A rising stock market has been having a positive effect on the values of certain types of profitable businesses which are commonly valued using widely recognised Price/Earnings ratios for relevant commercial sector indices.  Recent increases recorded with these ratios so far this year (to July 2013), are as follows:-

+ 38.68%   Industrial All Index
+ 29.18%   General Industrials Index
+ 28.76%   Industrial Engineering Index
+ 24.92%   Support Services Index
+ 28.78%   Software & Computer Services Index
+ 3.68%     Consumer Goods All Index
+ 24.62%   General Retailers (since March 2013)
+ 14.45%   Consumer Services All Index
+ 17.94%   Media Index

Further information on Valuation methods can be found at:-