Ruentex Development Co (TPE:9945) Operating Income: NT$6,946 Mil (TTM As of Dec. 2025)

Ruentex Development Co  (TPE:9945) Operating Income Explanation

1. Operating Income or EBIT is linked to Return on Capital for both regular definition and Joel Greenblatt's definition.

Ruentex Development Co's annualized ROC % for the quarter that ended in Dec. 2025 is calculated as:

where

Note: The Operating Income data used here is four times the quarterly (Dec. 2025) data.

2. Joel Greenblatt's definition of Return on Capital:

Ruentex Development Co's annualized ROC (Joel Greenblatt) % for the quarter that ended in Dec. 2025 is calculated as:

where Working Capital is:

When net working capital is negative, 0 is used.

Note: The EBIT data used here is four times the quarterly (Dec. 2025) EBIT data.

3. Operating Income is also linked to Operating Margin %:

Ruentex Development Co's Operating Margin % for the quarter that ended in Dec. 2025 is calculated as:

* 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.

4. Please click Growth Rate Calculation Example (GuruFocus) to see how GuruFocus calculates Wal-Mart Stores Inc (WMT)'s revenue growth rate. You can apply the same method to get the Operating Income growth rate using Operating Income per share data.

Be Aware

Compared with a company's EBITDA margin, Operating Margin can be manipulated by adjusting the rate of depreciation, depletion and amortization (DDA).

If a company is facing competition, its Operating Margin may decline. Often the Operating Margin declines well before the company's revenue or even profit decline. Therefore, Operating Margin is a very important indicator of whether the company is facing problems.

For instance, by 2012, Nokia (NOK)'s problems were well known and its stock had lost more than 90% of its market value since 2007. But Nokia's Operating Margin had already been in decline since 2002, although its earnings per share were still rising. Investors who paid attention to Operating Margin would have avoided this huge loss. The same can be said for Research-in-Motion (RIMM).

Therefore, Operating Margin is a very important screening filter for GuruFocus. GuruFocus's Buffett-Munger screener requires that the profit margin is either consistent or expanding. The Model Portfolio of the Buffett-Munger screener has outperformed the market every year since inception in 2009.

Ruentex Development Co Operating Income Related Terms

The historical data trend for Ruentex Development Co's Operating Income 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.

Ruentex Development Co Operating Income Chart

Ruentex Development Co Annual Data
	Trend	Dec16	Dec17	Dec18	Dec19	Dec20	Dec21	Dec22	Dec23	Dec24	Dec25
Operating Income		Get a 7-Day Free Trial					4,070.46	5,024.77	5,020.00	6,299.76	6,945.66

Ruentex Development Co Quarterly Data
	Mar21	Jun21	Sep21	Dec21	Mar22	Jun22	Sep22	Dec22	Mar23	Jun23	Sep23	Dec23	Mar24	Jun24	Sep24	Dec24	Mar25	Jun25	Sep25	Dec25
Operating Income	Get a 7-Day Free Trial															2,073.35	1,117.08	1,670.34	1,621.46	2,536.78

Ruentex Development Co Operating Income Calculation

Operating Income, is the profit a company earned through operations. All expenses, including cash expenses such as cost of goods sold (COGS), research & development, wages, and non-cash expenses, such as depreciation, depletion and amortization, have been deducted from the sales.

Operating Income for the trailing twelve months (TTM) ended in Dec. 2025 adds up the quarterly data reported by the company within the most recent 12 months, which was NT$6,946 Mil.

* 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.

Ruentex Development Co Business Description