BigBear.ai vs. Five9: Which AI-Driven Software Stock Is the Better Buy Now?

The article contrasts AI software companies BigBear.ai (BBAI) and Five9 (FIVN), presenting Five9 as the stronger investment. BigBear.ai, targeting government and defense, reported a Q1 2025 revenue miss at $34.8 million (+5% YoY) and an adjusted EBITDA loss of $7 million, signaling ongoing profitability struggles despite a substantial backlog. In contrast, cloud contact center AI provider Five9 delivered a robust Q1 2025 with $279.7 million revenue (+13.2% YoY), record free cash flow, and 29% EPS growth, trading at a significantly lower valuation of 1.71x trailing sales versus BBAI's 6.59x forward sales. This financial disparity and Five9's positive outlook, supported by a Zacks Rank #2 (Buy) compared to BBAI's #4 (Sell), underscore Five9's more established growth and attractive valuation.

Analysis

The comparison between Five9 (FIVN) and BigBear.ai (BBAI) reveals a stark contrast in operational maturity and financial stability within the AI software sector. Five9 demonstrates a robust and scalable enterprise SaaS model, evidenced by its strong first-quarter 2025 results which included a 13.2% year-over-year revenue increase to $279.7 million, exceeding guidance. Critically, the company is translating this growth into profitability, delivering record free cash flow of $34.9 million, an adjusted EBITDA margin of 18.8% (a 360-basis-point expansion), and a 29% increase in EPS. This performance is underpinned by strong demand for its AI solutions, with enterprise AI revenue surging 32% and strategic partnerships with major platforms like Salesforce and ServiceNow enhancing its ecosystem. In contrast, BigBear.ai presents a high-risk, high-reward profile heavily dependent on the government and defense sectors. While its backlog grew an impressive 30% to $385 million, its Q1 revenue of $34.8 million missed estimates, growing only 5% YoY, and it recorded an adjusted EBITDA loss of $7 million. This signals significant execution risk and lumpy revenue streams tied to volatile government funding cycles. The valuation disparity is also notable: FIVN trades at a modest 1.71x trailing sales despite its profitability and growth, whereas BBAI commands a much higher 6.59x forward sales multiple despite ongoing losses and widening analyst loss estimates, which are reflected in its Zacks Rank #4 (Sell) versus FIVN's #2 (Buy).

Key Decisions for Investors

• Given Five9's consistent execution, expanding margins, positive free cash flow, and a relatively low valuation of 1.71x trailing sales after a significant stock price decline, investors may find it an attractive, lower-risk play on enterprise AI adoption, especially with analysts projecting a 37.6% upside.
• Investors should approach BigBear.ai with caution, recognizing it as a highly speculative investment where the potential of its $385 million backlog is currently overshadowed by missed revenue targets, persistent losses, widening loss estimates, and a steep valuation.
• The primary factor for consideration is the divergent risk profiles: Five9 offers a proven model of profitable growth, while a position in BigBear.ai is a bet on a successful strategic pivot that can convert its government contract pipeline into sustainable, profitable commercial revenue, a metric that must be closely monitored.