HFS Non-Linearity Index: HFS Research Report
The FTE-era yardstick is breaking down
For years, headcount was the industry's proxy for growth - more people, more revenue. HFS Research's latest report, The Headcount Era Is Fading as the Pivot to Services-as-Software Continues, tests whether that's still true across more than 25 major service providers. Its Non-Linearity Index measures revenue and operating margin per employee instead, and finds a small group already growing value faster than headcount.
Firstsource is one of only six providers HFS has tracked doing this for four consecutive quarters, with FY26 revenue up about 20% while headcount also grew, by around 4.5%. That shift didn't start with AI. Firstsource has built its delivery model around outcomes, not seats, for several years. AI is simply accelerating a model that was already in motion.
What the report includes:
- The full Non-Linearity Index matrix, plotting 25+ global providers on revenue-per-employee and margin-per-employee growth
- Firstsource's individual profile: HFS's independent read on what is driving its growth, including automation, personalization engines, and workflow orchestration in digital collections and customer operations
- A 202-respondent enterprise survey on pricing preferences shifting from FTE-based billing toward outcome- and consumption-based models
- HFS's index methodology, including how it adjusts for restructuring, M&A, and other one-off effects
Key findings
AI adoption is outpacing non-linear results
Nearly every provider is deploying AI and platform-led delivery. Across the market, revenue per employee grew about 1.7% and margin per employee grew about 6.5%, concentrated among a handful of providers.
Firstsource is one of six Consecutive Leaders
Of the 11 providers outperforming the market this cycle, only six sustained that growth for four straight quarters. Firstsource is one of them, posting FY26 revenue growth of about 20% against headcount growth of about 4.5%.
Enterprises are ready to pay differently
A companion survey of 202 senior enterprise leaders found FTE-based pricing, used by 65% of buyers today, is expected to shrink sharply over the next two years. Outcome- and consumption-based pricing is expected to grow in its place.
Few providers deliver the value enterprises expect
AI investment is widespread across the industry, but HFS found only a small group converting it into consistent revenue and margin gains. HFS calls this a capability divide, not a spending one.
Intelligence That Operates drives Firstsource's numbers
HFS credits Firstsource's shift to a full-stack, outcome-linked delivery model for its consistent performance. That model is delivered through Kairos, Firstsource's operating system for AI-native operations.
Non-linearity is becoming a core buying criterion
HFS expects enterprises to increasingly evaluate providers on their ability to prove non-linearity with hard evidence. That divide will separate the partners worth scaling from those without proof behind their AI story.