Cook Defence Systems will continue to operate out of its Stanhope factory
The North East operations of historic steel business William Cook have been acquired by US defence giant Heico in an undisclosed deal.
The move sees the formation of a new company Heico-Cook Defence which will encompass Cook Defence Systems, William Cook Stanhope and William Cook Intermodal. The joint venture is 80% owned by Heico and 20% by William Cook Holdings.
Cook Defence Systems – which has played a key role in providing replacement tracks for Ukraine’s tank fleet – and its sister companies will continue to operate from their purpose-built factory in Stanhope, which employs about 130 people. The two firms have said contracts with employees, customers and supplies remain unaffected.
Meanwhile, William Cook Rail, William Cook Cast Products and their subsidiaries and associates remain wholly owned by William Cook Holdings, which reported turnover of £100m for the year to June 28, 2025. Cook Defence Systems also makes blast-proof components for armoured vehicles and was created in its current form in 1994 by Sir Andrew Cook, who has helped it become a long-standing supplier to national ministries of defence.
Sir Andrew said: “We are proud to have built Cook Defence Systems into a trusted partner to governments, armies and armoured vehicle manufacturers worldwide. In Heico, we have found a long-term partner that values our independence, supports our growth ambitions, and shares our commitment to engineering excellence, quality, and service.
“We are confident about the future of Cook Defence Systems under the joint ownership of Heico and William Cook Holdings.”
Hollywood-based Heico makes parts of large commercial and military aircraft as well as industrial turbines, targeting systems, missiles and electro-optical devices. It reported net sales of more than $4.4bn (£3.2bn) in the year to the end of October, 2025.
Eric Mendelson Heico’s co-chairman and co-chief executive officer, said: “Cook Defence Systems represents a distinctive addition to Heico, with many of the attractive attributes we look for in our businesses. The company has established strong relationships across leading defence OEMs and government customers across multiple critical armoured vehicle platforms.
“Cook’s proprietary technology, consistent aftermarket demand, and exposure to increasing global defence spending position it well for continued growth and long-term value creation. We are pleased to welcome William Cook and his team to the Heico family.”
Last year, Cook Defence Systems hosted the Minister for Armed Forces Luke Pollard as the firm celebrated a three-year contract to supply spare tracks for all of the Army’s in-service armoured fighting vehicles. The firm is also supplying tracks for the Army’s Challenger 3 tanks and Ajax vehicles.
Sir Andrew Cook CBE remains chairman of William Cook Holdings and William Cook and Chris Seymour continue as directors.








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