median was -13.49%.
ROCO:8059's ROC (Joel Greenblatt) % is ranked worse than 84.99% of 2492
companies
in the Hardware industry
Industry Median: 10.35
vs ROCO:8059: -23.58
CastleNet Technology's 5-Year average Growth Rate of ROC (Joel Greenblatt) % was 0.00% 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.
CastleNet Technology ROC (Joel Greenblatt) % Related Terms
CastleNet Technology ROC (Joel Greenblatt) % Historical Data
* Premium members only.
The historical data trend for CastleNet Technology'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.
ROCO:8059 vs CSCO, MSI, HPE: ROC (Joel Greenblatt) % Comparison
For the Communication Equipment subindustry, CastleNet Technology'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.
CastleNet Technology ROC (Joel Greenblatt) % vs Hardware Industry
For the Hardware industry and Technology sector, CastleNet Technology's ROC (Joel Greenblatt) % distribution charts can be found below:
* The bar in red indicates where CastleNet Technology'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 77.20% mean?
CastleNet Technology (ROCO:8059) has a ROC (Joel Greenblatt) % of 77.20% 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 CastleNet Technology and its competitors. According to the industry distribution chart, CastleNet Technology ranks #2118 out of 2492 companies in the Hardware industry, placing it in the top 85%.
Is CastleNet Technology's ROC (Joel Greenblatt) % too high?
CastleNet Technology's current ROC (Joel Greenblatt) % is 77.20%. The Hardware industry median ROC (Joel Greenblatt) % is 10.35. CastleNet Technology's value of 77.20% is 645.9% above this industry median. Based on the distribution chart, CastleNet Technology ranks #2118 out of 2492 companies in the Hardware industry, which is in the bottom quartile relative to peers. Overall, CastleNet Technology has a GF Score™ of 51/100 and is considered Possible Value Trap, reflecting its overall financial health beyond just this single metric.
How does CastleNet Technology's ROC (Joel Greenblatt) % compare to CSCO and MSI?
According to the Hardware industry distribution chart, CastleNet Technology ranks #2118 out of 2492 companies for ROC (Joel Greenblatt) %. This places CastleNet Technology in the lower half of its industry. The industry median ROC (Joel Greenblatt) % is 10.35. CastleNet Technology's value of 77.20% is 645.9% above this benchmark. 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 2,492 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. CastleNet Technology's current ROC (Joel Greenblatt) % of 77.20% is 645.9% above the industry median. 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 CastleNet Technology 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. CastleNet Technology's current ROC (Joel Greenblatt) % is 77.20%. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is CastleNet Technology stock overvalued right now?
Based on GuruFocus' analysis, CastleNet Technology (ROCO:8059) is currently considered Possible Value Trap. The stock's GF Value™ is NT$441.35, compared to a current price of NT$15.10 — trading 96.6% below its estimated fair value. The current ROC (Joel Greenblatt) % is 77.20% and 645.9% above the Hardware industry median of 10.35. CastleNet Technology's overall GF Score™ is 51/100 with 7 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 CastleNet Technology (ROCO:8059), the current ROC (Joel Greenblatt) % is 77.20% 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 CastleNet Technology (ROCO:8059) Overvalued in 2026?
Based on GuruFocus' analysis, CastleNet Technology stock appears to be undervalued.
The current stock price of NT$15.10 is trading 96.6% below its estimated GF Value™ of NT$441.35.
GuruFocus considers CastleNet Technology to be Possible Value Trap.
Key valuation signals for ROCO:8059:
ROC (Joel Greenblatt) %: 77.20%
GF Value™: NT$441.35 vs. price of NT$15.10 (96.6% below fair value)
Industry Position: 645.9% above the Hardware median (#2118 of 2492)
No single metric tells the full story. See the ROCO:8059 stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
CastleNet Technology Inc is a manufacturer of network communication equipment in Taiwan. It is predominantly engaged in the manufacturing and selling of consumer electronics products such as broadband communications and digital home entertainment. It offers products like EMTA Gateway, Data Gateway, Data Modem, and WiFi Mesh System among others. Geographically, the company generates a majority of its revenue from America followed by Asia, Europe, and Oceania.
51GF Score
Get the complete analysis for ROCO:8059
ROC (Joel Greenblatt) % is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.
Quick Browse
Personalize
Premium Gurus 
Create New Portfolio
ROCO:8059 has been successfully added to your 
