Oosthuizen Johannes Jacobus

Officer · MRK

As of 2026-09-16, Oosthuizen Johannes Jacobus has 14 Form 4 transactions on record across 1 company — 7 in the trailing 12 months.

Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.

Pattern in the record: open-market sales filed in February in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.

Reconstructed holdings

Direct: $4.5MIndirect: $0$4.5Mas of 2026-09-16
  • Direct $4.5M
  • Indirect $0
MRKdirect31,044 sh$4.5M

Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.

Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.

Trades by company

MRK · 14 trades
2026-05-05: Award / grant, 31,044 sh ($0)2026-05-05: Award / grant, 10,605 sh ($0)2026-04-29: Option exercise, 1,377 sh ($152K)2026-04-29: Withheld for tax, 679 sh ($75K)2026-04-29: Option exercise, 1,377 sh ($0)2026-02-06: Sale, 15,000 sh ($1.8M)2026-01-26: Award / grant, 5,026 sh ($540K)2025-04-29: Award / grant, 4,132 sh ($0)2025-04-29: Award / grant, 18,807 sh ($0)2025-02-19: Sale, 8,500 sh ($715K)2025-02-08: Option exercise, 13,002 sh ($1.1M)2025-02-08: Withheld for tax, 6,404 sh ($559K)2025-02-08: Option exercise, 13,002 sh ($0)2025-01-27: Award / grant, 8,664 sh ($849K)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-02-06MRKSale15,000 @ $121.87$1.8M−41.4% of holding21,197Form 4
2025-02-19MRKSale8,500 @ $84.09$715K−21.7% of holding30,705Form 4
12 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-05-05MRKAward / grant31,04431,044Form 4
2026-05-05MRKAward / grant10,60510,605Form 4
2026-04-29MRKOption exercise1,37722,574Form 4
2026-04-29MRKWithheld for tax67921,895Form 4
2026-04-29MRKOption exercise1,3772,755Form 4
2026-01-26MRKAward / grant5,02636,197Form 4
2025-04-29MRKAward / grant4,1324,132Form 4
2025-04-29MRKAward / grant18,80718,807Form 4
2025-02-08MRKOption exercise13,00245,609Form 4
2025-02-08MRKWithheld for tax6,40439,205Form 4
2025-02-08MRKOption exercise13,0020Form 4
2025-01-27MRKAward / grant8,66432,607Form 4

Source: SEC Form 4 filings. Each row links to its original filing.

Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.