Offer your thoughts or opinion on the input financial query or topic using your financial background.

Purchase same stock twice
Investors purchase additional shares all the time. Every investor that adds money to their investments does this every paycheck or every month. Investors do this every time they reinvest dividends, interest or capital gains. They also buy and sell shares when they decide to rebalance their portfolio.  Whether you are investing via a broker, mutual fund or ETF the investment company can handle this issue. You do want to know how they want you to specify which shares you want them to sell. The laws in your country may specify a default procedure, or what needs to be done if you want to use another procedure, or if you are allowed to change once you have specified a procedure.