Insider · SEC Form 4 filer

Robbert Rietbroek

Companies

Where they file as an insider

Graphic Packaging Holding (GPK) President and CEO, Director Latest filing Mar 4, 2026
Primo Brands (PRMB) CEO, Director Latest filing Aug 13, 2025
Primo Water (PRMW) CEO, Director Latest filing Nov 8, 2024

Track record

Did their buys beat the typical stock?

Open-market buys2
Quarters checked 6 months later2
Beat the typical stock —
Quarters too new to check0

Too soon to tell. 2 quarters have finished so far. We show a record once 3 have.

Graphic Packaging Holding (GPK) Bought Mar 4, 2026 · $501K · 44,278 shares Behind typical Mar 31, 2026 $9.94 → Sep 30, 2026 $9.05 · −9.0% (typical stock +1.7%)
Primo Brands (PRMB) Bought Aug 13, 2025 · $200K · 8,285 shares Behind typical Sep 30, 2025 $22.10 → Mar 31, 2026 $18.83 · −14.8% (typical stock −3.4%)

Each row is one stock in one quarter, however many buys it took. We take the stock's price at the end of that quarter and again 6 months later, and compare it with the typical stock over the same dates. Prices are quarter-end values from funds' 13F reports (the middle value across 3 or more funds), through Sep 30, 2026. Moves past 3 times up or down, mostly stock splits, are left out. How we tested this.

Past results. This is data, not advice.

Where this data comes from. Insider trades, fund holdings, activist stakes and company results come from public SEC EDGAR filings (Forms 4, 13F, 13D/13G, 10-Q and 8-K). Congress trades come from the STOCK Act reports members file with the House Clerk and the Senate. Daily closing prices come from post-no-preference/stocks on DoltHub, a community-run database shared under CC BY-SA 4.0; the prices we show stay under that license. They are each day's close, not live or official exchange prices.

This is data, not investment advice. About StockToast · Your watchlist