Usually reinvested stock goes through Shareholder Services, and they will also send you a 1099 every year if the stock is still earning dividends. so first find out if your grandmother is receiving a 1099B and also check to see if the company still exists. it may have gone under, or been taken over by another company. If it is still around, google Shareholder services, and call them with her social, they will find out for you. I just settled my aunt's estate and had a similar situation.