Ticker · held by 2 filers

MDY

SPDR S&P MIDCAP 400 ETF TR

All tracked filers currently holding MDY, ranked by position size. Each row links through to the filer's full portfolio.

Total value held

$266.3M

Total shares

447,779

Filers holding

2 · 4 positions

Caveat

long only · 13F-eligible managers only

Filers holding MDY

sorted by position size · click any filer to see their full portfolio

# Filer Class Shares Value (USD) % of port

1 Citadel Advisors · Ken Griffin CALLUTSER1 S&PDCRP 311,700 $188.0M 0.03%

2 Citadel Advisors · Ken Griffin PUTUTSER1 S&PDCRP 79,200 $47.8M 0.01%

3 BlackRock · Larry Fink UTSER1 S&PDCRP 56,045 $30.0M 0.00%

4 Citadel Advisors · Ken Griffin UTSER1 S&PDCRP 834 $503.1K 0.00%

What this is

This page reverses the usual 13F view: instead of "what does Buffett hold," it answers "who holds NVDA?" Across the dozen tracked filers, all current 13F-disclosed holders of MDY are listed, with the position size and what fraction of each filer's overall portfolio it represents.

Caveats: only the filers tracked here are included (~12 names) — not the whole 13F universe (~6,000 filers). Position values are at the most recent quarter-end, not current market price. Only long positions are visible; shorts and synthetics aren't.

v0.2 · 2026 · data via SEC EDGAR · CUSIP→ticker via OpenFIGI