Bull Will Co (ROCO:6259) E10: NT$-4.87 (As of Dec. 2025)

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Vera Yuan
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Director of Data and Quant Analytics at GuruFocus
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Charlie Tian
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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:6259 Bull Will Co Ltd ROCO:6259
66 GF Score
Price NT$36.65
GF Value NT$16.34
Valuation Significantly Overvalued
! 7 Warning Signs
View Full Analysis

What is Bull Will Co E10?

Bull Will Co ROCO:6259 -2.27% 66 E10 is NT$-4.87 as of Dec. 2025. GuruFocus rates ROCO:6259 with a GF Score™ of 66/100 and a GF Value™ of NT$16.34 (Significantly Overvalued). The stock has 7 warning signs 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.

Bull Will Co's adjusted earnings per share data for the three months ended in Dec. 2025 was NT$0.240. Add all the adjusted EPS for the past 10 years together and divide 10 will get our e10, which is NT$-4.87 for the trailing ten years ended in Dec. 2025.

During the past 3 years, the average E10 Growth Rate was 12.60% per year. During the past 5 years, the average E10 Growth Rate was 7.50% 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 Bull Will Co was 12.60% per year. The lowest was -1.40% per year. And the median was 4.10% per year.

As of today (2026-07-16), Bull Will Co's current stock price is NT$36.65. Bull Will Co's E10 for the quarter that ended in Dec. 2025 was NT$-4.87. Bull Will Co's Shiller PE Ratio of today is .


Bull Will Co  (ROCO:6259) 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.


Bull Will Co E10 Related Terms


Bull Will Co E10 Historical Data

* Premium members only.

The historical data trend for Bull Will Co'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.

Bull Will Co E10 Chart

Bull Will Co 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 -7.56 -7.29 -6.93 -6.31 -4.87

Bull Will Co 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 -6.31 -6.07 -5.54 -5.23 -4.87

ROCO:6259 vs SNX, ARW, AVT: E10 Comparison

For the Electronics & Computer Distribution subindustry, Bull Will Co'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.


Bull Will Co Shiller PE Ratio vs Hardware Industry

For the Hardware industry and Technology sector, Bull Will Co's Shiller PE Ratio distribution charts can be found below:

* The bar in red indicates where Bull Will Co's Shiller PE Ratio falls into.


ROCO:6259
66GF Score
Bull Will Co Ltd ROCO:6259
E10 is just one metric. See GF Score™, valuation, warning signs, and more.
View Full Analysis

Bull Will Co 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, Bull Will Co'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)
=0.24/324.0540*324.0540
=0.240

Current CPI (Dec. 2025) = 324.0540.

Bull Will Co Quarterly Data

per share eps CPI Adj_EPS
201603 -32.978 238.132 -44.877
201606 -1.312 241.018 -1.764
201609 -1.312 241.428 -1.761
201612 -0.358 241.432 -0.481
201703 -1.550 243.801 -2.060
201706 -0.239 244.955 -0.316
201709 -2.028 246.819 -2.663
201712 -0.488 246.524 -0.641
201803 -0.477 249.554 -0.619
201806 -0.298 251.989 -0.383
201809 -0.358 252.439 -0.460
201812 0.000 251.233 0.000
201903 0.060 254.202 0.076
201906 3.757 256.143 4.753
201909 -0.307 256.759 -0.387
201912 0.353 256.974 0.445
202003 0.025 258.115 0.031
202006 -0.025 257.797 -0.031
202009 -0.166 260.280 -0.207
202012 0.604 260.474 0.751
202103 0.042 264.877 0.051
202106 -0.208 271.696 -0.248
202109 -0.017 274.310 -0.020
202112 0.195 278.802 0.227
202203 0.282 287.504 0.318
202206 0.374 296.311 0.409
202209 0.305 296.808 0.333
202212 -0.122 296.797 -0.133
202303 0.113 301.836 0.121
202306 0.383 305.109 0.407
202309 0.373 307.789 0.393
202312 0.067 306.746 0.071
202403 0.201 312.332 0.209
202406 0.153 314.175 0.158
202409 0.020 315.301 0.021
202412 0.110 315.605 0.113
202503 0.278 319.799 0.282
202506 -0.067 322.561 -0.067
202509 0.230 324.800 0.229
202512 0.240 324.054 0.240

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$-4.87 mean?
Bull Will Co (ROCO:6259) has a E10 of NT$-4.87 as of Dec. 2025. E10 represents the company's inflation-adjusted earnings per share over a 10-year period. View historical data on Bull Will Co and its competitors.
Is Bull Will Co's E10 too high?
Bull Will Co's current E10 is NT$-4.87. Overall, Bull Will Co has a GF Score™ of 66/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Bull Will Co's E10 compare to SNX and ARW?
Bull Will Co's E10 of NT$-4.87 can be compared against companies in the Hardware 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 Hardware company?
A good E10 depends on the Hardware 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 Bull Will Co and its competitors. Bull Will Co's current E10 is NT$-4.87. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Bull Will Co stock overvalued right now?
Based on GuruFocus' analysis, Bull Will Co (ROCO:6259) is currently considered Significantly Overvalued. The stock's GF Value™ is NT$16.34, compared to a current price of NT$36.65 — trading 124.3% above its estimated fair value. The current E10 is NT$-4.87. Bull Will Co's overall GF Score™ is 66/100 with 7 warning signs 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 Bull Will Co (ROCO:6259), the current E10 is NT$-4.87 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 Bull Will Co (ROCO:6259) Overvalued in 2026?

Based on GuruFocus' analysis, Bull Will Co stock appears to be overvalued. The current stock price of NT$36.65 is trading 124.3% above its estimated GF Value™ of NT$16.34. GuruFocus considers Bull Will Co to be Significantly Overvalued.

Key valuation signals for ROCO:6259:

  • E10: NT$-4.87
  • GF Value™: NT$16.34 vs. price of NT$36.65 (124.3% above fair value)
  • GF Score™: 66/100 with 7 warning signs

No single metric tells the full story. See the ROCO:6259 stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.


Bull Will Co Business Description

Address Ruihu Street, No. 199, 3rd Floor, Neihu District, Taipei, TWN, 114
Bull Will Co Ltd is a Taiwan-based company that engages in the manufacture and sale of electronic equipment and electronic materials. Its products are categorized under Transformers, EMI / EMC Solution Parts, Power Inductors, LEDs(light-emitting diodes), and other products. Component products have a wide range of applications, including inductors, line protection components, high-power inductors for the industrial and electric industries, and custom components.
66GF Score

Get the complete analysis for ROCO:6259

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

NT$36.65
Price
NT$16.34
GF Value