Profits were hit by investments in people, facilities, and product development, which should strengthen the foundations for future growth, the business said. Despite lower profitability, cash generation improved slightly, with operating cash flow improving to £3.4million from £2.1million. Filtronic, which was set up in 1977, specialises in the design and manufacture of what it calls 'mission-critical' communication networks for the aerospace, defence, telecoms infrastructure and low earth orbit space markets. It has two manufacturing sites in County Durham and the US, as well as three engineering centres in the UK. In August 2025, Filtronic secured its largest ever contract with Elon Musk’s SpaceX, worth £47.3million. The deal will see it supply its next-generation gallium nitride E-band technology, which is a type of radio frequency tech designed for high-performance wireless communication. The deal unveiled last August saw Filtronic further cement its role in SpaceX’s Starlink programme, with having the firm first striking up a strategic partnership and commercial agreement with SpaceX in April 2024.