I asked PowerShares to explain the small coal weighting for this article and the last one, but didn't get an answer. I don't think uranium exposure is negative, but anyone interested in the fund needs to know the reasons behind this strategy.
Investors who use ETFs to build portfolios based on industries can manage volatility by rotating exposure. When the market appears vulnerable to a large decline, (for example, when the S&P 500 Index has breached its 200-day moving average) it makes sense to cut positions in coal, oil sands or alternative energy. When the market appears to be recovering, it's time to reinstate those stocks.
Coal stocks are going to be more volatile than large oil companies most of the time. As you manage your portfolio, keep in mind that this volatility will usually be good on the way up and bad on the way down.
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