Plug Power (XBUL:PLUN) Cyclically Adjusted PB Ratio: (As of Aug. 11, 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.
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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.

XBUL:PLUN Plug Power Inc XBUL:PLUN
19 GF Score
Price €1.94
GF Value €1.35
Valuation Significantly Overvalued
! 6 Warning Signs
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What is Plug Power Cyclically Adjusted PB Ratio?

Shiller PE for Stocks: The True Measure of Stock Valuation


Plug Power  (XBUL:PLUN) Cyclically Adjusted PB Ratio Explanation

Compared with the regular PB Ratio, which works poorly for cyclical businesses, the Cyclically Adjusted PB Ratio smoothed out the fluctuations of book value during business cycles. Therefore it is more accurate in reflecting the valuation of the company.

If a company has consistent business performance, the Cyclically Adjusted PB Ratio should give similar results to regular PB Ratio.


Plug Power Cyclically Adjusted PB Ratio Related Terms


Plug Power Cyclically Adjusted PB Ratio Historical Data

* Premium members only.

The historical data trend for Plug Power's Cyclically Adjusted PB Ratio 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.

Plug Power Cyclically Adjusted PB Ratio Chart

Plug Power Annual Data
Trend Dec16 Dec17 Dec18 Dec19 Dec20 Dec21 Dec22 Dec23 Dec24 Dec25
Cyclically Adjusted PB Ratio
Get a 7-Day Free Trial Premium Member Only Premium Member Only 20.63 5.88 1.63 0.69 0.62

Plug Power Quarterly Data
Sep21 Dec21 Mar22 Jun22 Sep22 Dec22 Mar23 Jun23 Sep23 Dec23 Mar24 Jun24 Sep24 Dec24 Mar25 Jun25 Sep25 Dec25 Mar26 Jun26
Cyclically Adjusted PB Ratio 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 0.47 0.73 0.62 0.70 0.00

XBUL:PLUN vs HAYW, ATKR, FCEL: Cyclically Adjusted PB Ratio Comparison

For the Electrical Equipment & Parts subindustry, Plug Power'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.


Plug Power Cyclically Adjusted PB Ratio vs Industrial Products Industry

For the Industrial Products industry and Industrials sector, Plug Power's Cyclically Adjusted PB Ratio distribution charts can be found below:

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


XBUL:PLUN
19GF Score
Plug Power Inc XBUL:PLUN
Cyclically Adjusted PB Ratio is just one metric. See GF Score™, valuation, warning signs, and more.
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Plug Power Cyclically Adjusted PB Ratio Calculation

Like the Shiller PE Ratio, the Cyclically Adjusted PB Ratio takes the Book Value per Share from the past 10 years, adjusts it for inflation, and then calculates the average. This average is then used for the P/B calculation. Because it considers this 10-year average, it's often referred to as the CAPB Ratio.

The Shiller PE Ratio was first used by professor Robert Shiller to measure the valuation of the overall market. The similar calculation is applied by GuruFocus to calculate the Cyclically Adjusted PB Ratio.

Plug Power's Cyclically Adjusted Book per Share for the quarter that ended in Jun. 2026 is calculated as:

For example, Plug Power's adjusted Book Value per Share data for the three months ended in Jun. 2026 was:

Adj_Book=Book Value per Share/CPI of Jun. 2026 (Change)*Current CPI (Jun. 2026)
=0.363/333.9520*333.9520
=0.363

Current CPI (Jun. 2026) = 333.9520.

Plug Power Quarterly Data

Book Value per Share CPI Adj_Book
201609 0.462 241.428 0.639
201612 0.422 241.432 0.584
201703 0.297 243.801 0.407
201706 0.389 244.955 0.530
201709 0.320 246.819 0.433
201712 0.272 246.524 0.368
201803 0.187 249.554 0.250
201806 0.104 251.989 0.138
201809 0.057 252.439 0.075
201812 0.011 251.233 0.015
201903 -0.005 254.202 -0.007
201906 -0.041 256.143 -0.053
201909 -0.055 256.759 -0.072
201912 0.696 256.974 0.904
202003 0.307 258.115 0.397
202006 0.640 257.797 0.829
202009 1.296 260.280 1.663
202012 1.052 260.474 1.349
202103 7.295 264.877 9.197
202106 7.023 271.696 8.632
202109 6.945 274.310 8.455
202112 7.056 278.802 8.452
202203 7.031 287.504 8.167
202206 7.095 296.311 7.996
202209 7.345 296.808 8.264
202212 6.493 296.797 7.306
202303 6.169 301.836 6.825
202306 5.735 305.109 6.277
202309 5.432 307.789 5.894
202312 4.384 306.746 4.773
202403 3.926 312.332 4.198
202406 3.525 314.175 3.747
202409 3.100 315.301 3.283
202412 1.812 315.605 1.917
202503 1.758 319.799 1.836
202506 1.270 322.561 1.315
202509 1.005 324.800 1.033
202512 0.600 324.054 0.618
202603 0.465 330.213 0.470
202606 0.363 333.952 0.363

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

Is Plug Power (XBUL:PLUN) Overvalued in 2026?

Based on GuruFocus' analysis, Plug Power stock appears to be overvalued. The current stock price of €1.94 is trading 43.7% above its estimated GF Value™ of €1.35. GuruFocus considers Plug Power to be Significantly Overvalued.

Key valuation signals for XBUL:PLUN:

  • Cyclically Adjusted PB Ratio:
  • GF Value™: €1.35 vs. price of €1.94 (43.7% above fair value)
  • GF Score™: 19/100 with 6 warning signs

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


Plug Power Business Description

Address 125 Vista Boulevard, Slingerlands, NY, USA, 12159
Plug Power Inc is building an end-to-end green hydrogen ecosystem, from production, storage, and delivery to energy generation. The company plans to build and operate green hydrogen highways across North America and Europe. Plug will deliver its green hydrogen solutions directly to its customers and through joint venture partners into multiple end markets, including material handling, e-mobility, power generation, and industrial applications.
19GF Score

Get the complete analysis for XBUL:PLUN

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

€1.94
Price
€1.35
GF Value