Five9, Inc. (NASDAQ:FIVN) is one of the fastest-growing agentic AI stocks to buy<\/strong>. One of the freshest company-specific signals came on March 10, 2026, when Five9 expanded its Fusion ecosystem and introduced a new AI Agent Connect integration API designed to let enterprises connect voice AI agents with third-party systems.<\/p>\n The point of the launch was not just another AI badge on a slide deck. Five9 said the program is meant to connect AI agents, data, and business systems so enterprises can orchestrate customer experience workflows across a broader ecosystem. That makes it a pretty direct fit for an agentic AI thesis, because the company is pushing beyond isolated chat or assist tools and toward systems that can act across workflows.<\/p>\n The growth backdrop is solid enough to support that angle. in late February, Five9 reported fourth-quarter 2025 revenue of $300.3 million, up 8% year over year, while full-year revenue rose 10% to $1.149 billion. More importantly for the thesis here, Five9 said fourth-quarter enterprise AI revenue grew 50% year over year. At a Morgan Stanley conference on March 3, 2026, management also said it expected double-digit revenue growth in the latter half of 2026, supported by backlog and AI adoption.<\/p>\n Five9, Inc. (NASDAQ:FIVN) provides cloud contact-center software and AI tools that help enterprises manage customer interactions across voice, digital, and workflow channels.<\/p>\n While we acknowledge the potential of FIVN as an investment, we believe certain AI stocks offer greater upside potential and carry less downside risk. If you’re looking for an extremely undervalued AI stock that also stands to benefit significantly from Trump-era tariffs and the onshoring trend, see our free report on the best short-term AI stock<\/b>.<\/p>\n READ NEXT: <\/b>33 Stocks That Should Double in 3 Years<\/b> and <\/b>15 Stocks That Will Make You Rich in 10 Years<\/b>.<\/p>\n Disclosure: None. Follow Insider Monkey on Google News<\/b>.<\/p>\n<\/p><\/div>\n<\/div>\n<\/div>