NVIDIA's share price action during the week of September 28, 2026, reflected robust AI-driven demand and a major corporate catalyst, with the stock closing at $228.86 on September 28 before settling near $228–$231 amid elevated trading volumes exceeding 100 million shares daily. The primary driver was the September 28 announcement of a $150 billion increase to the share repurchase authorization, lifting the remaining program to $235 billion and signaling strong management confidence in sustained growth. This followed fiscal Q2 results showing 106% year-over-year revenue growth to $96.2 billion, led by data center sales, alongside optimistic guidance for roughly 70% revenue expansion in fiscal 2028 and ongoing Blackwell platform momentum. Broader sector tailwinds from hyperscale AI investments and recent partnerships further supported trader sentiment, though margin pressures from memory costs and valuation multiples near 29 times forward earnings introduced some caution around near-term resolution thresholds.