MannKind (STU:NNFN) Cyclically Adjusted PB Ratio: (As of Aug. 20, 2026)

Author: Vera Yuan Vera Yuan
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Director of Data and Quant Analytics at GuruFocus
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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.

STU:NNFN MannKind Corp STU:NNFN
71 GF Score
Price €3.73
GF Value €6.46
Valuation Possible Value Trap
! 8 Warning Signs
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What is MannKind Cyclically Adjusted PB Ratio?

Shiller PE for Stocks: The True Measure of Stock Valuation


MannKind  (STU:NNFN) 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.


MannKind Cyclically Adjusted PB Ratio Related Terms


MannKind Cyclically Adjusted PB Ratio Historical Data

* Premium members only.

The historical data trend for MannKind'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.

MannKind Cyclically Adjusted PB Ratio Chart

MannKind 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 0.00 0.00 0.00 0.00 0.00

MannKind 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 0.00 0.00 0.00 0.00 0.00

STU:NNFN vs ABSI, ORIC, ARDX: Cyclically Adjusted PB Ratio Comparison

For the Biotechnology subindustry, MannKind'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.


MannKind Cyclically Adjusted PB Ratio vs Biotechnology Industry

For the Biotechnology industry and Healthcare sector, MannKind's Cyclically Adjusted PB Ratio distribution charts can be found below:

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


STU:NNFN
71GF Score
MannKind Corp STU:NNFN
Cyclically Adjusted PB Ratio is just one metric. See GF Score™, valuation, warning signs, and more.
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MannKind 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.

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

For example, MannKind'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)
=-0.188/333.9520*333.9520
=-0.188

Current CPI (Jun. 2026) = 333.9520.

MannKind Quarterly Data

Book Value per Share CPI Adj_Book
201609 -2.223 241.428 -3.075
201612 -1.819 241.432 -2.516
201703 -1.940 243.801 -2.657
201706 -1.882 244.955 -2.566
201709 -2.011 246.819 -2.721
201712 -1.524 246.524 -2.064
201803 -1.437 249.554 -1.923
201806 -1.215 251.989 -1.610
201809 -1.104 252.439 -1.460
201812 -0.823 251.233 -1.094
201903 -0.886 254.202 -1.164
201906 -0.916 256.143 -1.194
201909 -0.813 256.759 -1.057
201912 -0.810 256.974 -1.053
202003 -0.841 258.115 -1.088
202006 -0.697 257.797 -0.903
202009 -0.685 260.280 -0.879
202012 -0.613 260.474 -0.786
202103 -0.586 264.877 -0.739
202106 -0.610 271.696 -0.750
202109 -0.627 274.310 -0.763
202112 -0.737 278.802 -0.883
202203 -0.835 287.504 -0.970
202206 -0.908 296.311 -1.023
202209 -0.912 296.808 -1.026
202212 -0.897 296.797 -1.009
202303 -0.903 301.836 -0.999
202306 -0.896 305.109 -0.981
202309 -0.875 307.789 -0.949
202312 -0.836 306.746 -0.910
202403 -0.781 312.332 -0.835
202406 -0.764 314.175 -0.812
202409 -0.686 315.301 -0.727
202412 -0.248 315.605 -0.262
202503 -0.178 319.799 -0.186
202506 -0.156 322.561 -0.162
202509 -0.124 324.800 -0.127
202512 -0.142 324.054 -0.146
202603 -0.166 330.213 -0.168
202606 -0.188 333.952 -0.188

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 MannKind (STU:NNFN) Overvalued in 2026?

Based on GuruFocus' analysis, MannKind stock appears to be undervalued. The current stock price of €3.73 is trading 42.2% below its estimated GF Value™ of €6.46. GuruFocus considers MannKind to be Possible Value Trap.

Key valuation signals for STU:NNFN:

  • Cyclically Adjusted PB Ratio:
  • GF Value™: €6.46 vs. price of €3.73 (42.2% below fair value)
  • GF Score™: 71/100 with 8 warning signs

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


MannKind Business Description

Other Exchanges MNKD:USA
Address 1 Casper Street, Danbury, CT, USA, 06810
MannKind Corp is a biopharmaceutical company focused on the development and commercialization of patient-centric therapies that address serious unmet medical needs for those living with cardiometabolic and orphan lung diseases. The Company is currently commercializing three products: Afrezza (insulin human) Inhalation Powder, an ultra rapid-acting inhaled insulin indicated to improve glycemic control in adults with diabetes; Furoscix (furosemide injection), to treat fluid buildup in patients with chronic heart failure or chronic kidney disease; and the V-Go wearable insulin delivery device, which provides continuous subcutaneous infusion of insulin in adults that require insulin.
71GF Score

Get the complete analysis for STU:NNFN

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

€3.73
Price
€6.46
GF Value