Ticker · held by 3 filers

MGNI

MAGNITE INC

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

Total value held

$159.5M

Total shares

11,587,533

Filers holding

3 · 5 positions

Caveat

long only · 13F-eligible managers only

Filers holding MGNI

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

# Filer Class Shares Value (USD) % of port

1 BlackRock · Larry Fink COM 9,699,628 $128.9M 0.00%

2 Citadel Advisors · Ken Griffin PUTCOM 760,200 $12.3M 0.00%

3 Citadel Advisors · Ken Griffin COM 544,318 $8.8M 0.00%

4 Citadel Advisors · Ken Griffin CALLCOM 438,200 $7.1M 0.00%

5 Bridgewater Associates · Ray Dalio (founder) COM 145,187 $2.4M 0.01%

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 MGNI 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