Ticker · held by 4 filers

MASS

908 Devices Inc

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

Total value held

$21.8M

Total shares

4,188,263

Filers holding

4 · 5 positions

Caveat

long only · 13F-eligible managers only

Filers holding MASS

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

# Filer Class Shares Value (USD) % of port

1 ARK Invest · Cathie Wood Common Stock 1,985,986 $10.4M 0.07%

2 BlackRock · Larry Fink COM 1,693,204 $8.7M 0.00%

3 Citadel Advisors · Ken Griffin COM 264,373 $1.4M 0.00%

4 Renaissance Technologies · Jim Simons (founder) COM 222,100 $1.2M 0.00%

5 Citadel Advisors · Ken Griffin CALLCOM 22,600 $118.7K 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 MASS 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