InvestorLens

MDY — SPDR S&P MIDCAP 400 ETF TR

Public company

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For educational research only.InvestorLens analyzes public regulatory filings (SEC EDGAR, STOCK Act PTRs) that may be delayed by 45 days or more. Information shown is historical and is not financial, legal, or tax advice, nor a recommendation or solicitation to buy or sell any security. Always do your own research.

InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.

Sourced from SEC EDGAR public filings

About SPDR S&P MIDCAP 400 ETF TR (MDY)

SPDR S&P MIDCAP 400 ETF TR (MDY) appears in the most recent 13F filings of 3 tracked institutional investors. The largest disclosed position is held by Ken Griffin (Citadel Advisors), valued at $217M. Across recent filings, tracked investors recorded 0 new positions, 1 increased, 0 reduced, and 1 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in MDY

50
/100
Mixed Activity
Added / Increased1
Reduced0
Exited1
BearishBullish
Crowded Trade Score™

How many top investors track MDY

20
/100
Emerging Interest
3investors

A small number of top investors own this.

UndiscoveredCrowded
151015+

MDY Ownership Composition

How SPDR S&P MIDCAP 400 ETF TR is held across tracked investor types, based on reported 13F positions.

Dominant Type
Other
96% of tracked value
Institutions
3
tracked investors
Total Reported
$254M
combined 13F value
Sectors2
  • Other96.3%
  • Hedge Funds3.7%
Other(2)
96.3%
Hedge Funds(1)
3.7%

Tracked investors reporting MDY

  • Ken GriffinMar 31, 2026
    Citadel Advisors
    Shares
    352.5K
    Value
    $217.4M
    % Portfolio
    0.04%
  • Izzy EnglanderMar 31, 2026
    Millennium Management
    Shares
    44.2K
    Value
    $27.3M
    % Portfolio
    0.01%
  • Steve CohenDec 31, 2025
    Point72 Asset Management
    Shares
    15.4K
    Value
    $9.3M
    % Portfolio
    0.01%

Recent activity

Frequently asked questions

How many institutional investors hold MDY?
3 tracked institutional investors disclosed a position in MDY (SPDR S&P MIDCAP 400 ETF TR) in their most recent 13F filing.
Who is the largest institutional holder of MDY?
Ken Griffin, Citadel Advisors, holds the largest disclosed position in MDY, valued at $217M.
Did institutional ownership of MDY increase or decrease?
Across recent 13F filings, tracked investors recorded 0 new positions, 1 increased, 0 reduced, and 1 fully exited MDY.
Where does this MDY ownership data come from?
SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.
MDY (SPDR S&P MIDCAP 400 ETF TR) — Institutional Holders & — InvestorLens