Merck & Co., Inc.
Merck & Co., Inc. (MRK) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MRK · as of Sep 30, 2024
Ownership Breakdown
3,595
Institutional Holders
▼ 41 vs Q2
$221.90B
Total Inst. Value
▼ $20.15B vs Q2
2.47B
Shares Outstanding
freeFloat 99.83%
1.96B
13F Shares Held
▲ 2.53M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MRK largest shareholders · institutional ownership
Q3 2024 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC pharmaceutical preparations | 249.80M | 9.87% | 9.87% | $28.37T | Nov 13, 2024 | ▲ 5.13M |
BLACKROCK, INC. pharmaceutical preparations | 212.06M | 8.38% | 8.38% | $24.08T | Nov 13, 2024 | NEW |
STATE STREET CORP pharmaceutical preparations | 119.03M | 4.70% | 4.70% | $13.61T | Nov 14, 2024 | ▲ 1.54M |
WELLINGTON MANAGEMENT GROUP LLP pharmaceutical preparations | 75.81M | 2.99% | 2.99% | $8.61T | Nov 14, 2024 | ▲ 3.33M |
GEODE CAPITAL MANAGEMENT, LLC pharmaceutical preparations | 59.16M | 2.34% | 2.34% | $6.70T | Nov 12, 2024 | ▲ 2.13M |
FMR LLC pharmaceutical preparations | 49.71M | 1.96% | 1.96% | $5.64T | Nov 13, 2024 | ▼ 947.0K |
MORGAN STANLEY pharmaceutical preparations | 44.39M | 1.75% | 1.75% | $5.04T | May 14, 2025 | ▲ 2.17M |
BANK OF AMERICA CORP /DE/ pharmaceutical preparations | 38.87M | 1.54% | 1.54% | $4.41T | Nov 14, 2024 | ▼ 412.1K |
NORGES BANK pharmaceutical preparations | 33.78M | 1.33% | 1.33% | $3.84T | Nov 12, 2025 | ▼ 26.0K |
JPMORGAN CHASE & CO pharmaceutical preparations | 27.29M | 1.08% | 1.08% | $3.10T | Dec 26, 2024 | ▼ 801.1K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2024 vs prior quarter
Q3 2024
26
Increased
+37.68M shares1
New Positions
first time holders22
Decreased
−19.63M shares0
Sold Out
fully exitedNet shares change (top 50)
+18.05M
+37.68M / −19.63M
Net new holders
+5
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MRK insider trading · insider activity
Source: SEC Form 4
40
Buy transactions
30
Sell transactions
1.33
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Warden Kathy J director | May 29, 2026 | Award | 1,853.1 | — | — | 17.9K | Form 4 ↗ |
Karsanbhai Surendralal Lanca director | May 29, 2026 | Award | 1,853.1 | — | — | 5.4K | Form 4 ↗ |
Coe Mary Ellen director | May 29, 2026 | Award | 1,853.1 | — | — | 31.8K | Form 4 ↗ |
THULIN INGE G director | May 29, 2026 | Award | 1,853.1 | — | — | 27.5K | Form 4 ↗ |
Seidman Christine E director | May 29, 2026 | Award | 1,853.1 | — | — | 21.2K | Form 4 ↗ |
RUSSO PATRICIA F director | May 29, 2026 | Award | 1,853.1 | — | — | 62.4K | Form 4 ↗ |
Rothman Paul director | May 29, 2026 | Award | 1,853.1 | — | — | 34.9K | Form 4 ↗ |
Mayo Stephen director | May 29, 2026 | Award | 1,853.1 | — | — | 14.8K | Form 4 ↗ |
LAVIZZO-MOUREY RISA J director | May 29, 2026 | Award | 1,853.1 | — | — | 17.7K | Form 4 ↗ |
GLOCER THOMAS H director | May 29, 2026 | Award | 1,853.1 | — | — | 110.9K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Merck & Co., Inc. (MRK) is primarily owned by institutional investors, who hold approximately 79.2% of total shares outstanding. Company insiders own approximately 0.17%, while retail and public investors account for the remaining 20.62%.
The largest institutional shareholder of Merck & Co., Inc. is VANGUARD GROUP INC, holding approximately 249.80 million shares — equal to 9.87% of outstanding shares — as of September 30, 2024.
A total of 3,595 institutional investors currently hold MRK stock, with a combined institutional value of approximately $221.90 billion as of the most recent 13F filing period.
Frequently asked questions
MRK ownershipMerck & Co., Inc. (MRK) is primarily owned by institutional investors, who hold approximately 79.2% of shares. The largest shareholder is VANGUARD GROUP INC with a 9.87% stake. Company insiders hold 0.17%. Data sourced from SEC Form 13F as of September 30, 2024.