Crude oil prices of more than $100 a barrel are boosting stock prices in the petroleum sector, but the effect on the S&P 500 is limited because the commodity accounts for fewer than 5% of the companies in the index.

Many portfolios are heavily invested in the S&P 500, so a lot of traders have very little exposure to the energy sector. Where should traders start if they want to gain more exposure to energies?

Here’s the lay of the land.

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