SPDR S&P MIDCAP 400 ETF TRST (MDY) Stock Institutional Trading Activity


SPDR S&P MIDCAP 400 ETF TRST (MDY) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Matrix Advisors Value Fund, Renaissance Technologies LLC, Mairs & Power Growth Fund, and Sequoia Financial Advisors. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q2 2019Sequoia Financial AdvisorsSell-6501,576$559
Q2 2019Renaissance Technologies LLCSell-1,2001,900$674
Q2 2019Matrix Advisors Value FundBuy9934,529$1,606
Q1 2019Sequoia Financial AdvisorsSell-92,226$769
Q1 2019Matrix Advisors Value FundBuy1,3693,536$1,221
Q4 2018Sequoia Financial AdvisorsBuy3392,235$676
Q4 2018Renaissance Technologies LLCBuy7003,100$938
Q3 2018Sequoia Financial AdvisorsSell-141,896$697
Q3 2018Matrix Advisors Value FundSell-292,167$796
Q3 2018Renaissance Technologies LLCBuy2,4002,400$882
Q2 2018Sequoia Financial AdvisorsSell-2251,910$678
Q2 2018Matrix Advisors Value FundSell-922,196$780
Q1 2018Sequoia Financial AdvisorsSell-152,135$730
Q1 2018Matrix Advisors Value FundBuy272,288$782
Q4 2017Sequoia Financial AdvisorsBuy6142,150$743
Q4 2017Matrix Advisors Value FundSell-572,261$781
Q3 2017Matrix Advisors Value FundSell-402,318$756
Q2 2017Matrix Advisors Value FundBuy1302,358$749
Q1 2017Matrix Advisors Value FundBuy72,228$696
Q4 2016Matrix Advisors Value FundBuy222,221$670
Q3 2016Matrix Advisors Value FundSell-62,199$621
Q2 2016Mairs & Power Growth FundSell-5701,080$294
Q2 2016Sequoia Financial AdvisorsBuy1,5361,536$418
Q1 2016Mairs & Power Growth FundBuy5551,650$433
Q1 2016Matrix Advisors Value FundBuy102,205$579
Q4 2015Mairs & Power Growth FundSell-7001,095$278
Q4 2015Matrix Advisors Value FundBuy322,195$558
Q3 2015Mairs & Power Growth FundBuy1,7951,795$447
Q3 2015Matrix Advisors Value FundBuy1712,163$538
Q2 2015Matrix Advisors Value FundBuy1711,992$544

Frequently asked questions about MDY activity

  • Which institutional owners are buying MDY?

    Institutional owners buying MDY include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in MDY activity?

    "Buy" means an investor increased their reported position in MDY compared to the prior reporting period. This reflects growing exposure to SPDR S&P MIDCAP 400 ETF TRST (MDY) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in MDY increasing?

    Institutional interest in MDY can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.