ISG (III) Q4 2025: As-a-Service ACV Jumps 29%, Cloud and AI Redefine Market Leadership
Enterprise demand for as-a-service models surged in Q4, pushing annual contract value (ACV) up 29% and solidifying cloud and AI as the industry’s primary engines of growth. Managed services lagged, with growth concentrated in select regions and verticals, while deal structures and durations evolved to reflect deeper transformation agendas. Looking ahead, AI-driven platforms and consumption-based economics are set to widen the gap between traditional and next-generation IT services, with providers facing mounting pressure to adapt pricing, delivery, and value measurement to meet rapidly shifting enterprise expectations.
Summary
- Cloud and AI-Driven Demand: As-a-service ACV expansion outpaces legacy managed services, with hyperscalers and AI workloads fueling growth.
- Deal Structure Evolution: Longer contract durations and outcome-focused pricing models reshape vendor-client relationships.
- Regional and Segment Divergence: Americas and EMEA drive gains, while Asia-Pacific and traditional BPO remain under pressure.
Performance Analysis
ISG’s Q4 results underscore a decisive market pivot toward cloud, AI, and platform-centric services. The global combined market hit $34.3 billion in ACV for the quarter, up 16% year-over-year, and full-year growth reached 18%—the highest since 2021. The as-a-service segment, which now accounts for 66% of total ACV, powered this expansion with a 29% annual growth rate, while managed services grew just 1.3%.
Cloud infrastructure (IaaS, infrastructure-as-a-service, cloud computing sold on a usage basis) was the largest driver, with annual ACV rising 33% to $64.7 billion. Hyperscalers—AWS, Microsoft, Google—captured 75% of IaaS ACV and posted 37% growth in Q4. SaaS (software-as-a-service, subscription-based software delivery) also delivered steady gains, up 16% for the year, with AI-centric platforms and collaboration tools leading.
- Engineering Services Outperformance: Engineering ACV climbed 35% annually, led by software and embedded engineering and larger, more global deals.
- BPO Stabilization, But Annual Weakness: BPO (business process outsourcing, contracting back-office and customer-facing functions) saw Q4 momentum (+13% ACV) but finished 2025 down 14% year-over-year.
- Managed Services Divergence: Americas posted record managed services ACV (+9%), while EMEA stabilized late in the year and Asia-Pacific contracted sharply (-27%).
Deal durations extended by 12% as transformation projects replaced simple labor arbitrage, and mega deals declined in favor of more numerous, sizable sub-mega contracts. Industry verticals showed mixed trends, with energy and healthcare outperforming, while manufacturing and retail lagged.
Executive Commentary
"2025 was really a solid year for the outsourcing market. Growth, though, was concentrated in cloud, infrastructure, engineering, and AI-related demand, while more traditional labor-centric services remained under pressure."
Steve Hall, Chief AI Officer
"The as-a-service market is now firmly the growth engine of the market, reflecting enterprise prioritization on platforms, consumption-based models, and of course, AI capabilities."
Steve Hall, Chief AI Officer
Strategic Positioning
1. As-a-Service Becomes the Core Growth Engine
As-a-service models now account for two-thirds of market ACV, cementing a secular shift away from labor-based managed services. Hyperscaler-led cloud and AI workloads are driving record demand, with infrastructure and analytics platforms leading adoption.
2. Deal Structures and Commercial Models in Transition
Contract durations are lengthening and pricing is shifting toward outcome-based and autonomy-level models, reflecting a move from simple FTE reductions to AI-enabled transformation. Procurement teams are adapting to new agentic and value-focused pricing, though education and model maturity remain in progress.
3. Regional and Vertical Fragmentation
Americas and EMEA are the primary sources of growth, with the former setting new records in managed services and the latter stabilizing after volatility. Asia-Pacific is under sustained pressure, except for India’s GCC (Global Capability Center, internal captive delivery centers) activity. Verticals like energy and healthcare are outperforming as digital and AI transformation accelerates in these sectors.
4. Engineering and Platform-Led Transformation
Engineering services are scaling rapidly, with larger, more complex, and multinational deals. Software and embedded engineering are the fastest-growing subsegments, reflecting the need for modernization and AI-enabled product development.
5. BPO and GCCs: From Cost Play to Transformation Partner
BPO is pivoting from traditional outsourcing to domain-led, AI-infused transformation, especially in finance, accounting, and customer experience. GCCs are increasingly seen as complementary to managed services, not a replacement, with providers supporting setup and transformation for global clients.
Key Considerations
This quarter signals a market in transition, with legacy models giving way to platform, AI, and consumption-based economics. Providers and clients are rethinking value, pricing, and delivery as digital transformation accelerates.
Key Considerations:
- AI as a Market Shaper: AI is now driving both demand and margin pressure, forcing providers to adapt service models and pricing to new productivity baselines.
- Deal Duration and Complexity: Longer, transformation-centric contracts reflect the need for deeper change management and phased technology adoption.
- Provider Consolidation and Ecosystem Simplification: Enterprises are consolidating providers for efficiency, putting mid-tier vendors at risk unless they can differentiate with AI and niche expertise.
- Outcome and Value-Based Pricing Adoption: Transitioning from FTE to autonomy and outcome pricing is a work in progress, with procurement and providers still aligning on value measurement.
Risks
Macroeconomic uncertainty, including policy shifts, tariffs, and regional economic weakness, could constrain discretionary spending and delay transformation projects. Providers face execution risk as they recalibrate delivery and pricing models for AI-driven outcomes, while clients may experience adoption friction due to organizational change management and skills gaps. Intensifying competition among hyperscalers and SaaS leaders could further compress margins and accelerate industry consolidation.
Forward Outlook
For 2026, ISG guided to:
- Managed services ACV growth of 2.1% (modest improvement over 2025’s 1.3%)
- As-a-service ACV forecasted at 20% growth, driven by continued cloud, AI, cybersecurity, and platform investments
Management highlighted:
- Continued divergence between as-a-service and managed services, with the former as the clear growth engine
- AI adoption, platform migration, and selective enterprise spending as key drivers of 2026 performance
Takeaways
ISG’s Q4 and full-year results confirm a decisive market pivot toward cloud, AI, and platform-centric models, with as-a-service now the dominant source of growth and margin expansion. Legacy managed services and BPO are under pressure to evolve, as deal structures, pricing, and value measurement shift toward outcomes and transformation. Regional and segment divergence is intensifying, with Americas and select verticals leading, while Asia-Pacific and traditional BPO face structural headwinds.
- Cloud and AI-Driven Growth: Infrastructure and SaaS adoption are outpacing legacy models, with hyperscalers and AI workloads at the center of demand.
- Transformation-Focused Deals: Longer durations and outcome-based pricing reflect deeper, more complex enterprise change agendas.
- 2026 Watchpoints: Provider adaptation to AI economics, deal structure innovation, and regional recovery in managed services will be key investor focus areas.
Conclusion
ISG’s Q4 2025 results spotlight a market undergoing rapid transformation, as cloud, AI, and platform models reshape industry economics and competitive positioning. Sustained as-a-service growth, evolving deal structures, and intensifying regional divergence set the stage for a 2026 defined by provider adaptability and enterprise selectivity.
Industry Read-Through
The surge in as-a-service ACV and hyperscaler-led cloud growth is a clear read-through for all IT and business services providers: legacy labor models are being replaced by platform, AI, and consumption-based offerings. Providers unable to transition to outcome-driven, AI-enabled delivery risk margin compression and share loss. The shift toward longer, more complex contracts and value-based pricing will ripple across consulting, software, and infrastructure segments. Enterprises across industries should expect continued provider consolidation, more selective partnerships, and a premium on digital and AI transformation expertise.