Johannes Jacobus Oosthuizen is President at Merck & Co., Inc. (MRK). They have made 7 open-market trades across 1 company since 2022, most recently 2026-04-29.
CIK 0001916310
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 7 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| MRK | 21,895 | $3.3M |
Shares reported on the most recent Form 4, priced at the 2026-05-01 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MRK | SELL | 2026-02-06 | 2026-02-06 | $121.87 | $1.8M | +0.4% | -3.5% | -7.5% |
| MRK | SELL | 2025-02-19 | 2025-02-20 | $84.09 | $715K | +5.2% | +4.9% | -12.5% |
| MRK | SELL | 2024-02-02 | 2024-02-05 | $127.18 | $4.8M | -0.1% | -2.3% | +0.8% |
| MRK | SELL | 2023-11-09 | 2023-11-13 | $102.38 | $426K | -0.8% | +4.3% | +22.1% |
| MRK | SELL | 2022-11-09 | 2022-11-10 | $103.21 | $371K | +6.3% | +8.4% | +6.1% |
| MRK | SELL | 2022-11-07 | 2022-11-07 | $99.47 | $9.1M | +2.2% | +10.0% | +4.0% |
| MRK | SELL | 2022-10-28 | 2022-11-01 | $100.21 | $728K | -1.7% | +10.2% | +6.5% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.