Ignore the history & Compare the last published quarter earnings.
ALUM – 31.03.2015 end quarter
EPS = 0.44
Forward Annualized EPS = 0.44 x 4 = 1.76
Current Trading Price = 18.50
PER = 18.30 / 1.76 = 10.51
ALUF – 31.03.2015 end quarter
EPS = 1.02
Forward Annualized EPS = 1.02 x 4 = 4.08
Current Trading Price = 45.00
PER = 45.00 / 4.08 = 11.02
LALU – 31.12.2014 end quarter
EPS = 3.30 (I have remove the 24 Mn one off Capital Gain)
Forward Annualized EPS = 3.30 x 4 = 13.20
Current Trading Price = 88.00
PER = 88.00 / 13.20 = 6.70
PARQ – 31.12.2014 end quarter
EPS = 2.52
Forward Annualized EPS = 2.52 x 4 = 10.08
Current Trading Price = 67.00
PER = 67.00 / 10.08 = 6.64
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Now decide, What is the mostly undervalued ?