PubMatic, a leading Supply-Side Platform (SSP), announced its fourth-quarter and full-year 2025 financial results, revealing a period of revenue decline that the company, however, framed as a strategic inflection point. While Q4 2025 revenue stood at $80 million, a 6% decrease year-over-year, and full-year revenue reached $282.9 million, down 3% from the previous year, the company highlighted that these figures surpassed internal projections. This performance, coupled with a robust outlook driven by the adoption of its proprietary agentic AI technology, AgenticOS, and growth in key channels like Connected TV (CTV) and mobile, appears to have resonated with investors, as PubMatic’s stock saw a notable increase of approximately 6% in after-hours trading.
The financial performance, despite the year-over-year dip, was attributed by PubMatic CFO Steve Pantelick to a confluence of factors, primarily a significant downturn followed by a subsequent normalization of spend from an unnamed, large incumbent Demand-Side Platform (DSP). While not explicitly named, market speculation strongly suggests this partner to be The Trade Desk, a major player in the programmatic advertising ecosystem. To mitigate the impact of this large partner’s recalibrated spending, PubMatic has strategically diversified its DSP relationships, actively onboarding new midtier partners that exhibit substantial growth potential.
Looking ahead, PubMatic CEO Rajeev Goel expressed optimism, forecasting double-digit business growth in the latter half of 2026. This projection is underpinned by the increasing adoption of PubMatic’s AgenticOS, robust demand in the CTV and mobile sectors, and a resurgence in display advertising. The company’s forward-looking strategy is heavily anchored in its commitment to becoming a leader in the burgeoning field of agentic artificial intelligence within the digital advertising landscape.
The Rise of Agentic AI in Advertising
PubMatic’s strategic pivot towards agentic AI is central to its long-term vision. Goel projected that by 2028, a significant 25% of all digital advertising transactions will be "executed autonomously via agentic AI," with this share projected to climb to 50% by 2030. This ambitious forecast underscores the transformative potential of AI-driven automation in the programmatic advertising ecosystem.
The company’s proactive stance in this domain is exemplified by the launch of its AgenticOS platform and its active participation in the development of the Ad Context Protocol. This protocol aims to enhance the understanding and contextualization of ad demand, a critical component for effective agentic execution. Since its inception, PubMatic has reported a substantial volume of agentic ad campaigns, exceeding 250 since its first agent-executed CTV campaign in partnership with the agency Butler/Till in January.
These agentic campaigns have not only demonstrated the viability of automated ad execution but have also attracted new advertisers to PubMatic’s platform, signaling the generation of incremental revenue. Furthermore, PubMatic is capitalizing on the adoption of AgenticOS by implementing additional fees beyond its standard SSP take rate. This creates a new, distinct revenue stream, akin to the additional fees generated through its Activate direct-to-buyer connection, thereby expanding the company’s financial avenues outside of its existing margin structures.
To accelerate partner adoption of this cutting-edge technology, PubMatic launched an AI accelerator program. The overwhelming response, with nearly 100 brands, agencies, and streaming platforms already enrolled, has been lauded by Goel as the "fastest early-stage adoption of any product we’ve launched," indicating strong market receptiveness to their AI initiatives.
Navigating the Evolving DSP Landscape
Beyond the transformative impact of agentic AI, PubMatic’s financial performance and strategic direction are also shaped by its evolving relationships with DSP partners. The full-year 2025 revenue figures were notably impacted by The Trade Desk’s decision in August 2025 to reclassify all SSPs as resellers. This classification prompted The Trade Desk to increase its utilization of OpenPath, its direct-to-publisher connection technology, effectively bypassing SSPs in certain supply chain pathways.
Both Goel and Pantelick alluded to the significant influence of an unnamed DSP partner on PubMatic’s third-quarter revenue, noting a period of reduced spend that stabilized around August and September. Pantelick provided further context, estimating that excluding the impact of this specific DSP and the significant influx of political advertising spend in 2024, PubMatic’s revenue would have shown a robust 18% year-over-year increase in Q4 and a 9% increase for the full year 2025.
PubMatic’s growth strategy prioritizes the diversification of its DSP partner mix. This involves actively cultivating relationships with midtier and specialist platforms, a move that has already seen the addition of 50 new DSP partners. The company has also strategically "reshaped the mix of our largest DSPs towards fast-growing commerce and high-value ad verticals like Pharma," indicating a focus on partnering with platforms that align with high-growth sectors.
In a noteworthy development that potentially signals the intensifying competition between Amazon and The Trade Desk, Amazon DSP has emerged as a top-five buyer on PubMatic’s platform. This strategic shift highlights the dynamic nature of the ad tech landscape and the strategic importance of major players like Amazon in the programmatic ecosystem.
The impact of PubMatic’s diversification strategy is already evident in its financial results. Ad spend from mid-market DSPs experienced a substantial 30% year-over-year increase in Q4 2025. This segment, representing mid-market advertisers, was identified by Pantelick as the "fastest-growing segment of the market" in the past year, underscoring the strategic importance of this partnership focus.
PubMatic’s Five-Point Growth Plan
The diversification of DSP partners represents the first pillar of PubMatic’s comprehensive five-point growth plan. The second key initiative is the expansion of its Activate direct-to-buyer business, which experienced an impressive threefold increase in Q4 2025. Activate, a significant component of PubMatic’s supply-path optimization efforts, accounted for a substantial 55% of the total activity on the company’s platform in 2025, demonstrating its increasing importance in streamlining ad transactions.
The third point on PubMatic’s agenda is the sustained growth in its CTV and mobile segments, alongside the development of emerging revenue streams. Excluding the impact of 2024 political ad spend, PubMatic’s CTV revenue demonstrated exceptional growth, with a 50% year-over-year increase in Q4 2025. Mobile app growth also remained strong, registering a 25% increase for the quarter. Emerging revenues, which encompass Activate, commerce media, and new AI solutions, surged by 75% in Q4, now constituting nearly 10% of PubMatic’s total revenue. Concurrently, PubMatic’s established display advertising business showed resilience, with a 20% increase in Q4.
The fourth and fifth points of PubMatic’s growth strategy are dedicated to the advancement of emerging AI solutions and internal AI optimizations, respectively. The company’s commitment to AI is evident in its internal development processes, with 40% of new code written in the latter half of 2025 being AI-generated. Currently, 10% of PubMatic’s publishers are generating revenue from AI-driven solutions, including AgenticOS and other publisher-facing products. Goel expressed his ambition for this figure to eventually reach 100%, stating, "It’s great that it’s in double digits, but that number should be 100% eventually. We’re still early, and there’s a lot of runway ahead of us." This forward-looking perspective highlights PubMatic’s conviction in the long-term impact and potential of AI across its entire product suite and publisher network.
Industry Context and Future Implications
PubMatic’s financial report and strategic pronouncements arrive at a critical juncture for the digital advertising industry. The increasing complexity of privacy regulations, the ongoing deprecation of third-party cookies, and the relentless pursuit of greater efficiency and transparency in programmatic transactions are collectively pushing the industry towards significant structural changes. The rise of agentic AI, as championed by PubMatic, represents a potential solution to many of these challenges, promising more intelligent, automated, and potentially more privacy-compliant advertising processes.
The company’s emphasis on diversifying its DSP relationships also reflects a broader industry trend. As major platforms consolidate their own supply paths and influence spending decisions, SSPs are under pressure to demonstrate unique value propositions and build robust relationships across a wider spectrum of demand partners. The success of PubMatic’s midtier DSP strategy could serve as a blueprint for other SSPs seeking to navigate a landscape increasingly dominated by large, vertically integrated players.
The performance of PubMatic’s CTV and mobile businesses further underscores the continued shift of advertising spend towards these high-growth channels. As consumers increasingly consume content on connected devices and mobile applications, advertisers are following suit, demanding more sophisticated solutions for reaching these audiences programmatically. PubMatic’s investment in these areas, alongside its nascent commerce media and AI-driven offerings, positions it to capitalize on these evolving consumer behaviors.
The company’s proactive engagement with emerging technologies like agentic AI and its strategic partnerships, such as with Butler/Till, suggest a forward-thinking approach that could redefine the operational paradigms of digital advertising. The ability of AgenticOS to not only automate campaigns but also to attract new business and generate additional revenue streams indicates a promising path to sustained growth.
However, the industry’s transition to agentic AI will not be without its challenges. Concerns around data privacy, algorithmic bias, and the potential for job displacement within the ad tech sector will need to be addressed proactively. PubMatic’s participation in industry initiatives like the Ad Context Protocol signals an understanding of these complexities and a commitment to fostering a more responsible and ethical AI-driven advertising future.
The coming years will be pivotal for PubMatic and the broader ad tech industry. The company’s ability to successfully execute its five-point growth plan, particularly its vision for agentic AI, will determine its trajectory in a rapidly evolving digital advertising ecosystem. The initial investor reaction suggests a confidence in PubMatic’s strategic direction, but the true test will lie in its ability to translate these ambitious plans into consistent, profitable growth.
