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This valuation method assumes that the stock valuation will revert to its historical mean in terms of Price/Sales Ratio. The reason we use P/S Ratio instead of P/E Ratio or P/B Ratio is because Price/Sales Ratio is independent of profit margin, and can be applied to a broader range of situations.
Median P/S Value is calculated as trailing twelve months (TTM) revenue per share times 10-Year median P/S ratio. National Grid PLC's revenue per share for the trailing twelve months (TTM) ended in Sep. 2015 was $29.78. National Grid PLC's 10-Year median P/S ratio is 1.91. Therefore, the Median P/S Value for today is $49.93.
As of today, National Grid PLC's share price is $70.97. National Grid PLC's median P/S value is $49.93. Therefore, National Grid PLC's Price to Median P/S Value Ratio for today is 1.42.
During the past 13 years, the highest Price to Median P/S Value Ratio of National Grid PLC was 2.90. The lowest was 0.00. And the median was 0.93.
National Grid PLC's Median P/S Value for today is calculated as
|Median P/S Value||=||Total Annual Sales / Shares Outstanding||*||10-Year Median P/S Ratio|
|=||Revenue per Share (TTM)||*||10-Year Median P/S Ratio|
10-Year Median P/S Ratio is 1.91.
For company reported semi-annually, GuruFocus uses latest annual data as the TTM data. National Grid PLC's revenue per share for the trailing twelve months (TTM) ended in Sep. 2015 was $29.78.
It also assumes that over time the profit margin is constant. If a company increases its profit margin to a sustainable level, this value might under-estimate its value. If it has permanent declined profit margins, this may over-estimate the companys value.
National Grid PLC's Price to Median P/S Value Ratio for today is calculated as
|Price to Median P/S Value||=||Share Price||/||Median P/S Value|
National Grid PLC Annual Data
National Grid PLC Semi-Annual Data