I bought some nasdaq shares on London Stock Exchange's International Retail Service (IRS) Thinking that they were identical to the USA equivilant. This turned out not to be the case as a comparison of Pixr.l(london) and pixr(nasdaq) shows
Campbell
One is quoted in £, and the other in $, so there is exchange fluctuation involved here.
Also, there was a stock split in April, and perhaps one of the graphs is not taking this into account.
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