American International Group (STU:AINN) Cyclically Adjusted PB Ratio: (As of Aug. 10, 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:AINN American International Group Inc STU:AINN
72 GF Score
Price €68.26
GF Value €82.97
Valuation Modestly Undervalued
! 3 Warning Signs
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What is American International Group Cyclically Adjusted PB Ratio?

Shiller PE for Stocks: The True Measure of Stock Valuation


American International Group  (STU:AINN) 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.


American International Group Cyclically Adjusted PB Ratio Related Terms


American International Group Cyclically Adjusted PB Ratio Historical Data

* Premium members only.

The historical data trend for American International Group'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.

American International Group Cyclically Adjusted PB Ratio Chart

American International Group 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 0.68 0.73 0.78 0.85 1.01

American International Group 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 1.00 0.92 1.01 0.88 0.00

STU:AINN vs HIG, ACGL, PLGO: Cyclically Adjusted PB Ratio Comparison

For the Insurance - Diversified subindustry, American International Group'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.


American International Group Cyclically Adjusted PB Ratio vs Insurance Industry

For the Insurance industry and Financial Services sector, American International Group's Cyclically Adjusted PB Ratio distribution charts can be found below:

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


STU:AINN
72GF Score
American International Group Inc STU:AINN
Cyclically Adjusted PB Ratio is just one metric. See GF Score™, valuation, warning signs, and more.
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American International Group 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.

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

For example, American International Group'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)
=66.056/333.9520*333.9520
=66.056

Current CPI (Jun. 2026) = 333.9520.

American International Group Quarterly Data

Book Value per Share CPI Adj_Book
201609 75.750 241.428 104.780
201612 72.671 241.432 100.520
201703 73.481 243.801 100.652
201706 72.639 244.955 99.030
201709 67.640 246.819 91.519
201712 61.253 246.524 82.976
201803 56.729 249.554 75.914
201806 58.768 251.989 77.883
201809 56.755 252.439 75.081
201812 57.167 251.233 75.989
201903 61.360 254.202 80.610
201906 65.166 256.143 84.962
201909 67.966 256.759 88.400
201912 67.438 256.974 87.639
202003 62.717 258.115 81.144
202006 63.653 257.797 82.457
202009 62.704 260.280 80.452
202012 62.852 260.474 80.582
202103 60.791 264.877 76.644
202106 63.685 271.696 78.278
202109 65.472 274.310 79.707
202112 70.774 278.802 84.774
202203 63.479 287.504 73.734
202206 55.616 296.311 62.681
202209 52.747 296.808 59.348
202212 52.059 296.797 58.576
202303 54.984 301.836 60.834
202306 53.988 305.109 59.092
202309 52.529 307.789 56.994
202312 59.727 306.746 65.024
202403 59.483 312.332 63.600
202406 63.536 314.175 67.536
202409 64.383 315.301 68.191
202412 66.992 315.605 70.886
202503 66.032 319.799 68.954
202506 64.280 322.561 66.550
202509 64.288 324.800 66.099
202512 65.280 324.054 67.274
202603 65.585 330.213 66.328
202606 66.056 333.952 66.056

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 American International Group (STU:AINN) Overvalued in 2026?

Based on GuruFocus' analysis, American International Group stock appears to be undervalued. The current stock price of €68.26 is trading 17.7% below its estimated GF Value™ of €82.97. GuruFocus considers American International Group to be Modestly Undervalued.

Key valuation signals for STU:AINN:

  • Cyclically Adjusted PB Ratio:
  • GF Value™: €82.97 vs. price of €68.26 (17.7% below fair value)
  • GF Score™: 72/100 with 3 warning signs

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


American International Group Business Description

Address 1271 Avenue of the Americas, New York, NY, USA, 10020
American International Group is one of the largest insurance and financial services firms in the world and has a global footprint. It operates through a wide range of subsidiaries that provide property, casualty, and life insurance. The company recently spun off its life insurance operations (Corebridge), but still retains a minority stake.
72GF Score

Get the complete analysis for STU:AINN

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

€68.26
Price
€82.97
GF Value