Merck & Co., Inc. (MRK) ownership: Top institutional holder: BlackRock, Inc. ($27.18B). Insider activity: Net Seller (0 buys, 20 sells). 10 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 225926330.00 | $27.18B | 2026-03-31 |
| VANGUARD GROUP INC | 254322763.00 | $26.77B | 2025-12-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 160987624.00 | $19.37B | 2026-03-31 |
| STATE STREET CORP | 119325673.00 | $14.45B | 2026-03-31 |
| WELLINGTON MANAGEMENT GROUP LLP | 84314971.00 | $10.14B | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 67304305.00 | $8.10B | 2026-03-31 |
| GEODE CAPITAL MANAGEMENT, LLC | 59558154.00 | $7.14B | 2026-03-31 |
| JPMORGAN CHASE & CO | 52972983.00 | $6.26B | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-05-05 | |
| Sell | null | 2026-05-05 | |
| Sell | null | 2026-05-05 | |
| Sell | null | 2026-05-05 | |
| Sell | null | 2026-05-05 | |
| Sell | null | 2026-05-05 | |
| Sell | null | 2026-05-05 | |
| Sell | null | 2026-05-05 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.