Founder Dumps $21M as CEO Buys Across Markets

Insider activity picked up sharply this week. The biggest single trade came from ARGX. argenx founder and CEO Timothy Van Hauwermeiren filed a $21.1 million sale on September 5. He sold 20,000 shares at roughly $1,056 each on September 3. argenx carries a $64.9 billion market cap. The trade was discretionary — no 10b5-1 plan was flagged — which makes it a stronger signal than a pre-scheduled disposal.

On the buy side, CPU — Computershare's CEO Stuart Irving — received a share award of over 184,000 shares on September 1. The award is compensation, not an open-market purchase, and carries a low significance rating. Still, the filing landed today.

A cluster of sales emerged at INDO-MIM Limited. Three designated persons sold a combined $5.1 million in shares between September 1 and 3. All filings hit today.

PBF billionaire 10% shareholder Carlos Slim Helú filed a $4.2 million sale of 54,484 shares on September 4. PBF Energy is a US oil refiner. That filing was reported on September 4.

On the activist front, Invesco Asset Management disclosed a $3 million buy in China Oilfield Services, crossing key ownership thresholds — though stake sizes are as last disclosed and may have shifted since filing.