The objective of the State Street SPDR S&P 400 US Mid Cap UCITS ETF is to track the performance of mid-sized US companies. It aims to do this by tracking the performance of the S&P MidCap 400 Index as closely as possible. The S&P MidCap 400 Index is a float-adjusted, capitalisation weighted index of 400 securities, providing investors with a benchmark for mid-sized US companies. The Index covers approximately 7% of the total US equity market and seeks to remain an accurate measure of mid-sized US companies, reflecting the risk and return characteristics of the broader mid-cap universe on an on-going basis.