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Of the 18 tracked institutions holding MRK, 12 have a 3-year clone track record — 9 of them beat the S&P. Average holder's clone alpha: +3.2pt. It's a gauge of who owns the name, not just how many.
Among the 18 tracked institutional investors we monitor, MRK (MERCK & CO INC) is held with a combined value of $100.18B across 824,886,842 shares. The largest holder is BlackRock, Inc. with a position worth $29.17B (0.43% of their portfolio). Bridgewater Associates, LP opened a new position in the most recent quarter. 7 funds increased their holdings. 9 funds reduced their position.
Total Institutional Value
$100.18B
Total Shares Held
824,886,842
Institutional Holders
18
% of Shares Outstanding
33.4%
of 2.47B shares · SEC 2026-07-31
Days to Cover
2.8-13.3%
24.51M shares short · FINRA 2026-08-14
Tracked 13F institutions hold 33.4% of MRK's shares outstanding. This is a floor: 13F filings arrive on a ~45-day lag and we track only a subset of institutional filers, so true institutional ownership is higher. Shares-outstanding is the latest SEC cover-page figure (as of 2026-07-31), not a live float.
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
0
$0
17
$29.98M
Total Transactions
17
Last 12 months
| Date | Insider | Code | Type | Shares | Value |
|---|---|---|---|---|---|
| Aug 13, 2026 | Chirfi Guindo | S | Sale | 10,000 | $1.35M |
| Aug 12, 2026 | Richard R. DeLuca | S | Sale | 11,099 | $1.46M |
| Aug 12, 2026 | Jennifer Zachary | S | Sale | 80,315 | $10.72M |
| Aug 12, 2026 | Richard R. DeLuca | S | Sale | 600 | $79.22K |
| Aug 11, 2026 | Richard R. DeLuca | S | Sale | 7,410 | $973.16K |
| Aug 11, 2026 | Richard R. DeLuca | S | Sale | 5,427 | $718.26K |
| Aug 10, 2026 | Richard R. DeLuca | S | Sale | 20,784 | $2.71M |
| Aug 6, 2026 | Richard R. DeLuca | S | Sale | 805 | $105.47K |
| Aug 6, 2026 | Chirfi Guindo | S | Sale | 15,000 | $1.97M |
| Aug 6, 2026 | Richard R. DeLuca | S | Sale | 300 | $39.31K |
Showing 10 of 17 transactions
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | BlackRock, Inc. | $29.17B | 0.43% | +0.5% |
| 2 | VANGUARD GROUP INC | $26.77B | 0.39% | +0.9% |
| 3 | STATE STREET CORP | $15.57B | 0.46% | +0.9% |
| 4 | WELLINGTON MANAGEMENT GROUP LLP | $11.08B | 1.91% | +2.3% |
| 5 | FMR LLC | $5.84B | 0.25% | +2.1% |
| 6 | Fisher Asset Management, LLC | $4.95B | 1.47% | +45.7% |
| 7 | PRICE T ROWE ASSOCIATES INC /MD/ | $2.38B | 0.24% | -19.6% |
| 8 | HARRIS ASSOCIATES L P | $1.55B | 2.06% | -2.4% |
| 9 | AQR CAPITAL MANAGEMENT LLC | $1.04B | 0.36% | -5.7% |
| 10 | Grantham, Mayo, Van Otterloo & Co. LLC | $871.87M | 1.96% | -3.3% |
| Member | Type | Date |
|---|---|---|
| Alan Armstrong | Sell | Mar 27, 2026 |
| Josh Gottheimer | Buy | Feb 4, 2026 |
| Gilbert Cisneros | Buy | Dec 19, 2025 |
| Julie Johnson | Sell |
As of the latest SEC 13F filings, BlackRock, Inc. is the largest institutional holder of MRK with a position worth $29.17B, representing 0.43% of their portfolio. In total, 18 institutional investors hold MRK with a combined value of $100.18B.
In the most recent quarter, 1 fund opened a new position in MRK. Additionally, 7 increased their holdings and 9 reduced their positions.
Institutional investors hold $100.18B worth of MRK stock across 18 positions. The largest institutional holder is BlackRock, Inc. with $29.17B in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For MRK, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their MRK positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
| Dec 18, 2025 |
| Gilbert Cisneros | Buy | Nov 18, 2025 |
| Julie Johnson | Sell | Nov 13, 2025 |
| Valerie Hoyle | Sell | Sep 23, 2025 |
| Marjorie Taylor Greene | Buy | Aug 28, 2025 |
Showing 8 of 92. STOCK Act disclosures lag up to 45 days.
Last Close
$147.53
2026-09-09
YTD
+38.6%
89% of 52-week range
