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Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in MRK held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 225.9M | $27.18B | +3.1% | 9.147% | 0.48% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 161.0M | $19.37B | — | 6.518% | 0.48% |
| 3 | STATE STREET CORP | 119.3M | $14.45B | -0.6% | 4.831% | 0.50% |
| 4 | WELLINGTON MANAGEMENT GROUP LLP | 84.3M | $10.14B | -2.5% | 3.414% | 1.89% |
| 5 | VANGUARD PORTFOLIO MANAGEMENT LLC | 67.3M | $8.10B | — | 2.725% | 0.43% |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | 59.6M | $7.14B | -0.8% | 2.411% | 0.44% |
| 7 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 49.8M | $5.99B | +2.5% | 2.015% | 0.91% |
| 8 | MORGAN STANLEY | 47.6M | $5.73B | +6.0% | 1.929% | 0.35% |
| 9 | FMR LLC | 44.5M | $5.35B | +9.0% | 1.802% | 0.29% |
| 10 | BANK OF AMERICA CORP /DE/ | 30.8M | $3.70B | +10.5% | 1.246% | 0.27% |
| 11 | NORTHERN TRUST CORP | 27.1M | $3.26B | -0.5% | 1.097% | 0.43% |
| 12 | Fisher Asset Management, LLC | 26.4M | $3.18B | +6.3% | 1.070% | 1.08% |
| 13 | Kentucky Farm Bureau Mutual Insurance Co | 32K | $2.88B | — | 0.001% | 0.07% |
| 14 | Invesco Ltd. | 21.9M | $2.63B | +6.4% | 0.885% | 0.40% |
| 15 | GOLDMAN SACHS GROUP INC | 21.8M | $2.63B | +5.6% | 0.884% | 0.30% |
| 16 | UBS ASSET MANAGEMENT AMERICAS INC | 20.4M | $2.46B | +5.1% | 0.827% | 0.51% |
| 17 | Legal & General Group Plc | 19.5M | $2.35B | -1.2% | 0.791% | 0.54% |
| 18 | Bank of New York Mellon Corp | 18.7M | $2.25B | -2.4% | 0.758% | 0.41% |
| 19 | AMERIPRISE FINANCIAL INC | 16.3M | $1.96B | +1.8% | 0.658% | 0.45% |
| 20 | FRANKLIN RESOURCES INC | 16.3M | $1.96B | +1.3% | 0.659% | 0.48% |
| 21 | DIMENSIONAL FUND ADVISORS LP | 15.5M | $1.86B | +23.8% | 0.626% | 0.39% |
| 22 | UBS Group AG | 14.7M | $1.76B | -27.1% | 0.594% | 0.26% |
| 23 | VANGUARD FIDUCIARY TRUST CO | 14.0M | $1.68B | — | 0.565% | 0.43% |
| 24 | STATE FARM MUTUAL AUTOMOBILE INSURANCE CO | 13.8M | $1.66B | 0.0% | 0.558% | 1.31% |
| 25 | Amundi | 13.8M | $1.66B | +2.8% | 0.557% | 0.45% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in MRK — a direct measure of their conviction.
Filings activity in MRK during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new MRK position in Q1 2026
Institutions that fully closed their MRK position in Q1 2026
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 3,665 | +5.0% | 75.28% | +7.64 pp | $221.35B | +11% |
| Q4 2025 | 3,489 | +10.0% | 67.64% | +15.42 pp | $198.88B | +30% |
| Q3 2025 | 3,172 | 0.9% | 52.22% | +1.09 pp | $153.55B | +2.1% |
| Q2 2025 | 3,200 | 2.8% | 51.13% | 6.62 pp | $150.33B | 11% |
| Q1 2025 | 3,292 | 3.2% | 57.75% | 6.16 pp | $169.80B | 9.6% |
| Q4 2024 | 3,401 | +2.5% | 63.91% | 5.82 pp | $187.92B | 8.4% |
| Q3 2024 | 3,318 | 1.5% | 69.73% | 19.28 pp | $205.04B | 22% |
| Q2 2024 | 3,367 | — | 89.01% | — | $261.72B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying MRK stock.
Based on Q1 2026 13F filings, institutional ownership of Merck & Co., Inc. stands at 75.3%, held across 3,665 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of MRK, with approximately 225,926,330 shares worth $27.18B as of Q1 2026.
Yes — 1 widely-followed marquee investor appear among the top 25 institutional holders of MRK, including Fisher Asset Management, LLC.
Our composite Smart Money Score for MRK is 71 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
394 institutions opened new positions in MRK during Q1 2026, while 218 fully exited. 2,805 added to existing positions and 452 trimmed.
MRK institutional ownership rose by 7.64 percentage points quarter-over-quarter, with a net change of +176 holders.
The top 10 institutions account for 48.4% of all reported 13F value in MRK, and the top 25 account for 63.8%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Merck & Co., Inc. (MRK) Institutional Ownership