How many institutional investors hold MDY?

2 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 $316M.

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

Name: SPDR S&P MIDCAP 400 ETF TR (MDY) — Institutional Ownership
Creator: InvestorLens
License: https://www.sec.gov/about/website-policies

Public company

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

Why are billionaires buying MDY?

Built from public SEC filings and public economic data. Not a recommendation.

Confidence

Institutional Conviction

Net accumulation · 1 buying vs 0 selling last quarter

Macro Tailwind

Macro conditions are mixed for this sector

Why? — Evidence & Confidence ▾

Of 1 tracked investors who changed their MDY position last quarter, 1 bought and 0 sold (100% buy-side). Macro conditions are mixed for this sector (Macro Tailwind 56/100 in a Overheat regime).

Supporting evidence

+1 tracked investor added or increased positions last quarter (Ken Griffin)
+2 tracked investors reported holding MDY at their latest filing
+Macro Health is 56/100 in a Overheat regime — historically acceptable for this sectorsource

Contradicting evidence — always shown

−13F data is disclosed up to 45 days after quarter end — positions may have changed since

Know the limits

· 13F disclosure lag (up to 45 days)
· Tracked investors are a sample, not the whole market
· Sector regime fit is a historical average, not a guarantee

Every InvestorLens score shows its evidence — including what argues against it. Model conviction-v1 · generated 9/18/2026.

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 2 tracked institutional investors. The largest disclosed position is held by Ken Griffin (Citadel Advisors), valued at $316M. Across recent filings, tracked investors recorded 1 new positions, 1 increased, 0 reduced, and 0 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in MDY

100

/100

Strong Institutional Accumulation

Added / Increased2

Reduced0

Exited0

BearishBullish

Crowded Trade Score™

How many top investors track MDY

/100

Undiscovered

2investors

Only 2 tracked investors report this position.

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

Multi-Strategy / Quant

100% of tracked value

Institutions

tracked investors

Total Reported

$96.7M

combined 13F value

Multi-Strategy / Quant100.0%

Multi-Strategy / Quant(2)

100.0%

Tracked investors currently reporting MDY

2 tracked investors have since exited this position — listed separately below.

Investor	Firm	Shares	Market value	% of portfolio	As of
Ken Griffin	Citadel Advisors	134.9K	$94.9M	0.01%	Jun 30, 2026
Izzy Englander	Millennium Management	2.6K	$1.8M	0.00%	Jun 30, 2026

Ken GriffinJun 30, 2026
Citadel Advisors
Shares
134.9K
Value
$94.9M
% Portfolio
0.01%
Izzy EnglanderJun 30, 2026
Millennium Management
Shares
2.6K
Value
$1.8M
% Portfolio
0.00%

Previously held MDY

These investors reported MDY in an earlier quarter but not in their most recent 13F. Figures below are their last reported position, not a current holding.

Investor	Firm	Last reported shares	Value then	Last held
Steve Cohen	Point72 Asset Management	15.4K	$9.3M	Dec 31, 2025
Paul Tudor Jones	Tudor Investment Corp	11.6K	$6.6M	Jun 30, 2025

Recent activity

Investor	Action	Δ %	Current value	Filing date
Ken Griffin	New	—	$110.4K	Nov 14, 2025
Ken Griffin	Increased	111.52%	$236.3K	Feb 17, 2026

Ken Griffin
New
$110.4KNov 14, 2025
Ken Griffin
Increased
$236.3K(111.52%)Feb 17, 2026

Frequently asked questions

How many institutional investors hold MDY?: 2 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 $316M.
Did institutional ownership of MDY increase or decrease?: Across recent 13F filings, tracked investors recorded 1 new positions, 1 increased, 0 reduced, and 0 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.