Doncasters Acquires $73M Stake in GE Aerospace Joint Venture

IRVINE, Calif. – November 12, 2026 — The aerospace manufacturing sector witnessed a significant strategic realignment today as Janes Capital Partners announced the successful divestiture of SeaCast LLC's 50% ownership stake in Montana Precision Products (MPP). The equity interest was acquired by DPC Holdings PLC, operating globally as Doncasters, in a cash transaction valued at $73 million.

With the deal finalized, the UK-headquartered precision casting specialist formally steps in to replace SeaCast as the 50/50 joint venture partner alongside Unison Industries, a subsidiary of GE Aerospace. The transaction underscores a growing industry mandate to secure mission-critical manufacturing capacity amid unprecedented commercial aircraft delivery backlogs.

Operating out of a 112,000-square-foot AS9100D-certified facility in Butte, Montana, MPP is a vital node in the aerospace supply chain. The plant, which employs approximately 200 people, specializes in small structural castings, as well as complex welded tube and duct assemblies. These highly engineered components are primarily destined for GE Aerospace's commercial and defense engine platforms, making the facility's output indispensable to global aviation.

Reshuffling the Aero-Engine Supply Chain

The acquisition represents a calculated maneuver by Doncasters to deepen its integration with tier-one original equipment manufacturers. By purchasing the stake in MPP, the company not only expands its North American manufacturing footprint but also cements its relationship with GE Aerospace, preserving the engine maker's dual role as both a joint venture partner and an anchor customer.

Industry analysts note that this move is indicative of a broader supply chain strategy. "Engine manufacturers are currently facing intense sector-wide ramp-up pressures," observed one aerospace supply chain analyst familiar with the transaction. "By integrating a specialized foundry operator like Doncasters directly into the ownership structure of a critical supplier, OEMs can better insulate themselves against production bottlenecks."

For Doncasters, the $73 million investment is expected to be earnings accretive within the first year. The company intends to leverage its deep technical expertise in nickel- and cobalt-based superalloys to enhance the Butte facility's output. Strategic plans include supporting capacity growth and product expansion through long-term agreements and a committed capital investment roadmap. There are also emerging synergies, such as the potential for Doncasters to supply raw alloys from its own internal capacity directly to the Montana plant.

Strategic Capital and Boutique M&A Trends

The divestiture marks the end of a 14-year joint venture chapter for SeaCast, a privately held Seattle-based company established in 1985. Operating full-service investment casting foundries across multiple sectors—including defense, oil and gas, and transportation—SeaCast's exit illustrates how privately held founders are capitalizing on robust aerospace valuations to realize liquidity events.

Janes Capital Partners, an Irvine-based boutique investment bank focused exclusively on the aerospace and defense sector, orchestrated the transaction as SeaCast's sole financial advisor. Supported by UK affiliate Oaklins S&W, the advisory firm navigated the complexities of a transatlantic mid-market aerospace deal. Stoel Rives served as legal counsel for the seller.

The liquidity fueling this acquisition stems directly from Doncasters' recent financial maneuvers. Having completed a highly successful initial public offering in June 2026, the newly public entity has been aggressively deploying its fresh capital. In its third-quarter earnings report, Doncasters posted record revenue of $308 million—a 39% year-over-year increase—and an adjusted EBITDA of $58 million, up 56%. This robust financial posture, coupled with a recent debt refinancing that established new three-year facilities, provided the necessary firepower for the cash acquisition of the MPP stake.

Local Impact and Manufacturing Growth in Montana

Beyond the corporate boardrooms, the transaction carries significant implications for the local economy in Butte, Montana. As a major regional employer, MPP's transition to new co-ownership has been closely monitored by local economic development officials.

The entry of a well-capitalized, growth-oriented partner like Doncasters is largely viewed as a stabilizing and expansive force for the 200-person workforce. While immediate workforce adjustments were not detailed in the transaction announcement, Doncasters' corporate strategy heavily emphasizes providing OEMs with committed capacity through long-term partnerships and bolt-on acquisitions.

This strategic framework suggests a high likelihood of future operational growth at the Butte facility. By committing to investment plans designed to enhance the plant's foundry capabilities and output, the new joint venture structure could lead to an expanded footprint and additional highly skilled manufacturing jobs in the region, reinforcing Montana's growing industrial manufacturing ecosystem.

The Broader Race for Aerospace Casting Capacity

The MPP transaction does not exist in a vacuum; it is a microcosm of a massive consolidation wave sweeping through the aerospace casting and forging sector. Global engine makers are scrambling to secure critical casting capacity to meet soaring demand across commercial aviation, aftermarket services, and defense sectors.

GE Aerospace, the ultimate end-user of MPP's components, has been particularly aggressive in securing its supply lines. In September 2026, the aviation giant announced an agreement to acquire Consolidated Precision Products, another major manufacturer of highly engineered castings. That acquisition, much like the restructuring of the MPP joint venture, underscores the critical importance of locking in mission-critical casting capacity.

Suppliers that can guarantee volume and quality are currently commanding a premium in the market. Doncasters has capitalized on this dynamic, recently announcing its fifth Strategic Customer Partnership—a minimum 10-year contract with a major Industrial Gas Turbine OEM that involves significant, customer-funded capacity investments. The company expects these strategic agreements to deliver over $300 million in annual incremental revenue by 2031.

As the aerospace industry continues to navigate the complexities of post-pandemic recovery and unprecedented order backlogs, the alignment of specialized manufacturers with major OEMs will remain a dominant theme. The successful transfer of the MPP stake from a private foundry operator to a publicly traded casting powerhouse highlights the ongoing maturation and consolidation of the aerospace supply chain, ensuring that the engines powering the next generation of flight have the reliable components they require.