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MDY · Spdr S&P Midcap 400 ETF Trust

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$690.48 -8.13 (-1.16%) At close · Aug 28

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 1,512
Total Value: $17,864,277,567
Total Shares: 25,462,655
Showing 1–100 of 1,530 holdings by value · page 1 of 16

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 1,512 13F filers · Δ vs Mar 31, 2026
Top Holder
7.7%
Sep 2023 → Jun 2026 · range 7.5% – 9.6%
−0.2 pts
Top 5
25.1%
Sep 2023 → Jun 2026 · range 24.4% – 30.5%
−1.2 pts
Top 10
40.9%
Sep 2023 → Jun 2026 · range 38.9% – 44.6%
−0.6 pts
HHI
221
Sep 2023 → Jun 2026 · range 214 – 277
Broadly held−10

Quarterly Activity

vs Mar 31, 2026
New
147
Increased
343
Decreased
532
Sold Out
91
Unchanged
490
Holder count: +56
Institutional value: +11.8%
Shares held: -2.0%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 1,530
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 936958 CUSIP 78467Y107 13F (30d) 855 filings 842 filers