Oosthuizen Johannes Jacobus (CIK 1916310) reported 4 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-05-01). Recent activity: Buy MRK (1,377 shares), Sell MRK (679 shares), Sell MRK (15,000 shares), Buy MRK (5,026 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-05-01 | Merck & Co., Inc. (MRK) | EVP, Oncology & Int?l | Buy | 1,377 | $151,511 |
| 2026-05-01 | Merck & Co., Inc. (MRK) | EVP, Oncology & Int?l | Sell | 679 | $74,710 |
| 2026-02-06 | Merck & Co., Inc. (MRK) | President, U.S. Market | Sell | 15,000 | $1.8M |
| 2026-01-28 | Merck & Co., Inc. (MRK) | President, U.S. Market | Buy | 5,026 | $539,792 |
Source: SEC Form 4 filings · as of 2026-05-01