Lumen Technologies (STU:CYTH) Cyclically Adjusted Book per Share: €12.58 (As of Mar. 2026)

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.

STU:CYTH Lumen Technologies Inc STU:CYTH
56 GF Score
Price €5.63
GF Value €3.36
Valuation Significantly Overvalued
! 5 Warning Signs
View Full Analysis

What is Lumen Technologies Cyclically Adjusted Book per Share?

Lumen Technologies STU:CYTH -4.09% 56 Cyclically Adjusted Book per Share is €12.58 as of Mar. 2026. GuruFocus rates STU:CYTH with a GF Score™ of 56/100 and a GF Value™ of €3.36 (Significantly Overvalued). The stock has 5 warning signs investors should review.

E10 is a concept invented by Prof. Robert Shiller, who uses E10 for his Shiller PE Ratio calculation. E10 is the average of the inflation adjusted earnings of a company over the past 10 years. The similar calculation is applied by GuruFocus to calculate the Cyclically Adjusted Book per Share and the Cyclically Adjusted PB Ratio. The Cyclically Adjusted Book per Share is the average of the inflation adjusted Book Value per Share of a company over the past 10 years.

Lumen Technologies's adjusted book value per share for the three months ended in Mar. 2026 was €-1.106. Add all the adjusted book value per share for the past 10 years together and divide the count will get our Cyclically Adjusted Book per Share, which is €12.58 for the trailing ten years ended in Mar. 2026.

During the past 12 months, Lumen Technologies's average Cyclically Adjusted Book Growth Rate was -17.60% per year. During the past 3 years, the average Cyclically Adjusted Book Growth Rate was -14.30% per year. During the past 5 years, the average Cyclically Adjusted Book Growth Rate was -10.60% per year. During the past 10 years, the average Cyclically Adjusted Book Growth Rate was -6.90% 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 Cyclically Adjusted Book Growth Rate using Cyclically Adjusted Book per Share data.

During the past 13 years, the highest 3-Year average Cyclically Adjusted Book Growth Rate of Lumen Technologies was 17.90% per year. The lowest was -14.30% per year. And the median was 6.30% per year.

As of today (2026-07-14), Lumen Technologies's current stock price is €5.63. Lumen Technologies's Cyclically Adjusted Book per Share for the quarter that ended in Mar. 2026 was €12.58. Lumen Technologies's Cyclically Adjusted PB Ratio of today is 0.45.

During the past 13 years, the highest Cyclically Adjusted PB Ratio of Lumen Technologies was 0.96. The lowest was 0.05. And the median was 0.43.


Lumen Technologies  (STU:CYTH) Cyclically Adjusted Book per Share Explanation

If a company grows much fast than inflation, Cyclically Adjusted Book per Share may underestimate the company's equity. Cyclically Adjusted PB Ratio can seem to be too high even the actual PB Ratio is low.

For the Cyclically Adjusted PB Ratio, the book value of the past 10 years are inflation-adjusted and averaged. The result is used for P/B calculation. Since it looks at the average over the last 10 years, the Cyclically Adjusted PB Ratio is also called CAPB Ratio.

The Shiller PE Ratio was first used by professor Robert Shiller. He uses E10 for his Shiller PE Ratio calculation. E10 is the average of the inflation adjusted earnings per share of a company over the past 10 years. The similar calculation is applied by GuruFocus to calculate the Cyclically Adjusted PB Ratio. The Cyclically Adjusted Book per Share is the average of the inflation adjusted book value per share of a company over the past 10 years.

Lumen Technologies's Cyclically Adjusted PB Ratio of today is calculated as

Cyclically Adjusted PB Ratio=Share Price/Cyclically Adjusted Book per Share
=5.63/12.58
=0.45

* 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.

During the past 13 years, the highest Cyclically Adjusted PB Ratio of Lumen Technologies was 0.96. The lowest was 0.05. And the median was 0.43.


Be Aware

Cyclically Adjusted PB Ratio works better for cyclical companies. It gives you a better idea on the company's real book value.


Lumen Technologies Cyclically Adjusted Book per Share Related Terms


Lumen Technologies Cyclically Adjusted Book per Share Historical Data

* Premium members only.

The historical data trend for Lumen Technologies's Cyclically Adjusted Book per Share 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.

Lumen Technologies Cyclically Adjusted Book per Share Chart

Lumen Technologies Annual Data
Trend Dec16 Dec17 Dec18 Dec19 Dec20 Dec21 Dec22 Dec23 Dec24 Dec25
Cyclically Adjusted Book per Share
Get a 7-Day Free Trial Premium Member Only Premium Member Only 22.53 22.71 19.24 17.79 12.39

Lumen Technologies Quarterly Data
Jun21 Sep21 Dec21 Mar22 Jun22 Sep22 Dec22 Mar23 Jun23 Sep23 Dec23 Mar24 Jun24 Sep24 Dec24 Mar25 Jun25 Sep25 Dec25 Mar26
Cyclically Adjusted Book per Share 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 16.30 14.32 13.11 12.39 12.58

STU:CYTH vs GSAT, IRDM, LBRDA: Cyclically Adjusted Book per Share Comparison

For the Telecom Services subindustry, Lumen Technologies's Cyclically Adjusted PB Ratio, along with its competitors' market caps and Cyclically Adjusted PB 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.


Lumen Technologies Cyclically Adjusted PB Ratio vs Telecommunication Services Industry

For the Telecommunication Services industry and Communication Services sector, Lumen Technologies's Cyclically Adjusted PB Ratio distribution charts can be found below:

* The bar in red indicates where Lumen Technologies's Cyclically Adjusted PB Ratio falls into.


STU:CYTH
56GF Score
Lumen Technologies Inc STU:CYTH
Cyclically Adjusted Book per Share is just one metric. See GF Score™, valuation, warning signs, and more.
View Full Analysis

Lumen Technologies Cyclically Adjusted Book per Share Calculation

E10 is a concept invented by Prof. Robert Shiller, who uses E10 for his Shiller PE Ratio calculation. E10 is the average of the inflation adjusted earnings of a company over the past 10 years. The similar calculation is applied by GuruFocus to calculate the Cyclically Adjusted Book per Share and the Cyclically Adjusted PB Ratio. The Cyclically Adjusted Book per Share is the average of the inflation adjusted Book Value per Share of a company over the past 10 years.

What is Cyclically Adjusted Book per Share? How do we calculate Cyclically Adjusted Book per Share?

Cyclically Adjusted Book per Share is the average of the inflation adjusted Book Value per Share of a company over the past 10 years. Let's use an example to explain.

If we want to calculate the Cyclically Adjusted Book per Share of Wal-Mart (WMT) for Dec. 31, 2010, we need to have the inflation data and the book value per share from 2001 through 2010.

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

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, Lumen Technologies's adjusted Book Value per Share data for the three months ended in Mar. 2026 was:

Adj_Book= Book Value per Share /CPI of Mar. 2026 (Change)*Current CPI (Mar. 2026)
=-1.106/330.2130*330.2130
=-1.106

Current CPI (Mar. 2026) = 330.2130.

Lumen Technologies Quarterly Data

Book Value per Share CPI Adj_Book
201606 22.799 241.018 31.236
201609 22.641 241.428 30.967
201612 23.241 241.432 31.787
201703 22.668 243.801 30.702
201706 21.185 244.955 28.559
201709 19.782 246.819 26.466
201712 18.566 246.524 24.869
201803 17.626 249.554 23.323
201806 18.243 251.989 23.906
201809 18.085 252.439 23.657
201812 16.135 251.233 21.207
201903 10.991 254.202 14.278
201906 11.116 256.143 14.330
201909 11.387 256.759 14.645
201912 11.121 256.974 14.291
202003 10.958 258.115 14.019
202006 10.896 257.797 13.957
202009 10.592 260.280 13.438
202012 8.364 260.474 10.603
202103 8.588 264.877 10.706
202106 8.791 271.696 10.684
202109 9.219 274.310 11.098
202112 10.238 278.802 12.126
202203 10.797 287.504 12.401
202206 11.196 296.311 12.477
202209 12.276 296.808 13.658
202212 9.777 296.797 10.878
202303 10.220 301.836 11.181
202306 2.091 305.109 2.263
202309 2.061 307.789 2.211
202312 0.379 306.746 0.408
202403 0.456 312.332 0.482
202406 0.426 314.175 0.448
202409 0.304 315.301 0.318
202412 0.437 315.605 0.457
202503 0.261 319.799 0.269
202506 -0.502 322.561 -0.514
202509 -0.974 324.800 -0.990
202512 -0.930 324.054 -0.948
202603 -1.106 330.213 -1.106

Add all the adjusted book value per share together and divide the count will get our Cyclically Adjusted Book per Share.

What does a Cyclically Adjusted Book per Share of €12.58 mean?
Lumen Technologies (STU:CYTH) has a Cyclically Adjusted Book per Share of €12.58 as of Mar. 2026. Cyclically adjusted book value per share represents the company's inflation-adjusted book value per share over a 10-year period. View historical data on Lumen Technologies and its competitors.
Is Lumen Technologies' Cyclically Adjusted Book per Share too high?
Lumen Technologies' current Cyclically Adjusted Book per Share is €12.58. Overall, Lumen Technologies has a GF Score™ of 56/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Lumen Technologies' Cyclically Adjusted Book per Share compare to GSAT and IRDM?
Lumen Technologies' Cyclically Adjusted Book per Share of €12.58 can be compared against companies in the Telecommunication Services industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Cyclically Adjusted Book per Share for a Telecommunication Services company?
A good Cyclically Adjusted Book per Share depends on the Telecommunication Services industry context. However, Cyclically Adjusted Book per Share 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 Cyclically Adjusted Book per Share mean?
A high Cyclically Adjusted Book per Share can signal that a stock is expensive relative to its fundamentals. Cyclically adjusted book value per share represents the company's inflation-adjusted book value per share over a 10-year period. View historical data on Lumen Technologies and its competitors. Lumen Technologies's current Cyclically Adjusted Book per Share is €12.58. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Lumen Technologies stock overvalued right now?
Based on GuruFocus' analysis, Lumen Technologies (STU:CYTH) is currently considered Significantly Overvalued. The stock's GF Value™ is €3.36, compared to a current price of €5.63 — trading 67.6% above its estimated fair value. The current Cyclically Adjusted Book per Share is €12.58. Lumen Technologies' overall GF Score™ is 56/100 with 5 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Cyclically Adjusted Book per Share calculated?
Cyclically Adjusted Book per Share is calculated from a company's financial statements. For Lumen Technologies (STU:CYTH), the current Cyclically Adjusted Book per Share is €12.58 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 Lumen Technologies (STU:CYTH) Overvalued in 2026?

Based on GuruFocus' analysis, Lumen Technologies stock appears to be overvalued. The current stock price of €5.63 is trading 67.6% above its estimated GF Value™ of €3.36. GuruFocus considers Lumen Technologies to be Significantly Overvalued.

Key valuation signals for STU:CYTH:

  • Cyclically Adjusted Book per Share: €12.58
  • GF Value™: €3.36 vs. price of €5.63 (67.6% above fair value)
  • GF Score™: 56/100 with 5 warning signs

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


Lumen Technologies Business Description

Address 100 CenturyLink Drive, Monroe, LA, USA, 71203
Lumen Technologies is one of the largest telecommunications carriers serving global enterprises. The merger with Level 3 in 2017, the 2022 divestiture of much of its local phone business in rural areas, and the 2026 sale of its remaining consumer fiber network to AT&T have shifted the company's operations away from the legacy consumer business and toward enterprise services, which account for about 85%-90% of revenue. Lumen offers businesses a full suite of communications services, providing colocation and data center services, data transportation, phone service, and internet access.
56GF Score

Get the complete analysis for STU:CYTH

Cyclically Adjusted Book per Share is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.

€5.63
Price
€3.36
GF Value