In early trading on Monday, shares of Marathon Oil topped the list of the day's best performing components of the S&P 500 index, trading up 9.8%. Year to date, Marathon Oil has lost about 2.8% of its value.
And the worst performing S&P 500 component thus far on the day is Valero Energy, trading down 5.9%. Valero Energy is showing a gain of 7.3% looking at the year to date performance.
Two other components making moves today are American Airlines Group, trading down 5.6%, and Halliburton, trading up 9.3% on the day.
VIDEO: S&P 500 Movers: VLO, MRO
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