SPLG can be considered a miniature version of the infamous SPY ETF; albeit a few minor differences in structure and some other additional factors (available in the SPLG prospectus).1 However, these differences are not very relevant to long-term investors or short-term traders looking to make a strategic move in the S&P 500 Index (SPX). According to ETF Trends “SPLG is a cheaper, modernized S&P 500 alternative to the flagship SPDR S&P 500 ETF Trust (SPY).”2 SPLG has an expense ratio of 0.03% (compared to 0.09% for SPY).