COO Buys, Activist Dumps: Fresh Filings Stand Out

Insider filings reported this week reveal a sharp split between opportunistic buying and large-scale exits.

UBER President and COO Andrew MacDonald filed this week disclosing open-market purchases totalling roughly $5.3M across two tranches on September 4. He bought 54,325 shares plus an additional 15,675 shares at market prices. C-suite purchases of this size — using real cash, not options — carry weight. Uber has drawn growing social media attention in recent weeks around its autonomous vehicle strategy.

At ILMN, activist fund Corvex Management filed disclosing sales of over $34M in Illumina stock across two trades on September 2 and 4. Corvex holds a board seat, making these exits notable. The sales suggest the activist may be trimming a position after years of pressure on the genomics company.

NMIH CEO Adam Pollitzer reported selling $7.7M of NMI Holdings shares on September 4. The filing was entered the same day, suggesting a discretionary rather than pre-planned move — though that detail warrants watching.

Two directors at HELP (Cybin) filed purchases totalling roughly $2.4M combined. The psychedelics biotech has been active on social media. Director-level buying at this scale in a small-cap name is a stronger signal than routine executive grants.

Meanwhile, WBD Director Kenneth Lowe disclosed selling $5.7M of Warner Bros. Discovery shares on September 3.

This is not financial advice.