Total US-listed ETF Assets reached $3.45 trillion at the end of Q1 2018, a 22.9% year-over-year increase.  Total estimated net asset flows in Q1 2018 totaled $66 billion, a 50% drop from the prior quarter, marking the slowest quarter for total estimated net inflows since Q2 of 2016.

International Equity ETFs received the strongest estimated net inflows in Q1 2018, totaling $33 billion, only slightly less than the prior quarter.  Year-over-year, International Equity ETF assets increased by over 43%.

Taxable Bond ETFs received the second highest estimated net inflows with $15 billion, bringing the category's year-over-year increase in total assets to 20%.

Sector Equity ETFs received $10 billion in estimated net inflows, increasing year-over-year assets by 14%, while the broader US Equity ETFs category received $1.3 billion in estimated net inflows, increasing year-over-year assets by 19%.

Commodities ETFs and Alternatives ETFs, which received $2.5 billion and $3.1 billion in estimated net inflows, respectively, were the only two categories that had greater estimated net inflows in Q1 2018 than the prior quarter.