Ticker · held by 3 filers

MRK

MERCK & CO INC

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

Total value held

$27.29B

Total shares

222,619,769

Filers holding

3 · 7 positions

Caveat

long only · 13F-eligible managers only

Filers holding MRK

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

# Filer Class Shares Value (USD) % of port

1 BlackRock · Larry Fink COM 207,295,317 $25.66B 0.58%

2 Citadel Advisors · Ken Griffin COM 6,821,331 $718.0M 0.11%

3 Citadel Advisors · Ken Griffin PUTCOM 3,900,600 $410.6M 0.06%

4 Citadel Advisors · Ken Griffin CALLCOM 3,377,900 $355.6M 0.05%

5 BlackRock · Larry Fink PUTOPTIONS 651,000 $80.6M 0.00%

6 Bridgewater Associates · Ray Dalio (founder) COM 310,221 $32.7M 0.12%

7 BlackRock · Larry Fink CALLOPTIONS 263,400 $32.6M 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 MRK 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