Ticker · held by 2 filers

TNDM

TANDEM DIABETES CARE INC

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

Total value held

$495.4M

Total shares

13,274,906

Filers holding

2 · 4 positions

Caveat

long only · 13F-eligible managers only

Filers holding TNDM

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

# Filer Class Shares Value (USD) % of port

1 BlackRock · Larry Fink COM NEW 11,122,903 $448.1M 0.01%

2 Citadel Advisors · Ken Griffin COM NEW 2,088,603 $45.9M 0.01%

3 Citadel Advisors · Ken Griffin PUTCOM NEW 35,000 $769.3K 0.00%

4 Citadel Advisors · Ken Griffin CALLCOM NEW 28,400 $624.2K 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 TNDM 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