Nvidia announces historic $150 billion share buyback, tool to stop AI agents going rogueNvidia has announced the biggest share buyback in history, bringing its stock repurchase program to $US235 billion.Tamika Seeto2 min readSeptember 29, 2026 - 8:40AMNvidia has announced a historic $US150 billion share buyback, making it the largest in corporate history. The increase comes just four months after the chipmaker giant announced a $US80 billion share buyback, bringing the company’s overall buyback program to a massive $US235 billion. Want more finance news? Download our new app for even more coverage“Nvidia’s growth is being driven by a once-in-a-generation platform shift to AI and accelerated computing,” Nvidia CEO and founder Jensen Huang said.“Our cash generation gives us the capacity to invest in the technologies that advance this transformation and return capital to shareholders. This authorisation reflects our confidence in the long-term opportunity ahead.” Nvidia announced a $US150 billion stock buyback on Monday. Picture: I-HWA CHENG / AFPCompanies use buybacks to return cash to investors and support the stock’s price. Earnings per share can also increase because there are fewer outstanding shares. They also signal confidence in their own stock.Others you may likenewsnewsThe move eclipses Apple, which held the previous record with its $US110 billion buyback in 2024. Nvidia’s shares rose 1.7 per cent following the announcement.The move limited US market declines, with the Dow Jones index finishing down about 0.7 per cent, the S&P 500 down 0.8 per cent and the NASDAQ down 0.9 per cent on Monday.US share markets fell after Donald Trump rejected an Iranian proposal to end the conflict, leading to a spike in crude oil prices.Nvidia reported quarterly profits of $US59.69 billion in late August. That was more than double the $US26.42 billion reported in the same quarter last year.Revenue also more than doubled to $US96.2 billion. The company’s chips have become the centrepiece of giant AI data centres.It is now the most valuable public company in the world, with a market cap of about $US5.6 trillion.New platform to rein in rogue AI agentsNvidia on Monday also unveiled a new security platform that it said could stop AI agents from going rogue.It announced its Open Agent Safety Platform, an open source software platform that includes software that “sets boundaries for agents”. “Artificial intelligence is extraordinary technology that will advance discovery, productivity, security, health, and prosperity for generations to come,” Mr Huang wrote on X.“But its full promise can only be realised when people have confidence that AI is being built to be safe and deployed with wisdom and responsibility.“This is bigger than a single product. It’s the beginning of an open ecosystem to build the trust layer for safe agent systems.” Nvidia CEO Jensen Huang. Picture: Philip FONG / AFPNvidia said more than 100 organisations are using the platform at its launch, including Microsoft, Perplexity, Accenture, and JPMorgan Chase. Nvidia executives said the new system could have prevented a recent incident where a swarm of AI agents developed by OpenAI autonomously hacked into AI infrastructure company Hugging Face.It comes after Prime Minister Anthony Albanese revealed an OpenAI agent infiltrated Medicare and three other systems in June, with the company only notifying Australia earlier this month.In a statement, Nvidia acknowledged a string of recent high profile incidents had eroded public trust.More CoverageBig question after Deputy PM’s Sam Altman meetingNathan SchmidtRogue AI spends cash, denies everythingAlex Blair“Several frontier labs have recently reported versions of the same story: AI agents broke out of the evaluation environments that were meant to contain them and reached systems they never should have been allowed to,” it said.“Some of the agents even misreported what they did. The security controls in place were insufficient.” This content was created in partnership with CommSec.Read related topics:InvestingMore related storiesAustralian MarketsASX up despite 15-year high interest ratesThe Australian sharemarket has risen despite interest rates being hiked to a 15-year high.Read moreAustralian MarketsASX defies rate hike fears to edge higherRising oil prices, a potential rate hike and falling miners could not stop the Australian sharemarket from closing in the green on Monday.Read moreMarkets$40bn cash windfall coming for AussiesAussie investors will receive billions in dividends paid by ASX-listed companies, with big names like Commonwealth Bank and Ampol paying out this week.Read more