MMA's Big Sky Play: Seitz Acquisition Cements Montana Presence

WHITE PLAINS, NY – April 07, 2026 – Marsh McLennan Agency (MMA), a subsidiary of the global professional services giant Marsh, has announced its acquisition of Seitz Insurance Agency, a well-established independent agency headquartered in Sidney, Montana. While the financial terms of the deal were not disclosed, the strategic implications are clear: MMA is cementing a comprehensive, statewide presence in Montana, pushing eastward to capture critical and specialized markets.

The move brings Seitz Insurance, including its 24 employees and principals David Seitz and Camila Skinner, into the fold of MMA's expansive Northwest region. This acquisition not only fills a geographic gap in MMA's Montana operations but also integrates deep, localized expertise in the state's vital agriculture, crop, and energy industries.

A Strategic Consolidation in the Big Sky State

This acquisition is the latest move in a deliberate and strategic expansion by MMA in the American Northwest. The foundation for this regional powerhouse was significantly fortified in 2021 with the landmark acquisition of PayneWest Insurance, one of the largest independent agencies in the region. That deal established MMA's Northwest hub, headquartered in Missoula, Montana, and instantly created a dominant presence across Montana, Idaho, Washington, and Oregon.

Since then, MMA has operated nine offices across central and western Montana, including locations in major hubs like Billings, Bozeman, Missoula, and Helena. However, the eastern side of the vast state remained a strategic frontier. The acquisition of Sidney-based Seitz Insurance, along with its office in Polson that resulted from a 2023 acquisition of its own, decisively closes that gap.

Sarah Walsh, CEO of MMA’s Northwest region, framed the acquisition as the final piece of a larger puzzle. “Seitz Insurance is an agency we’ve admired for years,” she stated. “With nine other MMA offices throughout central and western Montana, the Seitz Insurance team helps us round out more of our services on the eastern side of the state.” This move transforms MMA from a firm with a strong Montana presence to one with a complete, coast-to-coast footprint within the state's borders, enhancing its competitive position against other regional and national brokers.

From Local Legacy to Global Network

For the communities in eastern Montana, the deal marks a new chapter for a local institution. Founded in 1961, Seitz Insurance has been a fixture in the region for over six decades. As Walsh noted, “Many in the community have grown up with Seitz Insurance as a household name,” a testament to the agency's deep roots and trusted reputation.

Rather than being absorbed and erased, the local identity of Seitz is a core part of the acquisition's value. All employees, including principals and co-owners David Seitz and Camila Skinner, will join MMA and, crucially, will continue to operate from their existing office locations. This signals a commitment to continuity for clients who have relied on Seitz for generations. The agency itself was in a growth phase, having acquired Polson-based Bishop Insurance Services in 2023 to expand its offerings in the Flathead and Mission Valley area.

For Seitz, joining MMA provides a pathway to future-proof the agency, combining its local touch with the formidable resources of a global leader. “We chose Marsh McLennan Agency because of their commitment to clients, colleagues and communities alike,” said David Seitz. He expressed confidence that the partnership would allow the agency to maintain its legacy of service while enhancing its capabilities. “Joining MMA gives us confidence that Seitz Insurance can continue serving our clients with integrity and industry-leading solutions, while giving our colleagues room to grow and deepen the community relationships that have always defined us.”

Harvesting Risk in Specialized Markets

The strategic value of the Seitz acquisition extends beyond geography. It is a targeted acquisition of expertise. Seitz Insurance has built its reputation by specializing in the complex insurance needs of Montana’s foundational industries: agriculture, crop, and energy. These sectors are the economic lifeblood of eastern Montana and present unique risk profiles that demand specialized knowledge.

Montana's agricultural sector faces increasing volatility from climate change, fluctuating commodity prices, and evolving technology, making sophisticated crop and farm insurance more critical than ever. Likewise, the energy sector, encompassing traditional oil and gas as well as emerging renewables, navigates a complex web of operational, environmental, and regulatory risks. Acquiring a team with decades of experience in these niche markets provides MMA with immediate credibility and a significant competitive advantage.

By integrating Seitz's specialized knowledge, MMA can offer more robust and tailored risk management solutions to farmers, ranchers, and energy companies. This move reflects a broader trend in the insurance industry, where large firms are strategically acquiring smaller, specialized agencies to gain niche expertise rather than attempting to build it from the ground up. It allows MMA to deploy global resources and cutting-edge products through a trusted local team that speaks the language of its clients' industries.

This fusion of global scale and local specialization ensures that as risks evolve for Montana's key industries, the newly expanded Marsh McLennan Agency is positioned not just to compete, but to lead the market in providing comprehensive solutions.