Keyhaven Capital Partners backs Sullivan Street Partners’ acquisition of Zenix Aerospace

• Zenix Aerospace is a leading supplier of structural airframe and engine components with a global footprint across eight strategic locations in the US, UK, and Southeast Asia.
• This investment will support the next phase of Zenix Aerospace’s growth by scaling production in line with anticipated Original Equipment Manufacturer “OEM” build rates, leveraging well-invested production facilities and streamlining its organisational structure.
• Keyhaven Capital Partners (“Keyhaven”) sourced this transaction through its longstanding relationship with Sullivan Street Partners, a leading independent sponsor in the UK.

Keyhaven, the specialist private equity firm dedicated to the European lower mid-market, backs Sullivan Street Partners in the carve‑out and acquisition of Senior plc’s aerostructures division. Since signing the transaction in July 2025, the business has been successfully rebranded as Zenix Aerospace and established as an independent operator.  

Zenix Aerospace is a leading manufacturer of aerostructures and engine components, serving commercial aerospace and space sectors globally. The company comprises seven businesses, formerly owned by Senior plc, including AMT, Damar, Jet Products and Ketema in the United States, Weston in the UK, UPECA in Malaysia and the group’s Thailand operation.

Zenix Aerospace provides comprehensive services to blue-chip OEMs and Tier I customers, enabling effective control over quality, cost and lead times. Its global production footprint spans 1.5 million square feet, with well-established manufacturing sites across the UK and USA, supported by strategic manufacturing locations in Malaysia and Thailand.

Building on the strong heritage of its business units, Zenix Aerospace will bring its global site network into closer alignment to deliver best‑in‑class outcomes for customers and supply chain partners.

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About Keyhaven Capital Partners

Keyhaven is a specialist private equity firm dedicated to the European lower mid-market, focused on co-underwriting transactions with local sponsors. With a diverse team, a network embedded in local markets and a flexible approach to deal making, Keyhaven works with niche industry leaders to accelerate growth, building robust, sustainable businesses that deliver for their investors, employees and local communities.

Since its foundation in 2003, Keyhaven has invested or advised on investments worth in excess of €2.3 billion, representing over 70 transactions across Europe.  

About Sullivan Street Partners

Sullivan Street is a London-based buyout firm that focuses on complex situations in the lower mid-market. Founded in 2010, the firm brings an operational focus to investing and asset management by playing a proactive role in the running of its portfolio companies. The firm has built a strong 13-year track record of delivering outsized returns and successfully scaling business. As a supportive investor we stand by our ethos of ‘good business’ by effectively collaborating with management teams and leveraging our expertise to create true value. The team is headed by long-time friends and industry veterans Layton Tamberlin, Richard Sanders, and Zeina Bain. The team continue to deliver quality returns to investors and look for new deal opportunities.