AMPH (Amphastar Pharmaceuticals) Cyclically Adjusted PB Ratio: (As of Aug. 08, 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.

AMPH Amphastar Pharmaceuticals Inc AMPH
83 GF Score
Price $20.76
GF Value $37.50
Valuation Significantly Undervalued
! 4 Warning Signs
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What is Amphastar Pharmaceuticals Cyclically Adjusted PB Ratio?

Shiller PE for Stocks: The True Measure of Stock Valuation


Amphastar Pharmaceuticals  (NAS:AMPH) 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.


Amphastar Pharmaceuticals Cyclically Adjusted PB Ratio Related Terms


Amphastar Pharmaceuticals Cyclically Adjusted PB Ratio Historical Data

* Premium members only.

The historical data trend for Amphastar Pharmaceuticals'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.

Amphastar Pharmaceuticals Cyclically Adjusted PB Ratio Chart

Amphastar Pharmaceuticals 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 3.16 6.50 3.56 2.33

Amphastar Pharmaceuticals 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 2.08 2.35 2.33 1.64 0.00

AMPH vs ESPR, NIKA, BIOA: Cyclically Adjusted PB Ratio Comparison

For the Drug Manufacturers - Specialty & Generic subindustry, Amphastar Pharmaceuticals'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.


Amphastar Pharmaceuticals Cyclically Adjusted PB Ratio vs Drug Manufacturers Industry

For the Drug Manufacturers industry and Healthcare sector, Amphastar Pharmaceuticals's Cyclically Adjusted PB Ratio distribution charts can be found below:

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


AMPH
83GF Score
Amphastar Pharmaceuticals Inc AMPH
Cyclically Adjusted PB Ratio is just one metric. See GF Score™, valuation, warning signs, and more.
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Amphastar Pharmaceuticals 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.

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

For example, Amphastar Pharmaceuticals'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)
=17.369/333.9520*333.9520
=17.369

Current CPI (Jun. 2026) = 333.9520.

Amphastar Pharmaceuticals Quarterly Data

Book Value per Share CPI Adj_Book
201609 7.134 241.428 9.868
201612 7.119 241.432 9.847
201703 7.084 243.801 9.703
201706 7.207 244.955 9.825
201709 7.204 246.819 9.747
201712 7.158 246.524 9.697
201803 7.011 249.554 9.382
201806 6.905 251.989 9.151
201809 6.920 252.439 9.154
201812 7.129 251.233 9.476
201903 7.112 254.202 9.343
201906 8.214 256.143 10.709
201909 8.250 256.759 10.730
201912 8.188 256.974 10.641
202003 8.153 258.115 10.548
202006 8.373 257.797 10.846
202009 8.525 260.280 10.938
202012 8.470 260.474 10.859
202103 8.499 264.877 10.715
202106 8.794 271.696 10.809
202109 8.965 274.310 10.914
202112 9.337 278.802 11.184
202203 9.836 287.504 11.425
202206 10.192 296.311 11.487
202209 10.392 296.808 11.693
202212 10.988 296.797 12.364
202303 11.386 301.836 12.597
202306 12.070 305.109 13.211
202309 12.425 307.789 13.481
202312 13.302 306.746 14.482
202403 13.766 312.332 14.719
202406 14.569 314.175 15.486
202409 15.043 315.301 15.933
202412 15.379 315.605 16.273
202503 15.760 319.799 16.457
202506 16.293 322.561 16.868
202509 16.759 324.800 17.231
202512 17.281 324.054 17.809
202603 17.326 330.213 17.522
202606 17.369 333.952 17.369

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 Amphastar Pharmaceuticals (AMPH) Overvalued in 2026?

Based on GuruFocus' analysis, Amphastar Pharmaceuticals stock appears to be undervalued. The current stock price of $20.76 is trading 44.6% below its estimated GF Value™ of $37.50. GuruFocus considers Amphastar Pharmaceuticals to be Significantly Undervalued.

Key valuation signals for AMPH:

  • Cyclically Adjusted PB Ratio:
  • GF Value™: $37.50 vs. price of $20.76 (44.6% below fair value)
  • GF Score™: 83/100 with 4 warning signs

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


Amphastar Pharmaceuticals Business Description

Other Exchanges 29A:Germany
Address 11570 6th Street, Rancho Cucamonga, CA, USA, 91730
Amphastar Pharmaceuticals Inc is a bio-pharmaceutical company focusing on developing, manufacturing, marketing, and selling technically challenging generic and proprietary injectable, inhalation, and intranasal products, as well as insulin active pharmaceutical ingredient (or insulin API products. The company's finished products are used in hospital or urgent care clinical settings and are contracted and distributed through group purchasing organizations and drug wholesalers. The company has one reportable segment: pharmaceutical products. Geographically, the business presence of the firm is seen in the United States, China, and France, of which the U.S. accounts for the majority of the revenue.
83GF Score

Get the complete analysis for AMPH

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

$20.76
Price
$37.50
GF Value