SPDR S&P MIDCAP 400 ETF TRST (MDY) Institutional Ownership and Insiders Activity

SPDR S&P MIDCAP 400 ETF TRST (MDY) is widely held by institutional investors, with 4 tracked firms reporting positions valued at approximately $13.47M based on SEC Form 13F filings for the quarter ended March 31, 2026.

Renaissance Technologies LLC is the largest disclosed holder, reporting approximately $7.85M in MDY holdings in its latest filing.

Institutional ownership among tracked investors remains highly concentrated, with Renaissance Technologies LLC representing the majority of disclosed value.