# Ensono

Ensono is an Asset Manager based in Downers Grove, United States.

## Overview

- **Organization type:** Asset Manager
- **Headquarters:** Downers Grove, United States
- **Region:** North America
- **Address:** Downers Grove, IL, United States
- **Founded:** 2015
- **Assets under management:** Undisclosed
- **Website:** ensono.com
- **LinkedIn:** https://www.linkedin.com/company/ensono

## Regulatory record

- **Reports private funds:** No

## About

Ensono was formed in 2015 when private equity firms Charlesbank Capital Partners and M/C Partners acquired the IT outsourcing division of Acxiom, installing Jeff VonDeylen, a former Acxiom executive, as CEO. The transaction carved out a business managing mainframe, midrange, and cloud infrastructure for mid-market and enterprise clients. Acxiom retained no ownership stake, and Ensono began life with a portfolio of long-duration managed-services contracts attached to legacy infrastructure, giving it immediate cash-flow visibility uncommon in de novo technology platforms. The firm executes a strategy centered on acquiring and operating existing IT-outsourcing contracts, then layering hybrid-cloud migration, mainframe modernization, and public-cloud management services on top of those relationships. Asset-class exposure spans enterprise IT infrastructure, mainframe-as-a-service, multi-cloud management, and security operations. Ensono has completed bolt-on acquisitions to expand geographic reach and technical capability, including the 2018 purchase of Attenda, a UK-based managed-services provider, and the 2019 integration of Wipro's hosted data-center services business. Confirmed client relationships include the Illinois Department of Innovation & Technology and the UK's Driver and Vehicle Licensing Agency (DVLA), reflecting a posture toward regulated, mission-critical workloads. The firm operates across North America and Western Europe, with delivery centers in the United States, United Kingdom, and India. Ensono has disclosed over $700 million in annual revenue (per CRN, 2023) and employs more than 2,900 people globally. Offices include Downers Grove, Illinois; London, UK; and Pune and Chennai, India. The firm is not a family office or an asset allocator; it is a portfolio company held by private equity sponsors. May 2022: Charlesbank Capital Partners and M/C Partners sold a majority stake in Ensono to KKR, valuing the firm at approximately $1.7 billion, while CEO Jeff VonDeylen and the management team retained a significant minority position (per KKR and the firm, May 2022). Ensono is structurally distinct in that it operates as a PE-backed roll-up platform within the IT-managed-services sector rather than a standalone service provider. The 2022 majority sale to KKR introduced a new capital layer explicitly focused on accelerating M&A, positioning the firm to consolidate a fragmented infrastructure-services market. This architecture — where the management team retains equity alongside sequential private equity sponsors — creates a governance model driven by acquisition-led growth and eventual liquidity events.

## Sectors

- Enterprise Software
- AI/ML
- Cybersecurity

## People

- Jeff VonDeylen — CEO

## Questions

### Who controls Ensono investment and strategic decisions?

KKR acquired a majority stake in the company in 2022 from prior sponsors Charlesbank Capital Partners and M/C Partners, inheriting board control. CEO Jeff VonDeylen and the existing management team retained a significant minority position and lead operational and strategic execution. Investment decisions — particularly M&A targeting additional managed-services contracts — are made by management in concert with the KKR-appointed board.

### How did the sponsor transition from Charlesbank to KKR change the firm?

The 2022 sale provided KKR with a platform explicitly aimed at scaling through acquisition in the fragmented IT-services market. Unlike the early-stage carve-out phase under Charlesbank, the KKR era is capital-rich and focused on accelerating mainframe-to-cloud migrations, geographic expansion in Europe, and adding adjacent technical capabilities via buy-and-build. Management retained material equity, preserving operational continuity.

### What does Ensono actually do for a typical client?

Ensono assumes long-term operational responsibility for a client's existing IT infrastructure stack — mainframe, midrange servers, private data centers — and then manages a phased migration of workloads toward public cloud platforms, predominantly Microsoft Azure and AWS. The firm also provides ongoing managed services for security, mainframe optimization, and hybrid-cloud operations. Many contracts originate as legacy outsourcing agreements that Ensono acquires or inherits.

### What is Ensono's known posture on acquiring mainframe workloads?

Mainframe management is a core differentiator and a primary acquisition target for the firm. Ensono actively seeks to acquire existing mainframe services contracts and modernize those workloads in-place or via re-platforming, recognizing that the shrinking pool of mainframe-literate engineers creates sticky, high-retention revenue streams. The 2019 purchase of Wipro's hosted data-center business and the 2018 Attenda deal both broadened its mainframe and infrastructure footprint.

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Updated: 2026-06-03T20:00:00.000Z

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