SPDR S&P MidCap 400 ETF Trust makes up 6.1% of Tiller Private Wealth Inc.’s investment portfolio, making the stock its 6th biggest position. Get SPDR S&P MidCap 400 ETF Trust alerts:SPDR S&P MidCap 400 ETF Trust Stock Up 1.0%Shares of NYSEARCA MDY opened at $596.68 on Friday. SPDR S&P MidCap 400 ETF Trust ProfileSPDR S&P MidCap 400 ETF is an exchange traded fund. SPDR MidCap 400 Trust focuses to correspond to the price and yield performance of the S&P MidCap 400 Index. Receive News & Ratings for SPDR S&P MidCap 400 ETF Trust Daily - Enter your email address below to receive a concise daily summary of the latest news and analysts' ratings for SPDR S&P MidCap 400 ETF Trust and related companies with MarketBeat.com's FREE daily email newsletter.