8-K: White Mountains Completes $150 Million Strategic Investment in BroadStreet Partners

White Mountains Insurance Group, Ltd. has successfully closed its previously announced $150 million strategic investment in BroadStreet Partners, an insurance brokerage company.

Summary

• White Mountains Insurance Group, Ltd. closed its $150 million investment in BroadStreet Partners on July 18, 2025.
• The investment is part of a strategic investor group led by Ethos Capital and British Columbia Investment Management Corporation (BCI).
• Accounts advised by T. Rowe Price Investment Management, Inc. also participated in the investment.
• Ontario Teachers' Pension Plan will retain a significant co-control stake and continue its partnership with the Ethos-led investor group.
• BroadStreet Partners is a leading middle-market insurance brokerage headquartered in Columbus, Ohio, specializing in commercial and personal property & casualty and employee benefits solutions.
• The company operates a distinctive co-ownership model, partnering with 30 Core Agency Partners and supporting over 800 agency professionals across the U.S. and Canada.
• BroadStreet provides M&A capabilities, capital solutions, and resources to accelerate organic growth and focuses on innovation and digital transformation.

Sentiment

Score: 8

Explanation: The announcement details the successful closing of a significant strategic investment, involving multiple reputable institutional investors, which is a positive development for BroadStreet Partners and a strategic deployment of capital for White Mountains.

Positives

• The successful closing of a strategic investment marks a significant milestone in BroadStreet Partners' growth trajectory.
• BroadStreet's distinctive co-ownership model, commitment to innovation, and continued investment in digital transformation position its Core Agency Partners for sustained success and long-term growth.
• The investment group includes reputable institutional investors such as Ethos Capital, BCI, White Mountains, T. Rowe Price, and Ontario Teachers' Pension Plan, indicating strong confidence in BroadStreet's business model.

Future Outlook

BroadStreet Partners is positioned for sustained success and long-term growth through its distinctive co-ownership model, commitment to innovation, and continued investment in digital transformation.

Management Comments

• BroadStreet Partners announced the successful closing of a strategic investment by an investor group led by Ethos Capital, British Columbia Investment Management Corporation (BCI), and White Mountains Insurance Group, Ltd., marking a significant milestone in the Company's growth trajectory.

Industry Context

This strategic investment highlights continued consolidation and capital deployment within the middle-market insurance brokerage sector, where firms like BroadStreet Partners are leveraging M&A capabilities and digital transformation to accelerate growth and provide comprehensive solutions.

Stakeholder Impact

• Shareholders of White Mountains Insurance Group, Ltd. are impacted by the deployment of $150 million in a strategic investment.
• BroadStreet Partners and its Core Agency Partners benefit from enhanced capital solutions and resources for growth.
• Over 800 agency professionals across the U.S. and Canada associated with BroadStreet Partners gain from continued ownership opportunities and support.

Next Steps

• BroadStreet Partners will continue its partnership with the Ethos-led investor group and Ontario Teachers' Pension Plan to support its Core Agency Partners and accelerate organic growth.

Key Dates

Keywords

Insurance brokerage, Strategic investment, Private equity, Financial services, M&A, Property & casualty, Employee benefits, Middle-market