Partnering with great companies to drive growth

The right partner changes everything

We build great companies and create lasting value.
It’s all about partnership and collaboration, built on a foundation of trust and transparency. Our team leverages deep sector knowledge and operating expertise to drive a shared vision for success.

See how

Our funds

Our team has managed or deployed $50 billion of equity capital, worked with over 180 partner companies around the world and fueled more than 700 add-on acquisitions representing an aggregate enterprise value of over $270 billion.

Flagship funds

THL is currently investing from Fund X, the firm’s tenth flagship fund. We partner with companies in 16 identified sectors across three industry verticals: Financial Technology & Services, Healthcare and Technology & Business Solutions.

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Automation fund

THL’s Automation Fund helps companies drive digital transformation across diverse end markets—from agriculture and semiconductor manufacturing, to healthcare and eCommerce. Our automation partners work to address important societal challenges and unlock economic opportunity around the globe.

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I’m interested in learning more about

  • Financial Technology & Services (FTS)
  • Healthcare (HC)
  • Technology & Business Solutions (TABS)
  • Automation

Latest

PaveMasters Announces Majority Investment from THL Partners
Press Release
PaveMasters Announces Majority Investment from THL Partners 

Northern Lakes Capital Exits Following a Successful Founding Partnership SAN DIEGO, Calif., August 3, 2026 – PaveMasters, a leading provider of pavement maintenance services across the Western United States, today announced a majority investment from THL Partners (“THL”), a premier private equity firm investing in middle market growth companies. Existing investor Northern Lakes Capital (“NLC”) has
Why We Invested in Celerion: Advancing the Future of Clinical Pharmacology
Insights
Why We Invested in Celerion: Advancing the Future of Clinical Pharmacology 

Key Takeaways: In April 2026, THL announced a majority investment in Celerion, a global leader in clinical pharmacology and bioanalytical sciences that supports pharmaceutical and biotechnology companies in advancing new therapies through critical stages of clinical development. As drug development becomes increasingly complex — driven by novel therapeutic modalities, precision medicine, and evolving regulatory requirements — clinical

Healthcare (HC)
THL Partners Raises $6.35 Billion of Investable Capital for Fund X
Press Release
THL Partners Raises $6.35 Billion of Investable Capital for Fund X 

Fundraising success reflects continued confidence in THL’s differentiated investment strategy BOSTON–(BUSINESS WIRE)–THL Partners, a premier private equity firm investing in middle-market growth companies, today announced the final close of THL Equity Fund X, L.P. (“Fund X”) with $6.35 billion in investable capital. Fund X received strong support from a diverse group of both existing and new investors, including
Celerion Announces Majority Investment from THL Partners
Press Release
Celerion Announces Majority Investment from THL Partners 

Strategic Partnership to Advance Clinical Pharmacology and Bioanalytical Innovation to Accelerate Drug Development LINCOLN, Neb. — [March 22, 2026] — Celerion, a global leader in clinical pharmacology and bioanalytical sciences, today announced a majority investment from THL Partners (“THL”), a premier private equity firm investing in middle market growth companies. The investment will support Celerion’s continued
Thomas H. Lee Partners Appoints Healthcare and Employee Benefits Industry Leader Dave Guilmette as Executive Partner
Press Release
Thomas H. Lee Partners Appoints Healthcare and Employee Benefits Industry Leader Dave Guilmette as Executive Partner 

Industry veteran brings over 40 years of global leadership experience to support insurance investment strategy BOSTON–(BUSINESS WIRE)–THL Partners (“THL”), a premier private equity firm investing in middle-market growth companies, today announced that Dave Guilmette has joined the firm as an Executive Partner in its Financial Technology & Services investment group. Guilmette brings over 40 years of
PaveMasters Announces Majority Investment from THL Partners
Press Release
PaveMasters Announces Majority Investment from THL Partners 

Northern Lakes Capital Exits Following a Successful Founding Partnership SAN DIEGO, Calif., August 3, 2026 – PaveMasters, a leading provider of pavement maintenance services across the Western United States, today announced a majority investment from THL Partners (“THL”), a premier private equity firm investing in middle market growth companies. Existing investor Northern Lakes Capital (“NLC”) has
Thomas H. Lee Partners Appoints Healthcare and Employee Benefits Industry Leader Dave Guilmette as Executive Partner
Press Release
Thomas H. Lee Partners Appoints Healthcare and Employee Benefits Industry Leader Dave Guilmette as Executive Partner 

Industry veteran brings over 40 years of global leadership experience to support insurance investment strategy BOSTON–(BUSINESS WIRE)–THL Partners (“THL”), a premier private equity firm investing in middle-market growth companies, today announced that Dave Guilmette has joined the firm as an Executive Partner in its Financial Technology & Services investment group. Guilmette brings over 40 years of
Navigating Uncertainty, Unlocking Growth: Why Middle Market Companies Need a Strategic Capital Markets Approach
Insights
Navigating Uncertainty, Unlocking Growth: Why Middle Market Companies Need a Strategic Capital Markets Approach 

THL in Action In today’s uncertain macroeconomic environment, middle market companies face a complex financial puzzle: how to achieve growth while managing higher interest costs, preserving flexibility, mitigating risk, and navigating dynamic and rapidly evolving credit markets. For businesses looking to invest in new products, expand into adjacent markets, build and upscale critical IT infrastructure, or

Automation
Building a Market Leader in Healthcare IT and Payments: THL in Action
Insights
Building a Market Leader in Healthcare IT and Payments: THL in Action 

In an increasingly complex healthcare environment, specialty medical practices need tools that simplify operations, improve patient care, and enable growth. That’s where Nextech—a leading healthcare technology platform—comes in. With end-to-end software tailored for ophthalmology, dermatology, and plastic surgery practices, Nextech helps clinicians manage everything from medical records and scheduling, to billing and payments. When THL invested

Financial Technology & Services (FTS)
AI-Powered Productivity Gains in Firmware, Insurtech and Beyond: Q1’25 Roundtable
Insights
AI-Powered Productivity Gains in Firmware, Insurtech and Beyond: Q1’25 Roundtable 

AI-Powered Productivity Gains in Firmware, Insurtech and Beyond Insights from THL’s Quarterly AI Roundtable Key Takeaways: To help our partner companies evaluate the business use cases for, and accelerate real-world adoption of AI, THL hosts quarterly roundtables for the CTOs, CIOs, and tech leaders across its portfolio to share wins, challenges, lessons learned, and advice. During the Q1 2025

Automation
YA Group Announces a Majority Investment from THL Partners
Press Release
YA Group Announces a Majority Investment from THL Partners 

Partnership will support continued investments to drive organic growth and strategic acquisitions Nashville, TN, August TK, 2024/ YA GROUP (“YA,” or “the Company”), an international professional services organization providing forensic consulting, engineering, risk mitigation, and related services, today announced that it will receive a majority investment from THL Partners (“THL”), a premier private equity firm investing in
Regulatory Technology and Modern Banking: A 2024 Outlook
Insights
Regulatory Technology and Modern Banking: A 2024 Outlook 

Navigating Compliance, Fraud, and Risk in a Digitally Driven Financial Landscape Key Takeaways: Financial institutions (FIs) continue to face record levels of fraud and financial loss, escalating compliance costs, and a challenging regulatory environment. To effectively combat these growing risk and regulatory burdens, FIs have access to an array of Regulatory Technology solutions to streamline compliance efforts and

Financial Technology & Services (FTS)
Why We Invested in Celerion: Advancing the Future of Clinical Pharmacology
Insights
Why We Invested in Celerion: Advancing the Future of Clinical Pharmacology 

Key Takeaways: In April 2026, THL announced a majority investment in Celerion, a global leader in clinical pharmacology and bioanalytical sciences that supports pharmaceutical and biotechnology companies in advancing new therapies through critical stages of clinical development. As drug development becomes increasingly complex — driven by novel therapeutic modalities, precision medicine, and evolving regulatory requirements — clinical

Healthcare (HC)
Celerion Announces Majority Investment from THL Partners
Press Release
Celerion Announces Majority Investment from THL Partners 

Strategic Partnership to Advance Clinical Pharmacology and Bioanalytical Innovation to Accelerate Drug Development LINCOLN, Neb. — [March 22, 2026] — Celerion, a global leader in clinical pharmacology and bioanalytical sciences, today announced a majority investment from THL Partners (“THL”), a premier private equity firm investing in middle market growth companies. The investment will support Celerion’s continued
THL Announces Agreement to Acquire Headlands Research from KKR
Press Release
THL Announces Agreement to Acquire Headlands Research from KKR 

Strategic Partnership to Advance Site Network Expansion and Accelerate Clinical Trial Innovation LAKE WORTH, Fla. & NEW YORK–(BUSINESS WIRE)–THL Partners (“THL”), a premier private equity firm investing in middle market growth companies, today announced the entry into a definitive agreement to acquire Headlands Research (“Headlands” or “the Company”), a leading multinational network of clinical trial sites, from funds managed
Agentic AI at Scale
Insights
Agentic AI at Scale 

How Digital Employees Are Reinventing Operations Across THL’s Portfolio Key Takeaways: AI is evolving from reactive assistants to proactive agents—capable of planning, executing, and adapting multi-step tasks with minimal human input. At THL’s GenAI Innovation Day, portfolio companies demonstrated how agentic AI is already reshaping employee workflows regardless of technical expertise. Looking ahead, agentic AI is poised to transform

Technology & Business Solutions (TABS)
Navigating Uncertainty, Unlocking Growth: Why Middle Market Companies Need a Strategic Capital Markets Approach
Insights
Navigating Uncertainty, Unlocking Growth: Why Middle Market Companies Need a Strategic Capital Markets Approach 

THL in Action In today’s uncertain macroeconomic environment, middle market companies face a complex financial puzzle: how to achieve growth while managing higher interest costs, preserving flexibility, mitigating risk, and navigating dynamic and rapidly evolving credit markets. For businesses looking to invest in new products, expand into adjacent markets, build and upscale critical IT infrastructure, or

Automation
AI-Powered Productivity Gains in Firmware, Insurtech and Beyond: Q1’25 Roundtable
Insights
AI-Powered Productivity Gains in Firmware, Insurtech and Beyond: Q1’25 Roundtable 

AI-Powered Productivity Gains in Firmware, Insurtech and Beyond Insights from THL’s Quarterly AI Roundtable Key Takeaways: To help our partner companies evaluate the business use cases for, and accelerate real-world adoption of AI, THL hosts quarterly roundtables for the CTOs, CIOs, and tech leaders across its portfolio to share wins, challenges, lessons learned, and advice. During the Q1 2025

Automation
Efficient Growth: How Bynder Is Partnering with THL to Extend its Market Leadership
Insights
Efficient Growth: How Bynder Is Partnering with THL to Extend its Market Leadership 

In the competitive realm of growth-stage software companies, continuing to drive strong revenue growth while creating a sustainably profitable business is often both a key challenge and opportunity. How does an innovative software company sustain the important investments in product, engineering, and go-to-market that have been so critical to its success, while also starting to

Technology & Business Solutions (TABS)
AMI Announces Majority Investment from THL Partners
Press Release
AMI Announces Majority Investment from THL Partners 

Strategic Investment Will Strengthen AMI’s Role as Key Advanced Computing and AI Infrastructure Provider  ATLANTA, GEORGIA, September 9, 2024/ AMI ( “the Company”), the global leader in Dynamic Firmware, today announced that it will receive a majority investment from THL Partners (“THL”), a premier private equity firm investing in middle market growth companies. AMI provides leading technology companies
AI-Powered Productivity Gains in Firmware, Insurtech and Beyond: Q1’25 Roundtable
Insights
AI-Powered Productivity Gains in Firmware, Insurtech and Beyond: Q1’25 Roundtable 

AI-Powered Productivity Gains in Firmware, Insurtech and Beyond Insights from THL’s Quarterly AI Roundtable Key Takeaways: To help our partner companies evaluate the business use cases for, and accelerate real-world adoption of AI, THL hosts quarterly roundtables for the CTOs, CIOs, and tech leaders across its portfolio to share wins, challenges, lessons learned, and advice. During the Q1 2025

Automation
Efficient Growth: How Bynder Is Partnering with THL to Extend its Market Leadership
Insights
Efficient Growth: How Bynder Is Partnering with THL to Extend its Market Leadership 

In the competitive realm of growth-stage software companies, continuing to drive strong revenue growth while creating a sustainably profitable business is often both a key challenge and opportunity. How does an innovative software company sustain the important investments in product, engineering, and go-to-market that have been so critical to its success, while also starting to

Technology & Business Solutions (TABS)

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