Middle market private equity firm

GI Partners

  • HeadquartersSan Francisco, CA S5
  • Founded2001 S1
  • Websitegipartners.com
  • Last verifiedOctober 20, 2026

At a glance

Latest fundGI Partners Fund VI, $3.9B (Jun 2021) S5
Check sizeUp to $1.5B S3
Deal typesPlatform, Add-on, Growth S2
GeographyNorth America S3
SectorsSoftware & SaaS, IT Services & MSP, HVAC, Plumbing & Electrical, Cybersecurity, Insurance Brokerage, Construction Services, Environmental & Waste

What GI Partners buys

GI Partners is a San Francisco investment firm, founded in 2001, whose private equity group buys North American middle market companies in three areas: healthcare, services and software. It puts in initial equity of up to $1.5 billion for businesses valued at up to $2 billion when it invests, and it usually takes majority or co-control positions alongside management. Its most recent flagship fund, GI Partners Fund VI, closed in June 2021 with $3.9 billion.

Its current companies show what services means for GI: American Residential Services in residential HVAC and plumbing, Valet Living in doorstep trash collection for apartment communities, HES Facilities Management in school janitorial and grounds work, Single Digits and Flexential in managed networks and data centers, Atlas Technical Consultants in infrastructure testing and engineering, and Patriot Growth Insurance Services in insurance brokerage. The software side includes MRI Software, Egnyte and Sectigo. A smaller company is most likely to meet GI as an add-on to one of these platforms, since GI lists programmatic M&A as a core growth tool.

Recent deals

Announced in the 24 months before October 20, 2026.

DateCompanyTypeSectorSource
Oct 2026Clinical inkNew co-control investment from Fund VI alongside Ardan Equity; Fund V fully exited its earlier stakeInvestmentSoftware & SaaSSource
Jun 2026HES Facilities ManagementMajority investment in a janitorial, facilities and grounds services provider for schools and universities, with existing leaders staying onPlatformSource
May 2026Rose BioSolutionsCarve-out of Charles River Laboratories' cell and gene therapy manufacturing and cell solutions unitsPlatformSource
Aug 2025FlexentialSingle-asset continuation vehicle anchored by Hamilton Lane plus GI Data Infrastructure money, about $1 billion in allInvestmentIT Services & MSPSource
May 2025Tech-enabled MGA platformNew platform with insurance veterans Brad Emmons and Brian Hanuschak to buy and grow managing general agenciesPlatformSource
Feb 2025EgnyteMajority investment with TA in a secure content collaboration and governance software companyPlatformSoftware & SaaSSource
Jan 2025Entrust public certificate businessBought by Sectigo, roughly doubling its enterprise businessAdd-onCybersecuritySource
Oct 2024FlexentialMorgan Stanley Infrastructure Partners invested alongside GI in the data center and hybrid IT providerInvestmentIT Services & MSPSource

Portfolio by sector

From the firm's portfolio page S4.

Construction Services

  • Atlas Technical Consultants

Consumer & Food

  • Far Niente

Cybersecurity

  • Sectigo

Environmental & Waste

  • Valet Living

HVAC, Plumbing & Electrical

  • American Residential Services

Insurance Brokerage

  • Patriot Growth Insurance Services

IT Services & MSP

  • Flexential
  • Single Digits

Software & SaaS

  • Aras
  • Clinical Ink
  • Daxko
  • Doxim
  • eClinical Solutions
  • Egnyte
  • Euna Solutions
  • Insurity
  • MRI Software
  • Netsmart Technologies
  • Rectangle Health
  • Togetherwork

Other

  • Access
  • HES Facilities Management
  • Rose BioSolutions

Greymont’s take

How GI Partners fits a seller

GI Partners is a large buyer, so most owners will meet it through an existing platform rather than as a new investment. That makes it most relevant to owners of HVAC and plumbing contractors, insurance agencies, facilities and janitorial companies, valet trash and multifamily service providers, managed network and IT infrastructure firms, and vertical software businesses that could join American Residential Services, Patriot Growth, HES, Valet Living, Single Digits or one of its software companies. Its June 2026 HES deal was a majority investment that kept the existing leaders in place.

GI tends to hold companies for years and has used continuation vehicles and partial sales to stay invested, as it did with Flexential in 2024 and 2025 and Clinical ink in 2026. Owners selling into a GI platform should ask how long GI expects to own it, what the plan is for the next sale, and how rollover equity is treated.

Questions owners ask

What size companies does the GI Partners private equity group buy?

It targets the North American middle market, with initial equity of up to $1.5 billion and enterprise values of up to $2 billion at entry. It does not publish a revenue or EBITDA minimum.

Does GI Partners own an HVAC company?

Yes. American Residential Services, held since October 2020, is described by GI as the largest US provider of residential HVAC and plumbing maintenance and replacement, with more than 70 service centers in 23 states.

Does GI Partners invest in IT services and managed network providers?

Yes. Its private equity portfolio includes Single Digits, which runs secure managed wireless networks for hotels, student housing and apartment buildings, and Flexential, a colocation, cloud and managed services provider GI has backed since 2014.

Which fund is GI Partners investing from?

GI Partners Fund VI, which closed in June 2021 with $3.9 billion of commitments against a $3.25 billion target. Its October 2026 Clinical ink investment was made through Fund VI.

Sources

  1. S1GI Partners home page Accessed October 20, 2026
  2. S2GI Partners: Private Equity overview Accessed October 20, 2026
  3. S3GI Partners Private Equity: At-A-Glance investment criteria Accessed October 20, 2026
  4. S4GI Partners Private Equity: Portfolio companies (Active filter) Accessed October 20, 2026
  5. S5GI Partners Closes $3.9 Billion Private Equity Fund VI (June 21, 2021) Accessed October 20, 2026
  6. S6GI Partners news Accessed October 20, 2026
  7. S7GI Partners portfolio: American Residential Services Accessed October 20, 2026
  8. S8GI Partners portfolio: Single Digits Accessed October 20, 2026
  9. S9GI Partners portfolio: Flexential Accessed October 20, 2026
  10. S10GI Partners portfolio: Valet Living Accessed October 20, 2026

Compiled by Greymont Advisors from public sources, including the firm’s own website and press releases. Greymont is not affiliated with GI Partners. Figures are as reported on the dates shown and may have changed. Request a correction

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