Mark Stevens sold $646m of NVIDIA in four days — and then published his next $1.09bn

31 Aug – 3 Sep 2026. Why it is unusual: his own disclosed cadence for the prior three months was two sales totalling $296m. He did more than twice that in four days, with no 10b5-1 plan on the Form 4 — and then filed a Form 144 announcing an intent to sell 5,000,000 more. The anomaly is not the size. It is that he told everyone what he would do next.