Merck & Co., Inc. (MRK) Insider Trading
Over the last 3 months, MRK insiders made 0 open-market buys and 13 sales, a net sale of -$25.6M (SEC Form 4). Over the last 6 months, 3075 institutions increased and 3131 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
13
Net (3m)
-$25.6M
Insider trades by month Buys Sells
Feb
Apr
Nov
Feb
Aug
Context3-month price +28.4%Institutions mixed (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Aug 13, 2026 | Zachary Jenniferofficer: EVP, General Counsel | Option | 41,494 | $117.89 |
| Aug 13, 2026 | Zachary Jenniferofficer: EVP, General Counsel | Option | 13,433 | $84.71 |
| Aug 13, 2026 | Guindo Chirfiofficer: EVP, Access, Policy & Comms | Sell | 10,000 | $135.00 |
| Aug 13, 2026 | Zachary Jenniferofficer: EVP, General Counsel | Sell | 80,315 | $133.46 |
| Aug 12, 2026 | DeLuca Richard R.officer: EVP&Pres, Merck Animal Heallth | Sell | 5,427 | $132.35 |
| Aug 12, 2026 | DeLuca Richard R.officer: EVP&Pres, Merck Animal Heallth | Sell | 600 | $132.04 |
| Aug 12, 2026 | DeLuca Richard R.officer: EVP&Pres, Merck Animal Heallth | Sell | 7,410 | $131.33 |
| Aug 12, 2026 | DeLuca Richard R.officer: EVP&Pres, Merck Animal Heallth | Sell | 11,099 | $131.61 |
| Aug 12, 2026 | DeLuca Richard R.officer: EVP&Pres, Merck Animal Heallth | Sell | 20,784 | $130.43 |
| Aug 10, 2026 | DeLuca Richard R.officer: EVP&Pres, Merck Animal Heallth | Sell | 4,945 | $130.23 |
| Aug 10, 2026 | DeLuca Richard R.officer: EVP&Pres, Merck Animal Heallth | Sell | 300 | $131.02 |
| Aug 10, 2026 | DeLuca Richard R.officer: EVP&Pres, Merck Animal Heallth | Sell | 805 | $131.02 |
| Aug 7, 2026 | Maraldo David R.officer: EVP & Pres. MMD | Sell | 2,686 | $128.72 |
| Aug 7, 2026 | Maraldo David R.officer: EVP & Pres. MMD | Option | 2,686 | $84.71 |
| Aug 7, 2026 | Williams David Michaelofficer: EVP,Chief Info&Digital Officer | Option | 34,705 | $73.73 |
| Aug 7, 2026 | Maraldo David R.officer: EVP & Pres. MMD | Option | 6,311 | $73.73 |
| Aug 7, 2026 | Williams David Michaelofficer: EVP,Chief Info&Digital Officer | Option | 4,600 | $77.62 |
| Aug 7, 2026 | Guindo Chirfiofficer: EVP, Access, Policy & Comms | Sell | 15,000 | $131.00 |
| Aug 7, 2026 | Maraldo David R.officer: EVP & Pres. MMD | Option | 9,709 | $87.10 |
| Aug 7, 2026 | Williams David Michaelofficer: EVP,Chief Info&Digital Officer | Option | 13,542 | $75.36 |
| Aug 7, 2026 | Williams David Michaelofficer: EVP,Chief Info&Digital Officer | Sell | 34,705 | $128.77 |
| Jul 1, 2026 | Seidman Christine Edirector | Grant | 63 | — |
| Jul 1, 2026 | Coe Mary Ellendirector | Grant | 233 | — |
| Jul 1, 2026 | Karsanbhai Surendralal Lancadirector | Grant | 126 | — |
| Jun 2, 2026 | Seidman Christine Edirector | Grant | 1,853 | — |
| Jun 2, 2026 | LAVIZZO-MOUREY RISA Jdirector | Grant | 1,853 | — |
| Jun 2, 2026 | THULIN INGE Gdirector | Grant | 1,853 | — |
| Jun 2, 2026 | Warden Kathy Jdirector | Grant | 1,853 | — |
| Jun 2, 2026 | GLOCER THOMAS Hdirector | Grant | 1,853 | — |
| Jun 2, 2026 | Coe Mary Ellendirector | Grant | 1,853 | — |
Source: MRK SEC Form 4 filings, latest Aug 13, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their MRK positions over the last 6 months (SEC Form 13F).
Increased
3075
New positions
561
Reduced
3131
Sold out
130
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| BlackRock, Inc. | Increased | 227.0M | Aug 7, 2026 |
| BLACKROCK, INC. | Increased | 225.9M | May 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 161.3M | Aug 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 161.0M | May 15, 2026 |
| STATE STREET CORP | Increased | 120.4M | Aug 7, 2026 |
| STATE STREET CORP | Reduced | 119.3M | May 15, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | Increased | 86.2M | Aug 14, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | Reduced | 84.3M | May 15, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 67.7M | Aug 13, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 67.3M | May 8, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 60.7M | Aug 12, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Reduced | 59.6M | May 15, 2026 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | Increased | 54.4M | Aug 14, 2026 |
| JPMORGAN CHASE & CO | Increased | 53.0M | May 13, 2026 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | Increased | 49.8M | May 15, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.