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Adtran Inc (NAS:ADTN)
Shiller P/E Ratio
13.14 (As of Today)

As of today, Adtran Inc's current share price is $16.29. Adtran Inc's E10 for the quarter that ended in Sep. 2015 was $1.24. Adtran Inc's Shiller P/E Ratio for today is 13.14.

ADTN' s 10-Year Shiller P/E Ratio Range
Min: 11.59   Max: 43.53
Current: 13.1


During the past 13 years, Adtran Inc's highest Shiller P/E Ratio was 43.53. The lowest was 11.59. And the median was 22.03.

ADTN's Shiller P/E Ratiois ranked higher than
85% of the 96 Companies
in the Global Communication Equipment industry.

( Industry Median: 28.84 vs. ADTN: 13.10 )

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.

Adtran Inc's adjusted earnings per share data for the three months ended in Sep. 2015 was $0.140. Add all the adjusted EPS for the past 10 years together and divide 10 will get our E10, which is $1.24 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.

Adtran 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.

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

For example, Adtran 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.

Adtran Inc Quarterly Data

per share eps 0.1700.2800.2040.1700.2600.2100.1720.0600.0500.140
CPI 233.504234.149233.049236.293238.343238.031234.812236.119238.638237.945
Adj_EPS 0.1730.2850.2080.1710.2600.2100.1740.0600.0500.140
per share eps 0.5570.5200.5600.5600.4830.2000.3300.1500.0630.130
CPI 219.179223.467225.722226.889225.672229.392229.478231.407229.601232.773
Adj_EPS 0.6050.5540.5900.5870.5090.2070.3420.1540.0650.133
per share eps 0.3400.3500.2660.2400.3000.3400.2920.2900.4400.500
CPI 218.815218.783210.228212.709215.693215.969215.949217.631217.965218.439
Adj_EPS 0.3700.3810.3010.2680.3310.3750.3220.3170.4800.545
per share eps 0.4080.2100.2700.3300.2400.2400.2800.3100.2710.260
CPI 196.800199.800202.900202.900201.800205.352208.352208.490210.036213.528
Adj_EPS 0.4930.2500.3170.3870.2830.2780.3200.3540.3070.290

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.

Adtran Inc Annual Data

ShillerPE 36.1226.2822.5814.8921.2933.9823.5614.7420.2416.60

Adtran Inc Quarterly Data

ShillerPE 18.3119.7820.2418.3116.8415.4116.6014.4212.7011.74
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