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MRK · Merck & Co., Inc. · Holdings

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$142.75 +0.81 (+0.57%)
Market Cap
$367.07B
Shares
2.47B
Volume · Oct 7 6.35M Avg daily vol (3M) 9.8M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Some SEC filings for this period have not finished importing. Holder totals and changes may be incomplete; these filings remain queued for recovery.
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 3,865
Total Value: $259,840,745,894
Total Shares: 2,021,880,179
Showing 1–100 of 3,953 holdings by value · page 1 of 40

Institutional Ownership Trend

28 quarters

Holder Concentration

Across 3,863 13F filers
Top Holder
11.2%
Sep 2023 → Jun 2026 · range 11.2% – 12.9%
of institutional value
Top 5
32.8%
Sep 2023 → Jun 2026 · range 32.8% – 36.9%
of institutional value
Top 10
45.3%
Sep 2023 → Jun 2026 · range 45.0% – 46.9%
of institutional value
HHI
315
Sep 2023 → Jun 2026 · range 315 – 389
Broadly held
Showing 100 of 3,953
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 310158 CUSIP 58933Y105 13F (30d) 140 filings 86 filers Visit website Investor relations