SPDR S&P MIDCAP 400 ETF TRST (MDY) Institutional Ownership Changes & 13F Activity

SPDR S&P MIDCAP 400 ETF TRST (MDY) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Renaissance Technologies LLC, Sequoia Financial Advisors, Mairs & Power Growth Fund, and Matrix Advisors Value Fund.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2026Renaissance Technologies LLCBuy7,52012,720$7,845,187
Q1 2026Sequoia Financial AdvisorsBuy8692,316$1,428,695
Q1 2026Mairs & Power Growth FundSell-245819$505,203
Q1 2026Matrix Advisors Value FundSell-1375,979$3,687,642
Q4 2025Matrix Advisors Value FundBuy1396,116$3,690,067
Q4 2025Sequoia Financial AdvisorsSell-341,447$873,160
Q3 2025Renaissance Technologies LLCBuy1,5005,200$3,099,356
Q3 2025Matrix Advisors Value FundSell-2235,977$3,562,825
Q3 2025Mairs & Power Growth FundBuy1991,064$634,250
Q3 2025Sequoia Financial AdvisorsBuy1091,481$882,886
Q2 2025Renaissance Technologies LLCSell-9,8003,700$2,095,976
Q2 2025Matrix Advisors Value FundSell-2696,200$3,512,194
Q2 2025Mairs & Power Growth FundSell-170865$490,005
Q2 2025Sequoia Financial AdvisorsBuy541,372$777,305
Q1 2025Renaissance Technologies LLCSell-3,70013,500$7,201,980
Q1 2025Matrix Advisors Value FundSell-976,469$3,451,457
Q1 2025Sequoia Financial AdvisorsSell-581,318$703,172
Q4 2024Renaissance Technologies LLCBuy11,40017,200$9,796,776
Q4 2024Mairs & Power Growth FundBuy2001,035$589,515
Q4 2024Sequoia Financial AdvisorsBuy531,376$783,743
Q4 2024Matrix Advisors Value FundBuy526,566$3,739,814
Q3 2024Matrix Advisors Value FundBuy1,2486,514$3,711,023
Q3 2024Mairs & Power Growth FundSell-150835$475,666
Q3 2024Sequoia Financial AdvisorsBuy41,323$753,661
Q2 2024Mairs & Power Growth FundBuy548985$527,054
Q2 2024Sequoia Financial AdvisorsSell-201,319$705,771
Q2 2024Matrix Advisors Value FundSell-95,266$2,818,000
Q1 2024Sequoia Financial AdvisorsSell-8741,339$745,020
Q1 2024Matrix Advisors Value FundSell-2245,275$2,935,223
Q4 2023Sequoia Financial AdvisorsBuy8872,213$1,122,832

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.

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