Rietbroek Robbert

Director · Officer · GPK, PRMB

As of 2026-09-16, Rietbroek Robbert has 6 Form 4 transactions on record across 2 companies — 3 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.

Reconstructed holdings

Direct: $12.8MIndirect: $0$12.8Mas of 2026-09-16
  • Direct $12.8M
  • Indirect $0
PRMBdirect586,349 sh$12.4M
GPKdirect44,278 sh$428K

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

GPK · 3 trades
2026-03-04: Purchase, 44,278 sh ($501K)2026-02-25: Award / grant, 165,030 sh ($0)2026-01-01: Award / grant, 265,605 sh ($0)
PRMB · 3 trades
2025-08-13: Purchase, 8,285 sh ($200K)2025-01-01: Withheld for tax, 50,068 sh ($1.5M)2024-12-11: Award / grant, 81,453 sh ($0)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-03-04GPKPurchase44,278 @ $11.32$501Kownership Δ n/a44,278Form 4
2025-08-13PRMBPurchase8,285 @ $24.12$200K+1.4% of holding586,349Form 4
4 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-02-25GPKAward / grant165,030165,030Form 4
2026-01-01GPKAward / grant265,605265,605Form 4
2025-01-01PRMBWithheld for tax50,068331,717Form 4
2024-12-11PRMBAward / grant81,453381,785Form 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.