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 2023Matrix Advisors Value FundSell-65,630$2,696,426
Q1 2023Sequoia Financial AdvisorsSell-271,360$623,438
Q1 2023Matrix Advisors Value FundBuy385,636$2,583,519
Q4 2022Renaissance Technologies LLCBuy2,3004,200$1,860
Q4 2022Sequoia Financial AdvisorsBuy681,387$614,150
Q4 2022Matrix Advisors Value FundSell-1675,598$2,478,811
Q3 2022Renaissance Technologies LLCSell-1,2001,900$763
Q3 2022Matrix Advisors Value FundSell-415,765$2,316
Q2 2022Renaissance Technologies LLCSell-3,7003,100$1,282
Q2 2022Matrix Advisors Value FundBuy275,806$2,401
Q1 2022Sequoia Financial AdvisorsSell-1691,319$647
Q1 2022Matrix Advisors Value FundBuy2385,779$2,835
Q1 2022Renaissance Technologies LLCSell-6,6006,800$3,335
Q4 2021Sequoia Financial AdvisorsBuy3311,488$770
Q4 2021Matrix Advisors Value FundBuy935,541$2,868
Q3 2021Matrix Advisors Value FundBuy1595,448$2,620
Q2 2021Sequoia Financial AdvisorsSell-501,157$568
Q2 2021Matrix Advisors Value FundBuy1045,289$2,597
Q2 2021Renaissance Technologies LLCBuy10,80013,400$6,580
Q1 2021Mairs & Power Growth FundSell-97437$208
Q1 2021Matrix Advisors Value FundBuy6565,185$2,468
Q4 2020Mairs & Power Growth FundSell-245534$224
Q3 2020Mairs & Power Growth FundBuy25779$264
Q3 2020Sequoia Financial AdvisorsBuy1,2071,207$409
Q2 2020Mairs & Power Growth FundSell-326754$245
Q2 2020Sequoia Financial AdvisorsSell-1,1970$388
Q2 2020Renaissance Technologies LLCBuy1,9002,600$844
Q1 2020Sequoia Financial AdvisorsSell-3001,197$315
Q4 2019Sequoia Financial AdvisorsSell-791,497$562
Q3 2019Renaissance Technologies LLCSell-1,200700$247

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.