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Aetna Inc (NYSE:AET)
Shiller PE Ratio
31.22 (As of Today)

As of today, Aetna Inc's current share price is $152.98. Aetna Inc's E10 for the quarter that ended in Mar. 2017 was $4.90. Aetna Inc's Shiller P/E Ratio for today is 31.22.

AET' s Shiller PE Ratio Range Over the Past 10 Years
Min: 10.39   Max: 44.8
Current: 31.22


During the past 13 years, Aetna Inc's highest Shiller P/E Ratio was 44.80. The lowest was 10.39. And the median was 19.05.

AET's Shiller PE Ratio is ranked lower than
69% of the 13 Companies
in the Global Health Care Plans industry.

( Industry Median: 27.59 vs. AET: 31.22 )

E10 is a concept invented by Prof. Robert Shiller, who uses E10 for his Shiller P/E calculation. E10 is the average of the inflation adjusted earnings of a company over the past 10 years.

Aetna Inc's adjusted earnings per share data for the three months ended in Mar. 2017 was $-1.110. Add all the adjusted EPS for the past 10 years together and divide 10 will get our E10, which is $4.90 for the trailing ten years ended in Mar. 2017.


For the Shiller P/E, the earnings of the past 10 years are inflation-adjusted and averaged. The result is used for P/E calculation. Since it looks at the average over the last 10 years, the Shiller P/E is also called PE10.

The Shiller P/E was first used by professor Robert Shiller to measure the valuation of the overall market. The same calculation is applied here to individual companies.

Aetna Inc's Shiller P/E Ratio for today is calculated as

Shiller P/E Ratio=Share Price/E10

* All numbers are in millions except for per share data and ratio. All numbers are in their local exchange's currency.

Aetna Inc's E10 for the fiscal year that ended in Dec16 is calculated as:

For example, Aetna Inc's adjusted earnings per share data for the three months ended in Mar. 2017 was:

Adj_EPS=Earnigns per Share/CPI of Mar. 2017 (Change)*Current CPI (Mar. 2017)

Current CPI (Mar. 2017) = 243.801.

Aetna Inc Quarterly Data

per share eps 0.6702.2002.0801.5900.9102.0802.2301.7000.390-1.110
CPI 234.812236.119238.638237.945236.525238.132241.018241.428241.432243.801
Adj_EPS 0.6962.2722.1251.6290.9382.1302.2561.7170.394-1.110
per share eps 1.3201.4700.5801.4801.4901.3800.9801.8201.5201.670
CPI 229.478231.407229.601232.773233.504234.149233.049236.293238.343238.031
Adj_EPS 1.4021.5490.6161.5501.5561.4371.0251.8781.5551.710
per share eps 0.3801.2801.1401.1900.5701.5001.3901.3001.0301.430
CPI 215.949217.631217.965218.439219.179223.467225.722226.889225.672229.392
Adj_EPS 0.4291.4341.2751.3280.6341.6361.5011.3971.1131.520
per share eps 0.8500.9500.8600.8500.9700.5800.4300.9500.7700.730
CPI 208.352208.490210.036213.528218.815218.783210.228212.709215.693215.969
Adj_EPS 0.9951.1110.9980.9711.0810.6460.4991.0890.8700.824

Add all the adjusted EPS together and divide 10 will get our E10.


Compared with the regular P/E ratio, which works poorly for cyclical businesses, the Shiller P/E smoothed out the fluctuations of profit margins during business cycles. Therefore it is more accurate in reflecting the valuation of the company.

If a company has consistent business performance, the Shiller P/E should give similar results to regular P/E.

Compared with the P/S ratio, the Shiller P/E makes the comparison between different industries more meaningful.

Be Aware

The Shiller P/E assumes that over the long term, businesses and profitability revert to their means. If a company’s business model does not work in the future compared with the past, the Shiller P/E and P/S ratio will give false valuations.

Related Terms

P/E Ratio, P/B Ratio, P/S Ratio, Price-to-Free-Cash-Flow ratio, E10

Historical Data

* All numbers are in millions except for per share data and ratio. All numbers are in their local exchange's currency.

Aetna Inc Annual Data

ShillerPE 43.2019.7819.5214.9516.1112.5316.6820.8023.3424.76

Aetna Inc Quarterly Data

ShillerPE 20.8024.1427.8123.4323.3423.3924.4522.8024.7626.03
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