Ticker · held by 3 filers

INSM

INSMED INC

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

Total value held

$1.28B

Total shares

16,099,390

Filers holding

3 · 5 positions

Caveat

long only · 13F-eligible managers only

Filers holding INSM

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

# Filer Class Shares Value (USD) % of port

1 BlackRock · Larry Fink COM PAR $.01 14,264,495 $955.7M 0.02%

2 Citadel Advisors · Ken Griffin COM PAR $.01 1,157,295 $201.4M 0.03%

3 Citadel Advisors · Ken Griffin CALLCOM PAR $.01 432,900 $75.3M 0.01%

4 Citadel Advisors · Ken Griffin PUTCOM PAR $.01 218,800 $38.1M 0.01%

5 Renaissance Technologies · Jim Simons (founder) COM PAR $.01 25,900 $4.5M 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 INSM 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