its a zero sum game

if you buy SM stock, someone is selling it to you - he gets the money, you get the stock share.
same when you sell your SM stock, - someone (individual like you or institution) is buying it from you...they pay and you get the money. SM will not get a penny from those transaction....indirectly, that is. Kay if it happens that those buying transaction push the price up, then it will have effect sa ila company common share na they will benefit bisan wala cla kadawat sa money na imo gibayad sa share...
mao na na if you happen to buy a stock na gamay lang namalit or wala share holder na actively trading it, naa time it takes weeks to sell hehe
of course, all the money transactions will be handled by your broker.
naa mas lawom explanation pero simple is better hehe.