Thompson Street Capital Partners and Onward Capital have sold Domaille to ADDMAN Engineering, a portfolio company of American Industrial Partners


Headquartered in Rochester, Minnesota, Domaille is a leading manufacturer of mission critical aerospace and defense (A&D) components and proprietary fiber optic instruments.

The Deal

Lincoln leveraged strong expertise in A&D machining, industrial technology and extensive network of relationships to secure an optimal outcome for the shareholders and find the right partner for Domaille. Domaille brings ADDMAN Engineering long-term relationships with blue-chip A&D customers, exceptional engineering talent and geographic reach. This transaction will firmly establish ADDMAN as an end-to-end solutions provider that is capable of supporting the mission critical, additive manufacturing, traditional machining and post-processing needs of demanding customers.

Our Perspective

Metallic components remains one of the highest volume subsectors within A&D mergers and acquisitions. The buyer universe is dynamic and ADDMAN is a prominent example. Domaille’s high-end machining and multi-industry focus was a great fit for ADDMAN’s vertically integrated, concept to production strategy.

ADDMAN Engineering

Founded in 2020, ADDMAN is a vertically integrated provider whose capabilities span the design, manufacturing, machining, post-processing, and quality processes needed to take any part from concept to production. From space applications to IndyCar racing teams, medical device manufacturers to robotic integrators, ADDMAN provides customers with value-driven engineered solutions enabling exceptional speed and value through the product life cycle, using radically innovative adaption of additive manufacturing technologies. For more information on ADDMAN, visit

American Industrial Partners

American Industrial Partners (AIP) is an operationally oriented private equity firm that makes control investments in industrial businesses serving domestic and global markets. The firm has deep roots in the industrial economy and has been active in private equity investing since 1989. To date, AIP has completed over 100 transactions and currently has more than $7 billion of assets under management on behalf of leading pension, endowment and financial institutions. For more information on AIP, visit

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