Key Highlights

● Nvidia announced a $150 billion buyback authorization on Monday, September 28, 2026, described as the largest in U.S. history.

● The stock finished little changed on Tuesday, with sources differing on direction, after closing at $228.86 on Monday.

● Nvidia introduced an Open Agent Safety Platform aimed at securing AI agents, as safety became a live industry issue.

● Long-term Treasury yields hit multi-decade highs, weighing on richly valued growth stocks even as chip stocks gained.

Nvidia's $150 billion buyback authorization, announced on Monday, September 28, 2026, dominated trading-floor chatter again on Tuesday. It was described as the largest in U.S. history, and its sheer size kept the chip giant at the center of the AI conversation even as the stock barely budged. Nvidia (NASDAQ:NVDA) finished little changed on Tuesday, with sources differing on direction. One showed the shares at $230.30 at midday, while another reported a small decline at the close. The stock had closed at $228.86 on Monday.

Why a Buyback This Big Matters

A share buyback lets a company use cash to repurchase its own stock, reducing the number of shares outstanding. That can lift earnings per share and signals that management believes the stock is a good use of capital. The move underlines how much cash the AI boom has thrown off for Nvidia, whose processors sit at the center of the AI build-out. It also comes as rivals push harder: AMD (NASDAQ:AMD) agreed on Tuesday to buy Fei-Fei Li's World Labs for $8.2 billion in stock, a sign that the chip race is widening into models and software.

Ratings and New Products

Rosenblatt reiterated its Buy rating on Nvidia with a $390 price target. Nvidia also drew attention for its Open Agent Safety Platform, a new offering aimed at securing AI agents. Nvidia's vice president of enterprise AI said traditional model-level protections are no longer sufficient to manage the capabilities of AI agents. Safety is a live issue across the industry: a report said OpenAI delayed a model release over security concerns, and a leaked Anthropic IPO prospectus warned of existential risk to humanity even as it pointed to a valuation target above $2 trillion.

Chips Up, Market Down

Semiconductors were among Tuesday's stronger groups. The SMH chip ETF gained, and Broadcom rose to $355.10. Applied Materials, Arm and Marvell climbed. The Nasdaq-100 edged higher to 30,339.33 on the chip rally, even as the S&P 500 slipped 12.85 points to 7,670.84 and the Dow Jones Industrial Average fell 131.59 points to 51,349.92. The Nasdaq Composite ended nearly flat at 26,797.54. It was the fifth loss in six sessions for the three major indexes.

The Bond Market Is the Headwind

The 30-year Treasury yield reached its highest level since 2002, and the 10-year touched its highest in roughly two decades. Higher yields make future profits worth less in today's money, which tends to weigh on richly valued growth stocks, including chipmakers. One market commentator said a bounce in the mega-caps after a weak day has been the recent pattern, but it will not change the bigger issue.

Dates That Matter for Nvidia Investors

Micron reports fiscal fourth-quarter results on Wednesday, September 30, a key read on AI memory demand tied closely to Nvidia's products. The same day brings August PCE inflation and the third estimate of GDP, plus quarter-end positioning. The September jobs report follows Friday, October 2, with about 95,000 jobs expected, and the Fed meets again October 27 to 28.