Private company & closely held companies

Closely held companies includes companies which shares are not listed (Limited unlisted companies) & private ltd. companies. So the diff. btw Closely held & Private companies is that Closely held companies include both limited unlisted companies & private ltd. companies & as regards to shares of pvt. ltd. companies they come under the definition of securities as in Co. Act , 1956 u can find the word securities used everywhere for shares of pvt. ltd. co. also & for the word marketable used in SCA,1956 it means u can sell the shares or not & u can easily sell the shares of pvt. ltd. co. also