I'm really puzzled about the pricing I'm seeing for symbols like TMF, TQQQ. These are etf's that should not be affected by stock splits,
yet their pricing varies significantly (by 50% -70%) of the results I see in charting packages like Yahoo or Stockcharts.
Look at the following, which maps the effect of owning 100% of TMF versus the default of SPY, and records the prices of TMF below it. In July 2016, TMF suffered badly according to stockcharts , dropping from a high of about $31.58 to a low of around $16.24. But that's nothing compared to what Quantopian data records: Q shows these prices to drop from $121.05 to lows of $17.04. So they both end up at around the same price but the starting number diverges drastically.
Can anybody explain this to me?