(Illustration by Hanna Barczyk)
The Vistria Group was founded in 2013 on the premise that private investment could generate both competitive returns and meaningful impact, two goals that work best together. Thirteen years later, with $17 billion in assets under management and a record of strong returns, that approach has proven durable across health care, financial services, housing, and education. Yet across private equity (PE), impact is still too often misunderstood and underestimated, especially when it comes to pricing the costs required to realize its value.
In PE, we’re accustomed to quantifying what we can easily measure: revenue growth, cost savings, market share. But the conditions that shape these fundamentals—stakeholder outcomes, workforce stability, access—rarely enter the model. When investors fail to price in the costs of achieving outcomes, they risk misjudging value creation and liabilities.
This blind spot reflects the ease of measuring financial data compared with the perceived complexity of assessing impact, compounded by a gap in training and tools. Most models see impact as a screening tool and aren’t designed to account for the costs—or upside—of optimizing impact for value. As a result, impact is too often treated as a reporting exercise, rather than as a priced component of the investment case.
Pricing impact performance into underwriting is strategic and directly supports financial outcomes and enterprise value. Building impact into underwriting and portfolio management can enable a middle-market general partner to become a top-decile performer. To achieve this at scale, impact must be linked to business fundamentals and incorporated into disciplined underwriting. When resourced and incentivized, impact becomes a driver of growth, resilience, and exit value.
Research backs our view. A recent New Private Markets report, for instance, finds that impact firms are top-performing growth capital managers. And a 2024 Impact- Alpha report about impact-value-creation playbooks by Tideline consultants Ben Thornley and Alok Patel demonstrates how operational rigor turns impact into value. By demanding pre-investment clarity about outcomes and what it will take—and cost—to achieve them, investors better ensure positive returns.
Too often we’ve seen companies face a misalignment between their missions and their growth plans. They fail to price in impact performance or adjust their capital structure to realize the value of impact at exit. So, we built a tool to address this issue. The Vistria Optimal Impact (VOI) model is our first pass at more clearly and consistently accounting for impact throughout the investment process. We use it to clarify costs and priorities, surface opportunities, and align decision makers on actions that improve outcomes for portfolio company consumers, strengthen communities, and create durable value.
The Model
Our work on the VOI model builds on two decades of progress in impact management. The global development of impact tools and frameworks (e.g., IRIS+, B Impact Assessment, Impact Management Project, SASB, SROI, 60 Decibels, and Impact Frontiers) has helped standardize measurement and define what strong practice looks like. They have also raised critical questions: What inputs are needed to achieve meaningful outcomes? What are the costs of delivering them at scale? What does it take to make impact investable?
The VOI builds on these initiatives with a PE focus, where impact strategy, operational excellence, culture, and time-bound impact value creation are integral to the investment thesis and shape outcomes for workers, communities, and investors. It integrates impact into the same disciplined processes that underwriting applies to other forms of risk and value. By embedding analysis into the investment life cycle, the VOI helps investors price both the costs of achieving outcomes and the long-term value they generate, ensuring that impact is treated as a core driver rather than an optional exercise.
VOI makes impact underwriting into a core investment method: It estimates the financial cost and upside of delivering outcomes, links them to performance indicators, and incorporates them into the investment case. It makes impact legible in investor terms—risk, return, and growth—while clarifying from the beginning what meaningful, measurable, and durable outcomes will require.
The principle behind it is simple: Most companies can deliver positive impact, but performance is optimized only when impact is planned, resourced, and incentivized as part of the core investment thesis. For us, pre-investment planning is critical in health care, education, housing, and financial services, where business success depends on access, quality, and outcomes aligned with policy goals. When investments in workforce, product quality, or stakeholder outcomes aren’t reflected early in the growth plan, such oversights can weigh on financial performance.
We’ve all seen examples. Imagine a behavioral health provider that delivers strong outcomes but cannot scale without investment in care coordination, or a special education platform that grows faster than it can respond to stakeholder needs. These aren’t anomalies—they signal an incomplete business case that fails to price what it takes to sustain outcomes.
The VOI model is designed to close this gap by integrating impact analysis into underwriting. It assesses where impact and enterprise value intersect and how to strengthen both during ownership. By consolidating qualitative and quantitative inputs into a standard output, the VOI informs diligence, guides active ownership, and supports exit planning. Like return on investment, it evaluates the value of impact—helping investors see what their capital enables in terms of real-world outcomes and what those outcomes mean for long-term value creation.
The VOI model evaluates four core drivers of impact performance, each of which has direct implications for enterprise value when properly prioritized and priced into the investment case:
Capability and capacity gauges impact readiness—leadership alignment, governance, and operational systems. Improvements raise the likelihood of sustained impact through stronger oversight, strategy, and execution.
Conduct measures baseline environmental, social, and governance (ESG) practices—compliance, climate strategy, supply-chain integrity, and stakeholder protections. These fundamentals function as risk safeguards, and they matter at exit: Buyers expect a sound foundation. Improvements reduce exposure, secure license to operate, and prepare companies for public and regulatory scrutiny.
Workforce assesses how the company builds an equitable, healthy, and engaged workforce—wages, inclusion, advancement, recruitment, and retention. A strong workforce drives productivity and resilience; investments improve service quality, cut churn, and strengthen long-term performance in people-dependent sectors.
Products and services impact measures how offerings affect target populations—access, quality, outcomes, and scale. Here business value and impact most directly converge. Strong performance builds customer trust, loyalty, and growth while unlocking underserved markets and unmet needs, driving differentiated product-market fit.
These drivers are supported by more than 100 data points assessed at each stage. By consolidating them into a single score, the VOI makes impact analysis actionable by informing diligence, guiding active ownership, and supporting exit planning. It prices the costs of achieving outcomes while making visible the long-term value they create.
For example, the VOI model flagged workforce attrition in a health-care platform we acquired, highlighting risks to service quality and patient experience. This insight guided targeted investments in improving the onboarding curriculum and experience, training managers on retention efforts, leveraging company initiatives to foster an inclusive culture, and partnering with a professional association to provide upskilling opportunities for employees. These efforts resulted in a 14 percent reduction in 30-day turnover and a 21 percent reduction in voluntary turnover for direct-support professionals.
In another case, the VOI model helped us assess how vertical integration could enhance outcomes for first-generation nursing students by improving program quality and relevance. By analyzing how educator support, high-quality instruction, and student services could reinforce persistence and completion, we identified opportunities to strengthen student success and, in turn, platform value through better outcomes for historically underserved populations. This includes a 68 percent graduation rate for first-generation college students, who often face additional barriers to academic success, and a 12 percent increase in student employment rates since 2020, indicating a strong return on investment for students.
Impact as Strategic Asset
The VOI not only strengthens underwriting but also shapes how impact is managed, resourced, and governed across the investment life cycle.
In diligence, the model maps achievable and critical outcomes, what it takes to deliver them, and how they may shape enterprise value. These insights appear directly alongside revenue, cost, and margin assumptions, making explicit the resources required to sustain outcomes.
During ownership, impact is tracked with the same rigor as financial indicators. Dashboards monitor both sets of metrics, leadership is accountable for progress, and board materials include outcomes as a regular agenda item. This discipline sharpens decisions, aligns management and investors, and ensures that impact is visible, planned for, and not absorbed as surprise costs or unsustainable benefits.
At exit, the VOI documents the capabilities built and outcomes achieved, linking them to the operational investments that made them possible, and helps to generate the road map to continue driving impact. This strengthens transition planning and can help surface buyers who recognize the durability of a business model where impact has been systematically resourced and priced into growth.
The model advances standardization. By creating a consistent score across companies, the VOI helps spot performance variation, identify common risks, and direct capital with an impact lens. The consistency also enables cross-portfolio collaboration—from shared workforce investments to amplifying value creation.
In short, the VOI reframes impact from a reporting exercise into a managed asset. By pricing the costs of outcomes and linking them to value, it shows that impact can be scaled, sustained, and valued as a core element of PE performance.
We don’t claim to have all the answers, but the questions are overdue. We’re testing a hypothesis and inviting others to help refine it. Impact remains one of the most undervalued sources of durable advantage. Pricing it in with rigorous, repeatable discipline allows investors to scale impact while bolstering enterprise value.
Read more stories by Kelly McCarthy & Jon Samuels.