MRK
Merck & Co., Inc. · Healthcare · Drug Manufacturers - General
Momentum inputs (comparable managers): holder breadth 0.0% · share flow -0.9% · net new positions -3.7% — formula
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 183 | 0 | 1.60B | $205.64B | +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 | The Vanguard Group ✦ (passive) | 252.14M | -0.3% | $21.16B | 0.3% | ▼ Trim | 2 | SEC ↗ ×6 |
| 2 | BlackRock ✦ (passive) | 214.88M | -1.6% | $18.03B | 0.3% | ▼ Trim | 2 | SEC ↗ ×21 |
| 3 | State Street Global Advisors ✦ (passive) | 118.18M | -0.3% | $10.01B | 0.3% | ▼ Trim | 4 | SEC ↗ |
| 4 | Wellington Management ✦ | 75.28M | -2.0% | $6.32B | 1.1% | ▼ Trim | 6 | SEC ↗ ×9 |
| 5 | JPMorgan Chase ✦ | 70.40M | — | $5.91B | 0.2% | n/c | 1 | SEC ↗ ×46 |
| 6 | Geode Capital Management ✦ (passive) | 59.80M | +1.4% | $5.01B | 0.3% | ▲ Add | 6 | SEC ↗ ×2 |
| 7 | Morgan Stanley ✦ | 44.59M | — | $3.74B | 0.2% | n/c | 1 | SEC ↗ ×19 |
| 8 | Fidelity (FMR) ✦ | 33.43M | +5.9% | $2.81B | 0.1% | ▲ Add | 2 | SEC ↗ ×6 |
| 9 | Fisher Asset Management ✦ | 24.07M | -3.8% | $2.02B | 0.7% | ▼ Trim | 6 | SEC ↗ |
| 10 | Arrowstreet Capital ✦ | 18.71M | -3.8% | $1.57B | 1.0% | ▼ Trim | 6 | SEC ↗ |
| 11 | Goldman Sachs Group ✦ | 15.02M | — | $1.26B | 0.2% | n/c | 1 | SEC ↗ ×6 |
| 12 | T. Rowe Price ✦ | 13.60M | +26.0% | $1.14B | 0.1% | ▲ Add | 6 | SEC ↗ ×2 |
| 13 | AQR Capital Management ✦ | 10.66M | +21.3% | $851.37M | 0.5% | ▲ Add | 6 | SEC ↗ ×8 |
| 14 | Harris Associates (Oakmark) ✦ | 9.82M | +7.6% | $824.50M | 1.3% | ▲ Add | 5 | SEC ↗ ×2 |
| 15 | D. E. Shaw & Co. ✦ | 3.47M | -66.5% | $291.06M | 0.2% | ▼ Trim | 6 | SEC ↗ ×2 |
| 16 | Two Sigma Investments ✦ | 1.97M | -19.2% | $165.27M | 0.3% | ▼ Trim | 6 | SEC ↗ |
| 17 | Point72 Asset Management ✦ | 1.26M | +21671.6% | $105.98M | 0.2% | ▲ Add | 2 | SEC ↗ |
| 18 | Adage Capital Partners ✦ | 1.05M | -26.1% | $88.43M | 0.1% | ▼ Trim | 6 | SEC ↗ |
| 19 | Citadel Advisors ✦ | 968.05K | New | $81.25M | 0.1% | New | 1 | SEC ↗ ×2 |
| 20 | Marshall Wace ✦ | 883.90K | -71.9% | $74.19M | 0.1% | ▼ Trim | 6 | SEC ↗ |
| 21 | Millennium Management ✦ | 763.37K | -22.9% | $64.07M | 0.1% | ▼ Trim | 6 | SEC ↗ |
| 22 | Gotham Asset Management ✦ | 592.31K | +23.6% | $49.71M | 0.2% | ▲ Add | 6 | SEC ↗ |
| 23 | Bridgewater Associates ✦ | 513.94K | -55.3% | $43.14M | 0.2% | ▼ Trim | 6 | SEC ↗ |
| 24 | Fairfax Financial ✦ | 172.90K | 0.0% | $14.51M | 0.7% | Held | 6 | SEC ↗ |
| 25 | Dodge & Cox ✦ | 154.28K | -1.9% | $12.95M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 26 | GAMCO Investors ✦ | 63.06K | -8.9% | $5.29M | 0.1% | ▼ Trim | 6 | SEC ↗ |
| 27 | PRIMECAP Management ✦ | 46.00K | -11.4% | $3.86M | 0.0% | ▼ Trim | 6 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Citadel Advisors | $81.25M | 0.1% |
Exited
| Norges Bank | $2.86B | was 0.4% |
| Renaissance Technologies | $11.07M | was 0.0% |
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