Viant (DSP) Q1 2025: CTV Share Hits 45% as Incremental Lift Drives Advertiser Shift

2025-05-07 | By EarningsIQ Research

Viant’s Q1 2025 saw a decisive inflection in advertiser strategy, with connected TV (CTV) now accounting for 45% of platform spend, propelled by a shift toward incremental lift measurement and away from legacy last-touch attribution. Operational discipline and tailored AI offerings are accelerating Viant’s upmarket momentum, even as macro headwinds prompt some spend to move into the second half. Investors should watch for further CTV mix gains and the scaling impact of Viant AI as secular tailwinds intensify.

Summary

• CTV Mix Surges: Advertisers rapidly pivoted spend to CTV, now 45% of platform volume.
• Incremental Lift Adoption: Measurement priorities are upending legacy attribution, fueling channel reallocation.
• AI and Addressability Flywheel: Viant’s transparent, workflow-simplifying AI and identity tools are broadening its advertiser base.

Performance Analysis

Viant delivered a record-setting Q1 2025, with revenue and contribution XTAC (ex-tac, Viant’s net platform take) both exceeding guidance and showing robust year-over-year growth. CTV continued as the dominant growth engine, now representing the largest share of spend in company history. Emerging digital channels—CTV, streaming audio, and digital out-of-home—combined for 54% of total spend, reflecting a structural shift in advertiser channel preference. The top 100 customers grew contribution XTAC by 24% YoY, and new customer wins are not only accelerating but skewing larger, with average contribution XTAC from the top 30 new clients more than tripling from last year.

Operational efficiency also improved, with contribution XTAC per employee up 13% over the trailing 12 months. Non-GAAP operating expenses rose 20% YoY, but were flat sequentially, even as Viant absorbed costs from two recent acquisitions. Adjusted EBITDA margin expanded 360 basis points, demonstrating Viant’s ability to scale profitably while investing in AI and integrating new capabilities. The company’s opportunistic buyback activity—$17 million in Q1 and $46.5 million since May 2024—signals confidence in its market positioning and valuation.

• CTV as Core Growth Engine: CTV spend reached an all-time high and now comprises nearly half of all ad spend on the platform.
• Customer Base Deepening: Larger and more strategic accounts are driving both revenue and contribution XTAC growth.
• Expense Discipline: Organic non-GAAP opex rose just 14% YoY, underscoring operational leverage even as AI and acquisitions scale.

Despite some Q2 spend deferrals (3-4% of revenue) due to tariff-related uncertainty, Viant’s fundamentals remain underpinned by secular channel shifts and rising advertiser sophistication.

Executive Commentary

Strategic Positioning

1. CTV and Direct Access as Platform Differentiators

CTV, connected TV advertising, is now the centerpiece of Viant’s growth strategy, with over 45% of spend and more than half of CTV volume flowing through its Direct Access program. Direct Access, which connects advertisers directly to premium inventory without intermediary fees, not only enhances campaign efficiency but also increases win rates for impressions. This approach is resonating with agencies and brands seeking to maximize working media and minimize ad tech “taxes.”

2. Incremental Lift and Attribution Shift

Viant is capitalizing on a wave of advertiser re-education, as clients increasingly reject last-touch attribution in favor of incremental lift measurement. Household ID, Viant’s patented people-based identifier, is a core enabler—now powering a 33% YoY increase in ad spend and a 500% two-year surge. As more advertisers prioritize channels that demonstrably drive new customer acquisition, Viant’s platform is becoming the default for incrementality experiments, especially in CTV.

3. AI Product Suite Accelerating Adoption

Viant’s AI suite is moving through a four-phase rollout—bidding, planning, measurement, and decisioning. AI bidding now automates 85% of ad spend and drove a 75% YoY gain in contribution XTAC from AI-powered campaigns. The upcoming launch of AI measurement and analysis promises to further streamline reporting and campaign optimization, while AI decisioning will eventually enable fully autonomous media buying. This AI-driven simplification is poised to unlock new advertiser segments, particularly among data-driven and mid-market clients.

4. Competitive Moats: Independence and Transparency

Viant’s independence from walled gardens (such as Google and Amazon) is a recurring theme, with management emphasizing that both advertisers and publishers trust Viant to handle first-party data. The company’s transparent, value-based pricing—eschewing incremental fees for Direct Access—contrasts with larger rivals and appeals to agencies frustrated by rising ad tech stack costs.

5. Capital Allocation and Buybacks

Viant’s aggressive share repurchases—nearly exhausting its initial $50 million authorization and adding another $50 million—reflect management’s conviction in long-term value creation and a willingness to capitalize on market volatility.

Key Considerations

Viant’s Q1 2025 demonstrates the power of aligning with secular channel shifts and advertiser measurement sophistication. The company’s focus on CTV, addressability, and AI-driven workflow simplification is yielding both top-line momentum and margin expansion. However, near-term macro uncertainty and competitive intensity remain watchpoints.

Key Considerations:

• CTV Channel Penetration: Continued CTV share gains signal a durable, high-growth revenue mix shift.
• Advertiser Measurement Evolution: Incremental lift is rapidly becoming the new standard, with Viant’s tools well positioned to benefit.
• AI Platform Leverage: Workflow automation and campaign optimization are attracting larger and more sophisticated clients.
• Operational Leverage: Margin expansion is being achieved even as Viant invests in technology and integration.
• Buyback Strategy: Opportunistic repurchases reinforce management’s conviction and support valuation.

Risks

Macro headwinds, such as tariff-driven supply chain disruptions, have led some advertisers to delay spend, introducing near-term forecasting variability. Competitive threats remain from both large platforms (Google, Amazon) and mid-market DSPs, especially as attribution models and data access evolve. Regulatory shifts and industry consolidation could also alter the landscape, particularly if Google’s ad tech assets are divested or if walled gardens adjust data sharing policies.

Forward Outlook

For Q2 2025, Viant guided to:

• Revenue of $77 to $80 million (19% YoY growth at midpoint)
• Contribution XTAC of $47.5 to $49.5 million (17% YoY growth at midpoint)
• Adjusted EBITDA of $10.5 to $11.5 million (15% YoY growth at midpoint)

For full-year 2025, management reiterated its commitment to margin expansion and continued outperformance versus the broader programmatic market. Spend deferrals are seen as temporary, with the majority expected to materialize in the second half. Factors influencing the outlook include:

• Resilient advertiser demand, especially in CTV and emerging digital channels
• Ongoing adoption of AI and addressability solutions by new and existing clients

Takeaways

Viant is executing on a clear secular playbook—gaining CTV share, winning the attribution narrative, and leveraging AI to unlock new advertiser segments. Margin expansion and disciplined capital allocation reinforce its competitive stance, but investors should monitor for shifts in macro conditions and competitive responses.

• CTV and Incrementality Drive Growth: The pivot to CTV and incremental lift measurement is structurally expanding Viant’s addressable market and wallet share.
• AI as a Differentiator: Automated bidding and campaign planning are lowering barriers for mid-market and data-driven advertisers.
• Macro and Industry Risks: Tariff-related spend delays and evolving competitive dynamics require close attention, especially as platform models converge.

Conclusion

Viant’s Q1 2025 results showcase the compounding effects of aligning with secular channel shifts and advertiser measurement sophistication. As CTV and AI adoption deepen, Viant’s platform is positioned for continued share gains, though execution and macro vigilance remain essential.

Industry Read-Through

Viant’s performance and commentary highlight a pivotal moment for digital advertising: the industry is moving away from last-touch attribution and toward incremental lift as the core metric, with CTV emerging as the centerpiece of omnichannel strategy. This shift will likely pressure legacy display, search, and social budgets, while creating opportunities for independent DSPs and measurement providers. The growing importance of transparent, value-based pricing and addressability solutions will force incumbents to rethink their data and fee structures. For the sector, the message is clear: measurement sophistication and channel mix agility are the new competitive moats.

DSP Technology Advertising CTV AI Attribution Buybacks