Ticker · held by 3 filers

AMPH

AMPHASTAR PHARMACEUTICALS IN

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

Total value held

$258.7M

Total shares

6,728,248

Filers holding

3 · 4 positions

Caveat

long only · 13F-eligible managers only

Filers holding AMPH

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

# Filer Class Shares Value (USD) % of port

1 BlackRock · Larry Fink COM 5,942,524 $237.7M 0.01%

2 Renaissance Technologies · Jim Simons (founder) COM 544,700 $14.6M 0.02%

3 Citadel Advisors · Ken Griffin COM 228,724 $6.1M 0.00%

4 Citadel Advisors · Ken Griffin CALLCOM 12,300 $329.4K 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 AMPH 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