MERCK & CO INC (MRK): Institutional Ownership
Hedge funds and institutional managers reporting a position in MRK · Health Care. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.
Reported Holders
35
13F filers
Aggregate Value
$7.9B
Across holders
Last Price
$128.66
2026-06-26
Sector
Health Care
GICS
Holder activity7 new10 added18 reduced
| Manager⇅ | Type⇅ | Shares⇅ | Market Value▼ | % of Total⇅ | % of Portfolio⇅ | Action⇅ | QoQ Change⇅ | Quarter⇅ |
|---|---|---|---|---|---|---|---|---|
| Fisher Asset Management, LLC CIK 0000850529 | Institutional Manager | 26.44M | $3.2B | 40.5% | 1.1% | Added | +$188.0M | Q1 2026 |
| HARRIS ASSOCIATES L P CIK 0000813917 | Institutional Manager | 11.94M | $1.4B | 18.3% | 1.9% | Reduced | $-200.5M | Q1 2026 |
| AQR CAPITAL MANAGEMENT LLC CIK 0001167557 | Hedge Fund | 8.33M | $1.0B | 12.8% | 0.5% | Added | +$987.5M | Q1 2026 |
| Grantham, Mayo, Van Otterloo & Co. LLC CIK 0001352662 | Institutional Manager | 7.01M | $843.7M | 10.7% | 2.2% | Added | +$17.3M | Q1 2026 |
| CITADEL ADVISORS LLC CIK 0001423053 | Hedge Fund | 3.74M | $450.3M | 5.7% | 0.1% | Reduced | $-18.9M | Q1 2026 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. CIK 0001165408 | Hedge Fund | 2.69M | $323.3M | 4.1% | 0.5% | Reduced | $-49K | Q1 2026 |
| Hudson Bay Capital Management LP CIK 0001393825 | Hedge Fund | 800K | $96.2M | 1.2% | 0.3% | Added | +$96.0M | Q1 2026 |
| Man Group plc CIK 0001637460 | Hedge Fund | 788K | $94.8M | 1.2% | 0.2% | Added | +$94.1M | Q1 2026 |
| Holocene Advisors, LP CIK 0001700574 | Hedge Fund | 572K | $68.9M | 0.9% | 0.2% | Reduced | $-37.7M | Q1 2026 |
| TUDOR INVESTMENT CORP ET AL CIK 0000923093 | Hedge Fund | 512K | $61.6M | 0.8% | 0.1% | Added | +$33.7M | Q1 2026 |
| Gotham Asset Management, LLC CIK 0001510387 | Hedge Fund | 507K | $60.9M | 0.8% | 0.2% | Added | +$7.1M | Q1 2026 |
| Qube Research & Technologies Ltd CIK 0001729829 | Hedge Fund | 313K | $37.6M | 0.5% | 0.0% | Reduced | $-59.6M | Q1 2026 |
| Bridgewater Associates, LP CIK 0001350694 | Hedge Fund | 310K | $32.7M | 0.4% | 0.1% | Reduced | $-21.4M | Q4 2025 |
| CAXTON ASSOCIATES LLP CIK 0002051323 | Hedge Fund | 250K | $26.3M | 0.3% | 0.5% | New | — | Q4 2025 |
| Walleye Capital LLC CIK 0001758720 | Hedge Fund | 175K | $21.0M | 0.3% | 0.1% | Reduced | $-19.9M | Q1 2026 |
| ExodusPoint Capital Management, LP CIK 0001736225 | Hedge Fund | 145K | $17.4M | 0.2% | 0.1% | Reduced | $-2.1M | Q1 2026 |
| STEADFAST CAPITAL MANAGEMENT LP CIK 0001214822 | Hedge Fund | 157K | $16.5M | 0.2% | 0.3% | New | — | Q4 2025 |
| DODGE & COX CIK 0000200217 | Institutional Manager | 136K | $16.4M | 0.2% | 0.0% | Reduced | $-259K | Q1 2026 |
| RENAISSANCE TECHNOLOGIES LLC CIK 0001037389 | Hedge Fund | 140K | $11.1M | 0.1% | 0.0% | New | — | Q2 2025 |
| GAMCO INVESTORS, INC. ET AL CIK 0000807249 | Institutional Manager | 65K | $7.8M | 0.1% | 0.1% | Reduced | $-25K | Q1 2026 |
Added
Institutional Manager
$3.2B· 40.5% of total· 1.1% port· 26.44M sh· +$188.0M QoQ· Q1 2026
Reduced
Institutional Manager
$1.4B· 18.3% of total· 1.9% port· 11.94M sh· $-200.5M QoQ· Q1 2026
Added
Hedge Fund
$1.0B· 12.8% of total· 0.5% port· 8.33M sh· +$987.5M QoQ· Q1 2026
Added
Institutional Manager
$843.7M· 10.7% of total· 2.2% port· 7.01M sh· +$17.3M QoQ· Q1 2026
Reduced
Hedge Fund
$450.3M· 5.7% of total· 0.1% port· 3.74M sh· $-18.9M QoQ· Q1 2026
Reduced
Hedge Fund
$323.3M· 4.1% of total· 0.5% port· 2.69M sh· $-49K QoQ· Q1 2026
Added
Hedge Fund
$96.2M· 1.2% of total· 0.3% port· 800K sh· +$96.0M QoQ· Q1 2026
Added
Hedge Fund
$94.8M· 1.2% of total· 0.2% port· 788K sh· +$94.1M QoQ· Q1 2026
Reduced
Hedge Fund
$68.9M· 0.9% of total· 0.2% port· 572K sh· $-37.7M QoQ· Q1 2026
Added
Hedge Fund
$61.6M· 0.8% of total· 0.1% port· 512K sh· +$33.7M QoQ· Q1 2026
Added
Hedge Fund
$60.9M· 0.8% of total· 0.2% port· 507K sh· +$7.1M QoQ· Q1 2026
Reduced
Hedge Fund
$37.6M· 0.5% of total· 0.0% port· 313K sh· $-59.6M QoQ· Q1 2026
Reduced
Hedge Fund
$32.7M· 0.4% of total· 0.1% port· 310K sh· $-21.4M QoQ· Q4 2025
New
Hedge Fund
$26.3M· 0.3% of total· 0.5% port· 250K sh· — QoQ· Q4 2025
Reduced
Hedge Fund
$21.0M· 0.3% of total· 0.1% port· 175K sh· $-19.9M QoQ· Q1 2026
Reduced
Hedge Fund
$17.4M· 0.2% of total· 0.1% port· 145K sh· $-2.1M QoQ· Q1 2026
New
Hedge Fund
$16.5M· 0.2% of total· 0.3% port· 157K sh· — QoQ· Q4 2025
Reduced
Institutional Manager
$16.4M· 0.2% of total· 0.0% port· 136K sh· $-259K QoQ· Q1 2026
New
Hedge Fund
$11.1M· 0.1% of total· 0.0% port· 140K sh· — QoQ· Q2 2025
Reduced
Institutional Manager
$7.8M· 0.1% of total· 0.1% port· 65K sh· $-25K QoQ· Q1 2026
Added
Hedge Fund
$7.7M· 0.1% of total· 0.0% port· 64K sh· +$6.1M QoQ· Q1 2026
Reduced
Hedge Fund
$6.2M· 0.1% of total· 0.0% port· 52K sh· $-119.2M QoQ· Q1 2026
Reduced
Hedge Fund
$5.6M· 0.1% of total· 0.0% port· 46K sh· $-9.4M QoQ· Q1 2026
Reduced
Institutional Manager
$4.3M· 0.1% of total· 0.0% port· 36K sh· $-253K QoQ· Q1 2026
Reduced
Hedge Fund
$4.2M· 0.1% of total· 0.0% port· 35K sh· $-6.3M QoQ· Q1 2026
Reduced
Hedge Fund
$3.4M· 0.0% of total· 0.0% port· 30K sh· $-38.3M QoQ· Q3 2024
New
Hedge Fund
$3.4M· 0.0% of total· 0.0% port· 43K sh· — QoQ· Q2 2025
New
Hedge Fund
$3.2M· 0.0% of total· 0.7% port· 28K sh· — QoQ· Q3 2024
Added
Hedge Fund
$2.7M· 0.0% of total· 0.2% port· 24K sh· +$6K QoQ· Q1 2026
New
Hedge Fund
$2.6M· 0.0% of total· 1.2% port· 24K sh· — QoQ· Q4 2025
Added
Hedge Fund
$2.0M· 0.0% of total· 0.0% port· 17K sh· +$1.3M QoQ· Q1 2026
Reduced
Hedge Fund
$1.9M· 0.0% of total· 0.0% port· 16K sh· $-261.2M QoQ· Q1 2026
New
Family Office
$1.1M· 0.0% of total· 0.0% port· 14K sh· — QoQ· Q2 2025
Reduced
Hedge Fund
$362K· 0.0% of total· 0.0% port· 3K sh· $-2.3M QoQ· Q1 2026
Reduced
Institutional Manager
$302K· 0.0% of total· 0.0% port· 3K sh· $-98K QoQ· Q1 2026
1–20 of 35
1 / 2