 Insiders Bought $1.4 Billion in One Day: Analysis of Key Signals May 4th was one of the most active days for insider buying. What caught the attention of major players? - Volkswagen AG bought 62.9 million shares of Rivian ($RIVN) for $1 billion — this is not just a purchase, it's consolidation of control. VW entered at $15.90, increasing its stake by 43%. Signal: the German auto giant is betting on American electric transportation. - Sumitomo Mitsui Financial Group bought 6.4 million shares of Jefferies ($JEF) for $310 million — a new position. The Japanese bank enters the American investment bank, buying at $48.22. - Bill Ackman bought 800,000 shares of Pershing Square ($PS) for $19 million — the CEO increases his stake in his own fund. Confidence in his own product. - Arch Venture Partners bought 1.1 million shares of Seaport Therapeutics ($SPTX) for $19.8 million — venture capital in biotech continues to buy. - CEO of S&P Global ($SPGI) Katherine Clay bought 2,500 shares at $431.39 — a new position by the company's head. The first purchase is always a signal. - Option Care Health ($OPCH) — CEO and CFO bought shares on the same day. Totaling $592,000. Trend: corporate and institutional investors are actively increasing positions. The biggest money is in Rivian and Jefferies. Biotech and healthcare are also in focus. Data: OpenInsider, May 4, 2026.