NVIDIA shares closed at $228.86 on September 28 after rising 1.68% on the company's announcement of an additional $150 billion share repurchase authorization, bringing the total program to $235 billion through fiscal 2028—the largest such increase on record. The move, tied to robust cash generation from AI-driven data center demand, lifted the stock from its prior close near $225 and contributed to intraday highs above $233. With September 30 marking the final trading session of the month and quarter, trader focus centers on whether momentum from the buyback and broader semiconductor strength can sustain levels near recent highs around $236. Next key catalyst is the November 18 earnings release, while supply constraints and memory cost pressures remain noted risks to margins.