Ticker · held by 3 filers

XBI

SPDR SERIES TRUST

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

Total value held

$811.5M

Total shares

6,763,411

Filers holding

3 · 4 positions

Caveat

long only · 13F-eligible managers only

Filers holding XBI

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

# Filer Class Shares Value (USD) % of port

1 Citadel Advisors · Ken Griffin PUTSTATE STREET SPD 3,620,900 $441.5M 0.07%

2 Citadel Advisors · Ken Griffin CALLSTATE STREET SPD 2,650,000 $323.1M 0.05%

3 BlackRock · Larry Fink S&P BIOTECH 451,411 $41.9M 0.00%

4 Renaissance Technologies · Jim Simons (founder) STATE STREET SPD 41,100 $5.0M 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 XBI 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