XLU includes a hefty 8.2% tilt toward Southern Co. and 7.6% to Dominion Resources.

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Investors may have also increased bets into the bond-esque utilities sector as a more conservative play on the equities market, following the FBI’s renewed probe into Democratic presidential runner Hillary Clinton’s private email correspondence.

The renewed political risk weighed on American’s perception of a Clinton presidency, which dragged on the equities market and added to uncertainty.

SEE MORE: Rate Sensitive Sector ETFs Suffer as Bond Yields Rise

The added equity volatility also slightly diminished bets of a Federal Reserve rate hike in December, which would further help support the bond-like utilities sector.

For more information on the utilities sector, visit our utilities category.

Utilities Select Sector SPDR