Wrong closing prices
Some "closing" prices are from the second preceding business day, not the immediate preceding business day. It is IMPERATIVE that ALL prices on your service be accurate.
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William J Greene commented
Not only is the Price Data within a Portfolio not consistent. It is not even consistent if you bring up the Summary Page for a SINGLE STOCK!! Hit the Refresh button 5 times and on some stocks the price will bounce from one price to another and back again. What is the correct Price? Will you please fix this mess.