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How do dividend reinvestment purchases work?
Many brokers administer their own dividend reinvestment plans.  In this case, on dividend payment date, they automatically buy from the market on behalf of their reinvestment customers, and they administer all fractional shares across all customers.  All of your shares are in the broker's street name anyway, the fractional share is simply in their account system.   The process is well documented for several common online brokers; so any specific questions you may have about differences in policies or implementation should be directed to your broker:  https://us.etrade.com/e/t/estation/help?id=1301060000 https://www.tdameritrade.com/retail-en_us/resources/pdf/TDA208.pdf