Assets in exchange-traded funds in the U.S. will double to $2 trillion by 2015, according to a new report from BNY Mellon and Strategic Insight. Non-traditional investment strategies, which currently comprise 30% of ETF assets, will drive most of this growth, the two companies said.

“The next wave of growth of ETFs is being driven by new asset classes, new indexes and new ways to use ETFs as tools for portfolio construction,” said Joseph Keenan, head of global exchange traded fund services at BNY Mellon. “The ever-increasing sophistication of these newly created ETFs can pose operational and distribution challenges for asset managers. However, with detailed planning and a focused strategy, a variety of innovating exchange-traded products can be brought to market to effectively meet investors’ needs.”

Loren Fox, senior research analyst at Strategic Insight and author of the report, added, “Non-traditional ETFs will continue to increase their share of the ETF market. Commodity, leveraged, inverse, actively managed and hedge-fund-like ETFs are among the non-traditional ETF types that should see market share growth.”