System1 (SST) Q3 2025: Marketing Revenue Plunges 43% as Google AFD Sunset Forces Strategic Pivot

November 5, 2025 | By EarningsIQ Research

System1’s third quarter was defined by a sharp contraction in marketing revenue following Google’s abrupt AdSense for Domains (AFD) deprecation, forcing a rapid operational pivot and intensifying focus on product-led growth. Despite this disruption, product segment momentum and AI-driven innovation provided a foundation for future expansion. As marketing volatility subsides, management is betting on RSOC, privacy-first AI products, and direct user acquisition to drive a return to growth in 2026.

Summary

  • Google AFD Wind-Down Disrupts Marketing: Marketing revenue collapse exposes dependency and accelerates shift to RSOC and non-Google channels.
  • Product Segment Delivers Predictable Growth: Startpage, MapQuest, and CouponFollow drive session gains and anchor diversification strategy.
  • AI and Direct User Focus Set 2026 Trajectory: Leadership doubles down on privacy-centric AI and product innovation to reduce platform risk.

Performance Analysis

System1’s Q3 results were dominated by the fallout from Google’s deprecation of AFD, a monetization channel that previously accounted for up to 39% of marketing platform revenue over the prior six months. The abrupt end of AFD contributed to a 31% year-over-year revenue decline and a 43% drop in marketing revenue, with sequential revenue also down 21%. Adjusted gross profit and adjusted EBITDA both declined 4% year-over-year, reflecting the magnitude of the marketing contraction.

Despite this, the product segment—anchored by Startpage, MapQuest, and CouponFollow—showed resilience with 8% revenue growth and 23% more sessions year-over-year. However, sequential product revenue fell 6% as revenue per session declined by 16%, highlighting sensitivity to advertiser demand, particularly within CouponFollow due to tariff-related pullbacks. Product segment profit now represents 56% of total segment profit, up from 51% a year ago, signaling a meaningful shift in business mix.

  • Marketing Revenue Collapse: The loss of AFD drove a 43% YoY and 28% sequential drop in marketing revenue, revealing platform concentration risk.
  • Product Engagement Outpaces Monetization: Sessions surged 23% YoY, but falling revenue per session muted top-line growth.
  • Gross Profit Mix Shifts: Product segment now contributes a majority of segment profit, reflecting the company’s diversification imperative.

Operating expenses fell 4% YoY as management emphasized cost discipline, and liquidity remains solid with $54.6 million cash and no revolver draw, but leverage stands at 4.1x. The company is withholding Q4 guidance, citing recent volatility but expressing confidence in stabilization and renewed growth potential as RSOC and product initiatives ramp.

Executive Commentary

"Our strong execution was offset by a previously anticipated disruption to one of our primary monetization sources, Google. Specifically, in Q3, Google reduced monetization on its AdSense for Domains product, which we refer to as AFD, effectively sunsetting that product. AFD had historically been a significant part of our marketing business, and its effective deprecation had a negative impact on our own marketing and partner marketing business lines. While this Google volatility impacted results across our marketing segment, our core operations remained strong and we continued to deliver healthy profitability."

Michael Blend, Co-founder & Chief Executive Officer

"Delivering these results, despite having one of our main monetization sources be effectively deprecated, underscores the strength of our diverse operations and the stability of our broader business. We remain focused on expanding operating leverage and making disciplined investments growth."

Pritavesh Kadambi, Chief Financial Officer

Strategic Positioning

1. Marketing Platform Reset: From AFD to RSOC

System1’s marketing business is in the midst of a forced transformation. With Google’s AFD channel now fully sunset, the company has shifted focus to Google’s Related Search on Content (RSOC) product, where it claims market leadership. Management views RSOC as a larger, more durable opportunity. However, the transition has been disruptive, with AFD still contributing 27% of Q2 marketing revenue. The company is also building new non-Google monetization channels, including premium publishers and social media influencers, to further diversify traffic sources.

2. Product-Led Growth and Direct User Acquisition

The product segment is now the company’s growth engine, with Startpage (privacy search), MapQuest (consumer mapping), and CouponFollow (promo code aggregation) all posting session growth. New features and international expansion, such as CouponFollow’s launches in Germany and France, are driving engagement. Management is prioritizing direct user acquisition to reduce third-party platform risk, aiming for more predictable, defensible growth.

3. AI and Privacy-First Differentiation

AI integration is accelerating across the platform, with agentic coding—AI-driven software development—delivering efficiency gains and enabling rapid product iteration. The launch of Vanish, a private AI chat app from Startpage, exemplifies the company’s bet on privacy-centric AI. Leadership sees an opportunity to serve consumer needs for privacy in AI-powered interactions, especially in sensitive verticals like healthcare and legal.

4. Cost Discipline and Capital Allocation

Operating expenses are tightly managed, down 4% year-over-year, and liquidity is preserved with $54.6 million in cash. Investment is being redirected toward product innovation and scalable new launches, with a “build fast, kill fast” approach to new product bets. Management is prepared to increase product investment into 2026 as marketing volatility eases.

5. Quality Control and Ecosystem Integrity

System1 is actively addressing traffic quality issues after discovering invalid activity from a major partner. The company is pursuing reimbursement and considering legal action, signaling a commitment to maintaining high standards and ecosystem trust as it scales new channels.

Key Considerations

This quarter underscores a pivotal juncture for System1, as it is forced to accelerate its transition away from legacy marketing monetization and toward a product- and AI-driven model.

Key Considerations:

  • Platform Concentration Risk Realized: The AFD sunset exposed the fragility of relying on a single monetization partner, reinforcing the urgency of diversification.
  • Product Segment as Growth Stabilizer: Consistent session growth and new product launches in Startpage, MapQuest, and CouponFollow are providing a buffer against marketing volatility.
  • AI as a Strategic Enabler: Agentic coding and privacy-first AI products like Vanish are differentiating System1 and opening new addressable markets.
  • Direct User Acquisition Priority: Reducing SEO and third-party dependency will be key to margin stability and long-term defensibility.
  • Traffic Quality Vigilance: Ongoing disputes over invalid traffic highlight the importance of maintaining ecosystem trust as new channels are developed.

Risks

System1 faces ongoing risks from platform dependency, as further changes by Google or other partners could disrupt monetization. Product segment growth is vulnerable to shifts in advertiser demand and macroeconomic headwinds, as seen in CouponFollow’s tariff-driven revenue per session decline. Legal disputes over invalid traffic and a leverage ratio of 4.1x add further uncertainty, while the pace of user migration to new products remains an execution challenge.

Forward Outlook

For the next quarter, System1 did not provide formal guidance, citing recent volatility from the Google transition:

  • No Q4 2025 financial guidance issued
  • Management expects marketing volatility to subside and product segment growth to continue

For full-year 2025, management withheld updated guidance, but:

  • Anticipates stabilization in marketing as RSOC and new channels ramp
  • Plans to increase investment in direct user acquisition and AI-powered products

Management highlighted that the majority of Google-related volatility is now behind the company, and expects to resume guidance as visibility improves. The focus will be on scaling RSOC, expanding product features, and launching new AI-driven consumer agents in 2026.

Takeaways

System1’s Q3 marks an inflection point, with the forced sunset of AFD catalyzing a more urgent shift to product-led and AI-driven growth. The company’s ability to stabilize marketing revenue and capitalize on privacy-first AI innovation will determine whether it can return to a sustainable growth trajectory in 2026.

  • Business Model Reset: Marketing contraction exposes concentration risk, but product segment momentum and AI-driven launches provide a credible path forward.
  • Strategic Execution Watchpoint: Direct user acquisition and RSOC scaling are critical to rebuild revenue predictability and reduce platform risk.
  • 2026 Growth Hinges on Innovation: Success of privacy-centric AI products and new channel development will be the key investor watchpoints in the coming quarters.

Conclusion

System1’s Q3 was a test of resilience, with marketing revenue collapse forcing a strategic reset. While product-led growth and AI innovation offer a way forward, execution on user acquisition and channel diversification will be decisive as the company seeks to exit its marketing trough and return to growth in 2026.

Industry Read-Through

System1’s experience highlights the risks of overreliance on major platform partners, particularly for digital marketing and adtech firms. The Google AFD sunset is a reminder that even longstanding monetization channels can disappear quickly, forcing abrupt business model pivots. Adtech peers should prioritize diversification and direct user engagement, while the emergence of privacy-centric AI products signals a growing consumer demand for secure, private digital experiences. Advertisers and publishers should monitor the evolving dynamics between platforms, intermediaries, and end-user products, as the balance of power continues to shift in response to regulatory, privacy, and technology trends.

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