Shares of National were losing 95 cents , or 3.9 % , to $ 23.73 in afternoon New York Stock Exchange trading .
Shares of National were losing 95 cents , or 3.9 % , to $ 23.73 in afternoon New York Stock Exchange trading .
Walgreen 's shares were up 4.6 % , or $ 1.42 , to $ 32.11 in midday New York Stock Exchange trading .