LuxNet (ROCO:4979) E10: NT$-1.27 (As of Dec. 2025)

Author: Vera Yuan Vera Yuan
Vera Yuan
Vera Yuan
Director of Data and Quant Analytics at GuruFocus
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.
Reviewed by: Charlie Tian Charlie Tian
Charlie Tian
Charlie Tian
Founder & CEO of GuruFocus
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.

ROCO:4979 LuxNet Corp ROCO:4979
61 GF Score
Price NT$410.00
GF Value NT$261.95
Valuation Significantly Overvalued
! 1 Warning Sign
View Full Analysis

What is LuxNet E10?

LuxNet ROCO:4979 +1.74% 61 E10 is NT$-1.27 as of Dec. 2025. GuruFocus rates ROCO:4979 with a GF Score™ of 61/100 and a GF Value™ of NT$261.95 (Significantly Overvalued). The stock has 1 warning sign investors should review.

E10 is a concept invented by Prof. Robert Shiller, who uses E10 for his Shiller P/E calculation. E10 is the average of the inflation adjusted earnings of a company over the past 10 years.

LuxNet's adjusted earnings per share data for the three months ended in Dec. 2025 was NT$1.640. Add all the adjusted EPS for the past 10 years together and divide 10 will get our e10, which is NT$-1.27 for the trailing ten years ended in Dec. 2025.

During the past 3 years, the average E10 Growth Rate was -13.00% per year. During the past 5 years, the average E10 Growth Rate was -23.10% per year. 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 E10 growth rate using E10 data.

During the past 13 years, the highest 3-Year average E10 Growth Rate of LuxNet was -5.40% per year. The lowest was -35.20% per year. And the median was -13.00% per year.

As of today (2026-07-16), LuxNet's current stock price is NT$410.00. LuxNet's E10 for the quarter that ended in Dec. 2025 was NT$-1.27. LuxNet's Shiller PE Ratio of today is .


LuxNet  (ROCO:4979) E10 Explanation

If a company grows much fast than inflation, E10 may underestimate the company's earnings power. Shiller PE Ratio can seem to be too high even the actual P/E is low.

For the Shiller P/E, the earnings of the past 10 years are inflation-adjusted and averaged. The result is used for P/E calculation. Since it looks at the average over the last 10 years, the Shiller P/E is also called PE10.

The Shiller P/E was first used by professor Robert Shiller to measure the valuation of the overall market. The same calculation is applied here to individual companies.


Be Aware

Shiller PE Ratio works better for cyclical companies. It gives you a better idea on the company's real earnings power.


LuxNet E10 Related Terms


LuxNet E10 Historical Data

* Premium members only.

The historical data trend for LuxNet's E10 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.

LuxNet E10 Chart

LuxNet Annual Data
Trend Dec16 Dec17 Dec18 Dec19 Dec20 Dec21 Dec22 Dec23 Dec24 Dec25
E10
Get a 7-Day Free Trial Premium Member Only Premium Member Only -0.70 -0.88 -0.79 -0.82 -1.27

LuxNet Quarterly Data
Mar21 Jun21 Sep21 Dec21 Mar22 Jun22 Sep22 Dec22 Mar23 Jun23 Sep23 Dec23 Mar24 Jun24 Sep24 Dec24 Mar25 Jun25 Sep25 Dec25
E10 Get a 7-Day Free Trial Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only -0.82 -0.83 -0.96 -1.14 -1.27

ROCO:4979 vs NVDA, AVGO, MU: E10 Comparison

For the Semiconductors subindustry, LuxNet's Shiller PE Ratio, along with its competitors' market caps and Shiller PE Ratio 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.


LuxNet Shiller PE Ratio vs Semiconductors Industry

For the Semiconductors industry and Technology sector, LuxNet's Shiller PE Ratio distribution charts can be found below:

* The bar in red indicates where LuxNet's Shiller PE Ratio falls into.


ROCO:4979
61GF Score
LuxNet Corp ROCO:4979
E10 is just one metric. See GF Score™, valuation, warning signs, and more.
View Full Analysis

LuxNet E10 Calculation

E10 is a concept invented by Prof. Robert Shiller, who uses E10 for his Shiller P/E calculation. When we calculate the today's Shiller P/E ratio of a stock, we use today's price divided by E10.

What is E10? How do we calculate E10?

E10 is the average of the inflation adjusted earnings of a company over the past 10 years. Let's use an example to explain.

If we want to calculate the E10 of Wal-Mart (WMT) for Dec. 31, 2010, we need to have the inflation data and the earnings from 2001 through 2010.

We adjusted the earnings of 2001 earnings data with the total inflation from 2001 through 2010 to the equivalent earnings in 2010. If the total inflation from 2001 to 2010 is 40%, and Wal-Mart earned $1 a share in 2001, then the 2001's equivalent earnings in 2010 is $1.4 a share. If Wal-Mart earns $1 again in 2002, and the total inflation from 2002 through 2010 is 35%, then the equivalent 2002 earnings in 2010 is $1.35. So on and so forth, you get the equivalent earnings of past 10 years. Then you add them together and divided the sum by 10 to get E10.

Please note that we use the CPI data of the country/region where the company is headquartered. If the CPI data for that country/region is not available, then we will use the CPI data of the United States as default.

For example, LuxNet's adjusted earnings per share data for the three months ended in Dec. 2025 was:

Adj_EPS= Earnings per Share (Diluted) /CPI of Dec. 2025 (Change)*Current CPI (Dec. 2025)
=1.64/324.0540*324.0540
=1.640

Current CPI (Dec. 2025) = 324.0540.

LuxNet Quarterly Data

per share eps CPI Adj_EPS
201603 1.164 238.132 1.584
201606 -0.495 241.018 -0.666
201609 -1.368 241.428 -1.836
201612 -0.970 241.432 -1.302
201703 -2.051 243.801 -2.726
201706 -1.982 244.955 -2.622
201709 -1.367 246.819 -1.795
201712 -2.549 246.524 -3.351
201803 -1.201 249.554 -1.560
201806 -1.621 251.989 -2.085
201809 -0.752 252.439 -0.965
201812 -3.314 251.233 -4.275
201903 -0.228 254.202 -0.291
201906 -0.486 256.143 -0.615
201909 -0.684 256.759 -0.863
201912 -0.595 256.974 -0.750
202003 -0.575 258.115 -0.722
202006 0.674 257.797 0.847
202009 -0.218 260.280 -0.271
202012 -0.634 260.474 -0.789
202103 -0.614 264.877 -0.751
202106 -0.327 271.696 -0.390
202109 -0.525 274.310 -0.620
202112 -0.743 278.802 -0.864
202203 -0.010 287.504 -0.011
202206 0.624 296.311 0.682
202209 0.733 296.808 0.800
202212 0.702 296.797 0.766
202303 0.300 301.836 0.322
202306 0.620 305.109 0.658
202309 1.250 307.789 1.316
202312 1.160 306.746 1.225
202403 0.740 312.332 0.768
202406 0.990 314.175 1.021
202409 0.970 315.301 0.997
202412 1.080 315.605 1.109
202503 1.500 319.799 1.520
202506 0.670 322.561 0.673
202509 1.510 324.800 1.507
202512 1.640 324.054 1.640

Add all the adjusted EPS together and divide 10 will get our e10.

Frequently Asked Questions Learn more about E10 →
What does a E10 of NT$-1.27 mean?
LuxNet (ROCO:4979) has a E10 of NT$-1.27 as of Dec. 2025. E10 represents the company's inflation-adjusted earnings per share over a 10-year period. View historical data on LuxNet and its competitors.
Is LuxNet's E10 too high?
LuxNet's current E10 is NT$-1.27. Overall, LuxNet has a GF Score™ of 61/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does LuxNet's E10 compare to NVDA and AVGO?
LuxNet's E10 of NT$-1.27 can be compared against companies in the Semiconductors industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good E10 for a Semiconductors company?
A good E10 depends on the Semiconductors industry context. However, E10 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 E10 mean?
A high E10 can signal that a stock is expensive relative to its fundamentals. E10 represents the company's inflation-adjusted earnings per share over a 10-year period. View historical data on LuxNet and its competitors. LuxNet's current E10 is NT$-1.27. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is LuxNet stock overvalued right now?
Based on GuruFocus' analysis, LuxNet (ROCO:4979) is currently considered Significantly Overvalued. The stock's GF Value™ is NT$261.95, compared to a current price of NT$410.00 — trading 56.5% above its estimated fair value. The current E10 is NT$-1.27. LuxNet's overall GF Score™ is 61/100 with 1 warning sign to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is E10 calculated?
E10 is calculated from a company's financial statements. For LuxNet (ROCO:4979), the current E10 is NT$-1.27 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 LuxNet (ROCO:4979) Overvalued in 2026?

Based on GuruFocus' analysis, LuxNet stock appears to be overvalued. The current stock price of NT$410.00 is trading 56.5% above its estimated GF Value™ of NT$261.95. GuruFocus considers LuxNet to be Significantly Overvalued.

Key valuation signals for ROCO:4979:

  • E10: NT$-1.27
  • GF Value™: NT$261.95 vs. price of NT$410.00 (56.5% above fair value)
  • GF Score™: 61/100 with 1 warning sign

No single metric tells the full story. See the ROCO:4979 stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.


LuxNet Business Description

Address No. 6, Hejiang Road, Zhongli District, Taoyuan, TWN, 32061
LuxNet Corp is engaged in the manufacturing, processing and sale of electronic components and active components for optical communication and the retail sale of electronic materials. Its products include CHIP, TO-CAN and OPTICAL SUB-ASSEMBLY, and its main product is active components for optical communication and modules. It also provides OEM services including Contract Manufacturing Service, Module Manufacturing Service and Optical Engine Manufacturing Service. The Group's revenues are mainly from active components for optical communication and are recognized when control of the goods is transferred to the customer. It operates in Taiwan, China, North America and other regions, with North America generating maximum revenue.
61GF Score

Get the complete analysis for ROCO:4979

E10 is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.

NT$410.00
Price
NT$261.95
GF Value