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Aetna Inc (NYSE:AET)
Shiller P/E Ratio
22.05 (As of Today)

As of today, Aetna Inc's current share price is $102.75. Aetna Inc's E10 for the quarter that ended in Sep. 2015 was $4.66. Aetna Inc's Shiller P/E Ratio for today is 22.05.

AET' s 10-Year Shiller P/E Ratio Range
Min: 10.45   Max: 67.75
Current: 22.08


During the past 13 years, Aetna Inc's highest Shiller P/E Ratio was 67.75. The lowest was 10.45. And the median was 18.71.

AET's Shiller P/E Ratiois ranked higher than
79% of the 14 Companies
in the Global Health Care Plans industry.

( Industry Median: 30.77 vs. AET: 22.08 )

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 Sep. 2015 was $1.590. Add all the adjusted EPS for the past 10 years together and divide 10 will get our E10, which is $4.66 for the trailing ten years ended in Sep. 2015.


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 own currency.

Aetna Inc's E10 for the fiscal year that ended in Dec14 is calculated as:

For example, Aetna Inc's adjusted earnings per share data for the three months ended in Sep. 2015 was:

Adj_EPS=Earnigns per Share/CPI of Sep. 2015 (Change)*Current CPI (Sep. 2015)

Current CPI (Sep. 2015) = 237.945.

Aetna Inc Quarterly Data

per share eps 1.4901.3800.9961.8201.5201.6700.6552.2002.0801.590
CPI 233.504234.149233.049236.293238.343238.031234.812236.119238.638237.945
Adj_EPS 1.5181.4021.0171.8331.5171.6690.6642.2172.0741.590
per share eps 0.5351.5001.3901.3001.0191.4301.3201.4700.5621.480
CPI 219.179223.467225.722226.889225.672229.392229.478231.407229.601232.773
Adj_EPS 0.5811.5971.4651.3631.0741.4831.3691.5120.5821.513
per share eps 0.9700.5800.4160.9500.7700.7300.3761.2801.1401.190
CPI 218.815218.783210.228212.709215.693215.969215.949217.631217.965218.439
Adj_EPS 1.0550.6310.4711.0630.8490.8040.4141.3991.2441.296
per share eps 0.6900.6800.6700.8500.8040.8100.8500.9500.8690.850
CPI 196.800199.800202.900202.900201.800205.352208.352208.490210.036213.528
Adj_EPS 0.8340.8100.7860.9970.9480.9390.9711.0840.9840.947

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 own currency.

Aetna Inc Annual Data

ShillerPE 55.0039.5844.2820.2920.1215.2916.1912.6016.7520.87

Aetna Inc Quarterly Data

ShillerPE 16.0815.8216.7517.6518.4918.8620.8724.2227.8823.50
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