Institutional Interest in Virtus Seix Senior Loan ETF Rises Institutional investors, including Atria Investments and Flow Traders U.S. LLC, have significantly increased their holdings in Virtus Seix Senior Loan ETF. Notably, Flow Traders boosted its position by 130.5% in Q3 2024. The ETF is gaining traction for its focus on noninvestment-grade, floating-rate loans.1