isatrader
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Thanks for the mention of stockcharts.com. I'll take a look there, should be very useful. I am amazed at the tracking error in some of those screen shots you sent. Especially with these being commodities (though my knowledge here is very basic)! It seems that the managers of the ETF are more important than the item they are tracking!?
Just had another look at charts, the oil one says "Fund" if this is a managed fund (not a tracker) then I can understand there being a big difference? Is the gas one also a managed fund?
I'll just do a quick response to your last question now as I'm working and reply more later.
There are various ETF structures. Some are based on derivatives, some have a manager that buys and sells stocks, or futures to try and track an index and some buy and sell physical commodities. The list is more extensive, but you get the idea I'm sure.
Commodities ETFs like oil and natural gas are based on futures contracts, which have to be rolled into the next months contract every month. This causes something they call contango which leads to price disparities with the spot price. Basically energy ETFs are flawed and also leveraged ETFs are flawed as they take a fee every day which gradually eats away at the price especially when the product gets range bound. So for example if you test the leveraged oil etf vs the standard oil etf you'll see what I mean as it doesn't give you 2x the performance and actually is more biased to the downside.