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MRK · Merck & Co., Inc.

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$152.55 +3.56 (+2.39%) At close · Aug 21
Market Cap
$376.37B
Shares
2.47B

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.

Holders: 3,783
Total Value: $258,634,876,938
Total Shares: 2,013,031,434
Showing 1–100 of 3,872 holdings by value · page 1 of 39

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 3,783 13F filers · Δ vs Mar 31, 2026
Top Holder
11.3%
Sep 2023 → Jun 2026 · range 11.3% – 12.9%
−0.2 pts
Top 5
32.9%
Sep 2023 → Jun 2026 · range 32.9% – 36.9%
−0.4 pts
Top 10
45.5%
Sep 2023 → Jun 2026 · range 45.0% – 46.9%
−0.7 pts
HHI
318
Sep 2023 → Jun 2026 · range 318 – 389
Broadly held−5

Quarterly Activity

vs Mar 31, 2026
New
207
Increased
1,619
Decreased
1,475
Sold Out
233
Unchanged
482
Holder count: -26
Institutional value: +9.0%
Shares held: +2.0%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 3,872
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 310158 CUSIP 58933Y105 13F (30d) 2866 filings 2768 filers Visit website Investor relations