SRLN's actively managed approach to the senior loan ETF space has been well received by investors. The fund has amassed a strong asset base since launch. SRLN aims to outperform the indexes underlying two competing ETFs, SNLN and BKLN, citing two possible means. First, it tries to anticipate which credits will be added and dropped from the indexes, buying and selling accordingly. Second, it isn't constrained to US firms. By design, SRLN allocates overwhelmingly to floating rate, below-investment-grade loans per issuer State Street Global Advisors. SRLN trades well with small spreads, though larger investors looking to trade blocks will have to work harder with market makers for good executions as the underlying senior loan market is generally less liquid. It charges a reasonable fee for the active management space, and with no underlying index, tracking isn't a concern.