Knowles (STU:1K3) E10: €-0.18 (As of Mar. 2026)

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Director of Data and Quant Analytics at GuruFocus
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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.

STU:1K3 Knowles Corp STU:1K3
66 GF Score
Price €30.80
GF Value €20.67
Valuation Significantly Overvalued
! 3 Warning Signs
View Full Analysis

What is Knowles E10?

Knowles STU:1K3 -0.65% 66 E10 is €-0.18 as of Mar. 2026. GuruFocus rates STU:1K3 with a GF Score™ of 66/100 and a GF Value™ of €20.67 (Significantly Overvalued). The stock has 3 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.

Knowles's adjusted earnings per share data for the three months ended in Mar. 2026 was €0.095. Add all the adjusted EPS for the past 10 years together and divide 10 will get our e10, which is €-0.18 for the trailing ten years ended in Mar. 2026.

During the past 3 years, the average E10 Growth Rate was 14.80% 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 Knowles was 14.80% per year. The lowest was 14.80% per year. And the median was 14.80% per year.

As of today (2026-07-18), Knowles's current stock price is €30.80. Knowles's E10 for the quarter that ended in Mar. 2026 was €-0.18. Knowles's Shiller PE Ratio of today is .


Knowles  (STU:1K3) 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.


Knowles E10 Related Terms


Knowles E10 Historical Data

* Premium members only.

The historical data trend for Knowles'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.

Knowles E10 Chart

Knowles 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 0.00 -0.39 -0.48 -0.63 -0.22

Knowles Quarterly Data
Jun21 Sep21 Dec21 Mar22 Jun22 Sep22 Dec22 Mar23 Jun23 Sep23 Dec23 Mar24 Jun24 Sep24 Dec24 Mar25 Jun25 Sep25 Dec25 Mar26
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 -0.60 -0.53 -0.49 -0.22 -0.18

STU:1K3 vs BHE, OSIS, ROG: E10 Comparison

For the Electronic Components subindustry, Knowles'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.


Knowles Shiller PE Ratio vs Hardware Industry

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

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


STU:1K3
66GF Score
Knowles Corp STU:1K3
E10 is just one metric. See GF Score™, valuation, warning signs, and more.
View Full Analysis

Knowles 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, Knowles's adjusted earnings per share data for the three months ended in Mar. 2026 was:

Adj_EPS= Earnings per Share (Diluted) /CPI of Mar. 2026 (Change)*Current CPI (Mar. 2026)
=0.095/330.2130*330.2130
=0.095

Current CPI (Mar. 2026) = 330.2130.

Knowles Quarterly Data

per share eps CPI Adj_EPS
201606 -0.249 241.018 -0.341
201609 -0.071 241.428 -0.097
201612 0.199 241.432 0.272
201703 -0.037 243.801 -0.050
201706 -0.294 244.955 -0.396
201709 0.143 246.819 0.191
201712 0.794 246.524 1.064
201803 -0.003 249.554 -0.004
201806 0.043 251.989 0.056
201809 -0.154 252.439 -0.201
201812 0.765 251.233 1.005
201903 -0.027 254.202 -0.035
201906 0.053 256.143 0.068
201909 0.245 256.759 0.315
201912 0.189 256.974 0.243
202003 -0.090 258.115 -0.115
202006 -0.186 257.797 -0.238
202009 0.051 260.280 0.065
202012 0.263 260.474 0.333
202103 0.109 264.877 0.136
202106 0.158 271.696 0.192
202109 0.247 274.310 0.297
202112 0.867 278.802 1.027
202203 0.173 287.504 0.199
202206 -2.497 296.311 -2.783
202209 0.030 296.808 0.033
202212 -2.152 296.797 -2.394
202303 -0.056 301.836 -0.061
202306 0.138 305.109 0.149
202309 0.169 307.789 0.181
202312 0.477 306.746 0.513
202403 0.028 312.332 0.030
202406 -2.694 314.175 -2.832
202409 0.009 315.301 0.009
202412 0.201 315.605 0.210
202503 -0.018 319.799 -0.019
202506 0.078 322.561 0.080
202509 0.170 324.800 0.173
202512 0.213 324.054 0.217
202603 0.095 330.213 0.095

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 €-0.18 mean?
Knowles (STU:1K3) has a E10 of €-0.18 as of Mar. 2026. E10 represents the company's inflation-adjusted earnings per share over a 10-year period. View historical data on Knowles and its competitors.
Is Knowles' E10 too high?
Knowles' current E10 is €-0.18. Overall, Knowles has a GF Score™ of 66/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Knowles' E10 compare to BHE and OSIS?
Knowles' E10 of €-0.18 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 Knowles and its competitors. Knowles's current E10 is €-0.18. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Knowles stock overvalued right now?
Based on GuruFocus' analysis, Knowles (STU:1K3) is currently considered Significantly Overvalued. The stock's GF Value™ is €20.67, compared to a current price of €30.80 — trading 49% above its estimated fair value. The current E10 is €-0.18. Knowles' overall GF Score™ is 66/100 with 3 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 Knowles (STU:1K3), the current E10 is €-0.18 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 Knowles (STU:1K3) Overvalued in 2026?

Based on GuruFocus' analysis, Knowles stock appears to be overvalued. The current stock price of €30.80 is trading 49% above its estimated GF Value™ of €20.67. GuruFocus considers Knowles to be Significantly Overvalued.

Key valuation signals for STU:1K3:

  • E10: €-0.18
  • GF Value™: €20.67 vs. price of €30.80 (49% above fair value)
  • GF Score™: 66/100 with 3 warning signs

No single metric tells the full story. See the STU:1K3 stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.


Knowles Business Description

Other Exchanges KN:USA0JRJ:UK
Address 1151 Maplewood Drive, Itasca, IL, USA, 60143
Knowles Corp is engaged in the manufacturing of micro-acoustic microphones and balanced armature speakers, audio solutions, high-performance capacitors, and radio frequency filtering products. It operates in two segments; the Precision Devices segment specializes in the design and delivery of high-performance capacitor products and RF solutions; and Medtech & Specialty Audio segment designs and manufactures microphones and balanced armature speakers used in applications. The majority of its revenue comes from the Precision Devices. Geographically, it operates in United States, Asia, Other Americas, Europe and Others, out of which United States generates maximum revenue.
66GF Score

Get the complete analysis for STU:1K3

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

€30.80
Price
€20.67
GF Value