MRK
Merck & Co., Inc. · Healthcare · Drug Manufacturers - General
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2024
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 183 | 0 | 1.60B | $205.60B | +4 | −3 |
| Q1 2026 | 185 | +1 | 1.56B | $186.85B | +3 | −3 |
| Q4 2025 | 183 | 0 | 1.68B | $176.48B | +1 | — |
| Q3 2025 | 27 | 0 | 972.48M | $81.66B | +1 | −2 |
| Q2 2025 | 25 | 0 | 887.01M | $70.29B | +1 | −1 |
| Q1 2025 | 22 | -1 | 386.62M | $34.78B | — | −1 |
| Q4 2024 | 23 | -1 | 374.82M | $37.37B | — | −1 |
| Q3 2024 | 23 | +1 | 256.79M | $29.14B | +1 | — |
| Q2 2024 | 22 | — | 256.16M | $31.70B | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Wellington Management ✦ | 72.48M | — | $8.97B | 1.6% | n/c | 1 | SEC ↗ |
| 2 | Wellington Management ✦ | 72.48M | — | $8.97B | 1.6% | n/c | 1 | SEC ↗ |
| 3 | Wellington Management ✦ | 72.48M | — | $8.97B | 1.6% | n/c | 1 | SEC ↗ |
| 4 | Wellington Management ✦ | 72.48M | — | $8.97B | 1.6% | n/c | 1 | SEC ↗ |
| 5 | Wellington Management ✦ | 72.48M | — | $8.97B | 1.6% | n/c | 1 | SEC ↗ |
| 6 | Wellington Management ✦ | 72.48M | — | $8.97B | 1.6% | n/c | 1 | SEC ↗ |
| 7 | Wellington Management ✦ | 72.48M | — | $8.97B | 1.6% | n/c | 1 | SEC ↗ |
| 8 | Wellington Management ✦ | 72.48M | — | $8.97B | 1.6% | n/c | 1 | SEC ↗ |
| 9 | Wellington Management ✦ | 72.48M | — | $8.97B | 1.6% | n/c | 1 | SEC ↗ |
| 10 | Geode Capital Management ✦ (passive) | 57.02M | — | $7.04B | 0.6% | n/c | 1 | SEC ↗ |
| 11 | Geode Capital Management ✦ (passive) | 57.02M | — | $7.04B | 0.6% | n/c | 1 | SEC ↗ |
| 12 | Norges Bank ✦ (passive) | 33.81M | — | $4.19B | 0.6% | n/c | 1 | SEC ↗ |
| 13 | T. Rowe Price ✦ | 24.73M | — | $3.06B | 0.4% | n/c | 1 | SEC ↗ |
| 14 | T. Rowe Price ✦ | 24.73M | — | $3.06B | 0.4% | n/c | 1 | SEC ↗ |
| 15 | Capital World Investors ✦ | 15.27M | — | $1.89B | 0.3% | n/c | 1 | SEC ↗ |
| 16 | Fisher Asset Management ✦ | 14.27M | — | $1.77B | 0.8% | n/c | 1 | SEC ↗ |
| 17 | Millennium Management ✦ | 9.59M | — | $1.19B | 1.0% | n/c | 1 | SEC ↗ |
| 18 | Citadel Advisors ✦ | 8.24M | — | $1.02B | 1.0% | n/c | 1 | SEC ↗ |
| 19 | Citadel Advisors ✦ | 8.24M | — | $1.02B | 1.0% | n/c | 1 | SEC ↗ |
| 20 | Arrowstreet Capital ✦ | 6.21M | — | $768.45M | 0.7% | n/c | 1 | SEC ↗ |
| 21 | Adage Capital Partners ✦ | 3.17M | — | $392.59M | 0.7% | n/c | 1 | SEC ↗ |
| 22 | Marshall Wace ✦ | 2.58M | — | $319.92M | 0.5% | n/c | 1 | SEC ↗ |
| 23 | Marshall Wace ✦ | 2.58M | — | $319.92M | 0.5% | n/c | 1 | SEC ↗ |
| 24 | D. E. Shaw & Co. ✦ | 2.38M | — | $294.49M | 0.4% | n/c | 1 | SEC ↗ |
| 25 | D. E. Shaw & Co. ✦ | 2.38M | — | $294.49M | 0.4% | n/c | 1 | SEC ↗ |
| 26 | AQR Capital Management ✦ | 2.21M | — | $273.76M | 0.4% | n/c | 1 | SEC ↗ |
| 27 | AQR Capital Management ✦ | 2.21M | — | $273.76M | 0.4% | n/c | 1 | SEC ↗ |
| 28 | AQR Capital Management ✦ | 2.21M | — | $273.76M | 0.4% | n/c | 1 | SEC ↗ |
| 29 | AQR Capital Management ✦ | 2.21M | — | $273.76M | 0.4% | n/c | 1 | SEC ↗ |
| 30 | Bridgewater Associates ✦ | 1.80M | — | $223.09M | 1.2% | n/c | 1 | SEC ↗ |
| 31 | Two Sigma Investments ✦ | 1.48M | — | $183.61M | 0.4% | n/c | 1 | SEC ↗ |
| 32 | Soros Fund Management ✦ | 300.00K | — | $37.14M | 1.1% | n/c | 1 | SEC ↗ |
| 33 | Fairfax Financial ✦ | 172.90K | — | $21.39M | 1.8% | n/c | 1 | SEC ↗ |
| 34 | Dodge & Cox ✦ | 158.88K | — | $19.67M | 0.0% | n/c | 1 | SEC ↗ |
| 35 | Gotham Asset Management ✦ | 137.65K | — | $17.04M | 0.2% | n/c | 1 | SEC ↗ |
| 36 | GAMCO Investors ✦ | 76.77K | — | $9.50M | 0.1% | n/c | 1 | SEC ↗ |
| 37 | PRIMECAP Management ✦ | 72.80K | — | $9.01M | 0.0% | n/c | 1 | SEC ↗ |
| 38 | Renaissance Technologies ✦ | 4.92K | — | $609,688 | 0.0% | n/c | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| No new tracked buyers this quarter. |
Exited
| No tracked exits this quarter. |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 3,742 holders, 1.88B shares, $215.80B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Officer · 10.00K sh · $1.35M
Officer · 80.31K sh · $10.72M
Officer · 11.10K sh · $1.46M
Officer · 600 sh · $79,222
Officer · 5.43K sh · $718,261
Officer · 7.41K sh · $973,165
Officer · 20.78K sh · $2.71M
Officer · 805 sh · $105,472
Officer · 4.95K sh · $643,993
Officer · 300 sh · $39,307
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology