As the U.S. bull market extends, exchange traded fund investors should consider alternative strategies that may limit risks while still participating on any further upside potential.

Marie Dzanis, Head of Intermediary Distribution and Wealth for Northern Trust Asset Management’s FlexShares, pointed to ESG, fixed income, factor investing and behavioral finance as four areas that investors should be eyeing in 2018.

“The challenge is that it is very hard to get people to do things within their portfolios when you have a nine-year increase year-over-year positive market,” Dzanis said at the Inside ETFs 2018 conference.

Many investors would look at traditional, passive index-based ETFs that provide broad market exposure as an investment that is good enough to capture the solid growth of benchmark indices like the S&P 500 or the Nasdaq.

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