Filtronic’s Record Run Hits 405p as Insider Sales and Sky-High P/ E Raise Questions

The London-listed specialist in high-frequency electronics has been on a tear that few saw coming. Filtronic’s share price surged 19% on Thursday to touch a new 52-week high of 405 pence, extending its year-to-date gain to roughly 124%. The rally has been fuelled by a potent mix of Starlink hype, defence contracts and a deepening partnership with SpaceX.

Yet beneath the surface of this remarkable ascent, signals are flashing caution. Three directors, including chief financial officer Michael Tyerman, sold shares in April, offloading a combined block of more than 240,000 equities. Board members Peter Magowan and John Behrendt also trimmed their holdings. Such insider disposals after a meteoric rise are often interpreted by market watchers as a sign that management sees the current valuation as full.

And full it is. Filtronic now trades at a price-to-earnings ratio of around 109, a level that prices in years of aggressive growth. The relative strength index stands at 75.6, firmly in overbought territory and suggesting the stock is ripe for a pullback. Analysts at Berenberg have set a target of 360 pence, well below the current market price.

Should investors sell immediately? Or is it worth buying Filtronic?

The company’s fundamental story remains compelling. Filtronic supplies specialised radio-frequency hardware for satellite ground stations, and its relationship with SpaceX has been a game-changer. A major order worth $62.5 million from the Elon Musk-led group is driving revenue growth, while SpaceX also holds options on 10% of Filtronic’s equity. New US regulations permitting higher satellite transmission power are further boosting demand for the company’s kit.

Beyond the SpaceX connection, Filtronic has been winning business in the defence sector. In March, it secured an $8 million US contract, followed by a £400,000 deal for European defence applications. These wins underscore the company’s role in an increasingly tense geopolitical environment, where spending on satellite communications and electronic warfare is rising globally.

The financials back up some of the optimism. In the last financial year, revenue climbed to £56.3 million, with operating profit hitting £13.4 million. But scaling production remains a challenge. Manufacturing cycles in this niche industry can stretch to three years, and the heavy dollar exposure in the business introduces currency volatility.

For now, the market is betting that the momentum will continue. A potential SpaceX initial public offering could provide a fresh catalyst, while the defence pipeline looks robust. But with the stock trading at more than double the analysts’ fair value estimate and insiders cashing in, the question is whether the 400p level can hold. Should order flow slow, technical correction targets in the 240p to 270p range could come into play, offering a more realistic entry point for new investors.

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