Ticker · held by 4 filers

MBB

ISHARES TR

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

Total value held

$341.1M

Total shares

3,663,244

Filers holding

Caveat

long only · 13F-eligible managers only

Filers holding MBB

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

# Filer Class Shares Value (USD) % of port

1 BlackRock · Larry Fink MBS ETF 2,259,258 $207.4M 0.00%

2 Bridgewater Associates · Ray Dalio (founder) MBS ETF 1,375,400 $131.0M 0.48%

3 Citadel Advisors · Ken Griffin PUTMBS ETF 20,200 $1.9M 0.00%

4 Renaissance Technologies · Jim Simons (founder) MBS ETF 8,386 $798.5K 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 MBB 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