White Mountains Partners (WMP), an operating company of White Mountains Insurance Group, has acquired a majority interest in BaseSix Systems LLC.
The deal, announced on April 1, gives WMP control of a low-voltage systems integrator whose work spans fire and life safety, security, connectivity and audio-visual infrastructure in commercial and institutional properties.
Founded in 2018 and headquartered in Marietta, Georgia, BaseSix provides design, installation, retrofit, maintenance, and repair of mission‑critical low‑voltage building systems for commercial and institutional customers.
John Daly, White Mountains Partners’ CEO and managing partner, said BaseSix was built with a multidisciplinary systems integration platform.
"[T]he company has achieved significant organic growth and earned an exceptional reputation for on-time, on-budget, high quality work for the most complex integration requirements. We look forward to collaborating with Basesix to help enable the company's next chapter of growth," Daly said.
White Mountains Partners positions itself as a provider of first institutional capital to the specialty consumer sectors. The BaseSix transaction follows WMP’s 2025 acquisition of Enterprise Solutions, a Nashville‑based specialty electrical contractor serving healthcare, manufacturing, education, and data center clients – another business closely tied to mission‑critical building infrastructure.
For BaseSix, the deal brings in a financial sponsor to support expansion.
"We have now reached an inflection point in Basesix's evolution where the next logical step is to join forces with a strong financial partner to pursue the significant growth opportunities ahead, including opening new offices and strategic acquisitions. We sought a capital partner who shared our core principles, unwavering culture, and strategic vision," said Robb Borden, co-founder and CEO of BaseSix. "We are excited to partner with WMP to build upon our proven model of success."
Morgan, Lewis & Bockius LLP acted as legal counsel to WMP. Deloitte Corporate Finance LLC acted as financial advisor and Miller & Martin PLLC acted as legal counsel to BaseSix.
In 2025, White Mountains reported a sharp earnings rebound, driven in part by performance from its operating companies and capital recycling – including the sale of managing general agent Bamboo to CVC Capital Partners for $848 million in net cash proceeds, while retaining a minority equity stake. The group has also taken a majority stake in MGA platform Distinguished Programs and invested in US brokerage BroadStreet Partners and other specialty intermediaries.
WMP sits within this broader strategy as a vehicle to acquire and scale essential‑services platforms that, while not insurance carriers themselves, operate in sectors closely linked to risk quality, resilience, and the broader property and casualty ecosystem.
The BaseSix acquisition highlights growing investor interest in businesses that sit upstream of insured loss experience.
Low‑voltage integrators working on fire and life safety, access control, and critical communications are central to how buildings comply with codes and manage events such as fires, intrusions, or system outages. Their work feeds directly into underwriters’ views of fire protection, security controls, and business interruption exposure on complex schedules and institutional portfolios.
White Mountains’ backing could accelerate BaseSix’s expansion into new geographies and industry verticals. Borden has flagged plans for new offices and strategic acquisitions, which may see the platform deepen its presence in sectors such as healthcare, education, data centers, and other occupancies where technology complexity and loss severity potential are high. That, in turn, may create opportunities for closer collaboration with insurers on risk engineering, preferred vendor networks, and coordinated loss‑prevention programs.
