Is Filtronic a good investment in 2026?

It depends on which kind of investor you are. For a patient growth investor with the stomach for 75% annualised volatility, the case is strong: net cash, software-like margins, a record order book and around 90% of FY2027 consensus revenue already covered. For income investors, no, the yield is effectively zero. For value investors, no, the shares trade at over 60x forward earnings with the valuation factor scored 18 out of 100. Same stock, four different answers.

Why is the valuation factor only 18 out of 100 if Filtronic is so profitable?

Profitability and valuation are separate questions. Filtronic earns a 61.2% gross margin and 24.9% net margin, which is why the profitability factor scores 89. But the share price has run faster than those earnings, leaving forward P/E at 60.6x, EV/Sales at 36.9x and the PEG at 3.09. The valuation factor measures price relative to fundamentals, not the quality of the fundamentals themselves. A great business at the wrong price scores poorly here, by design.

Does the SpaceX concentration make Filtronic too risky?

It is the single biggest swing factor. One customer is estimated to drive the large majority of FY2026 and FY2027 revenue. If the Starlink E-band programme is paused, repriced or moved in-house, the growth thesis breaks at once. The mitigants the page surfaces are that around 90% of next year's revenue is already in the order book, the relationship is multi-year, and Filtronic has signed a five-year supply agreement. Treat customer diversification progress as a key thing to watch on the 4 August results.

Should I hold Filtronic in an ISA or a SIPP?

Both wrappers permit AIM shares. In an ISA, future gains and any dividends are sheltered from tax, useful for a stock you expect to hold through volatility. In a SIPP you get tax relief on contributions, but with annualised volatility above 75% the swings matter more if you are close to drawdown. AIM business-relief inheritance-tax rules tightened from April 2026 so check current status before relying on that. The wrapper choice follows your tax position and time horizon, not the stock.

How big a position is sensible given the volatility?

This is a position-sizing question rather than a buy or sell call. Annualised volatility of 75.5% and a maximum drawdown of 51% mean the stock can halve and recover within a year on its own news. For a diversified retail portfolio, that argues for sizing this as a satellite holding rather than a core position. Size it for the drawdown you can live with, not the price target you hope for.

How does Openbook calculate the Reward and Risk Scores?

The Reward Score blends Growth, Momentum, Profitability and Valuation, each scored out of 100 and weighted, with Growth carrying the most weight for Filtronic. The Risk Score blends Financial Solvency, Operational Quality, Volatility and Size, where a higher score means more risk and Volatility carries the heaviest weight at 45%. Both are built from published financials and market data, then normalised to a 0 to 100 range. Filtronic scores 76 reward and 45 risk, a strong but volatile profile.

Is Filtronic (FTC) a Good Investment? 2026 Verdict

Educational content only. This article is for educational and informational purposes only. It does not constitute financial advice or a recommendation to buy, sell, or hold any security. Investing involves risk — you may get back less than you invest. If you are unsure whether an investment is right for you, please consult a qualified financial adviser who is authorised by the Financial Conduct Authority (FCA).

At a glance

Field	Value
Ticker	FTC
Exchange	AIM (FTSE AIM 100)
Sector	Technology
Industry	RF Hardware & Electronic Components
Reward Score	76 / 100 (High — Top 10%)
Risk Score	45 / 100 (Moderate)
Forward P/E	60.6x
PEG Ratio	3.09x
1-Year Return vs FTSE 100	+47.2%
Next Catalyst	FY2026 full year results, 4 August 2026

The Investment Thesis

Is Filtronic a good investment? The honest answer is that it is a good business, which is not the same thing. Openbook's model scores Filtronic 76 for reward, placing it in the top 10% of stocks, with a net cash balance sheet, software-like margins and a record order book behind it. Yet the same model marks valuation at 18 out of 100, the shares change hands above 60 times forward earnings, and the price has just round-tripped from near 480p to the low 200s and back. So whether Filtronic is a good investment depends less on the company and more on which kind of investor you are, and the price you are willing to pay for quality.

What Filtronic does

Filtronic designs and manufactures high-frequency radio frequency hardware: E-band, V-band and W-band solid-state power amplifiers, transceivers and filters. Its customers sit in space, aerospace, defence and telecoms infrastructure, markets where performance and reliability matter more than price. The Sedgefield group has pivoted hard into space and defence, anchored by a deepening partnership with SpaceX supplying E-band amplifiers for the Starlink constellation. A UK investor would care because this is a genuine domestic technology exporter selling into structurally growing end markets, not a commodity manufacturer.

Reward Score, the read

Growth carries the heaviest weight at 40% and scores 78. The historical record is exceptional: a three-year revenue CAGR of 48.9% and net income growth of 112.3%. The catch is forward-looking. The model flags estimated revenue growth of minus 25%, because FY2025 included peak delivery on space programmes that does not repeat, and analyst price target upside of minus 6.8%. The growth you are buying is mostly in the rear-view mirror, with the coming year a deliberate pause.

Momentum scores a perfect 100, weighted 25%, and it is what lifted the headline score. The shares are 47.2% ahead of the FTSE 100 over twelve months, 43.5% over six and 33.7% over three. But momentum rewards a stock for having gone up. After a fall of more than 50% and a sharp bounce inside a few weeks, a score of 100 describes a violent ride, not a steady trend. Read it as a flag, not a reason to buy.

Profitability is the durable strength at 89, weighted 20%. Gross margin is 61.2%, net margin 24.9%, return on equity 31.6% and three-year operating profit growth 87.1%. These are unusually high margins for a hardware business and the clearest evidence that Filtronic has real pricing power in its niche. If there is one reason to own this stock, it is here.

Valuation is the drag at 18, weighted 15%. The forward P/E is 60.6x, EV/Sales 36.9x, price to cash flow 51.3x and the PEG 3.09, every multiple a material premium to peers. The lone positive is the net cash balance sheet. With margins guided to step down this year as the business invests, a PEG above 3 means you pay more than three pounds of price for each pound of expected growth. This is the factor that decides the answer for a value-minded buyer.

Risk Score, the read

The risk score of 45 is moderate, and the page is direct about why it sits there: the rating is elevated to reflect high price volatility, because a strong balance sheet does not offset large swings. On the fundamentals, Filtronic is one of the safest small caps on the market. Financial solvency scores just 4 out of 100 for risk, with interest coverage of 51x, net cash, a current ratio of 2.95x and free cash flow at 219% of debt. Operational quality scores a low 24, though margin stability is flagged as unstable at plus or minus 18.8 points, a fair read of lumpy contract revenue.

Volatility is the factor that matters, and it carries 45% of the risk weight. Annualised volatility of 75.5% is rated extreme and the maximum drawdown of 51% is rated very high. Beta, at 0.55, is called defensive, which tells you the swings are idiosyncratic, driven by SpaceX and order news rather than the wider market. Add a micro-cap size factor, and the message for a retail investor is about position sizing. This is a stock that can halve on its own news.

What the market is missing

The question of whether Filtronic is a good investment has no single answer, because the data points four different ways for four different investors:

The growth investor with a long horizon and the stomach for volatility: this is the strongest case. Structural space demand, around 90% of FY2027 consensus revenue already covered by the order book, and a new facility built for more than £200m of capacity.
The income investor: no. The yield is effectively zero and the dividend has been cut hard.
The value investor: no. At 60 times forward earnings with the valuation factor at 18, the price already assumes years of compounding.
The cautious investor near drawdown: no. Volatility above 75% and a recent 51% fall make sizing the whole game.

The underweighted fact sits in the 23 June update: roughly 90% of next year's consensus revenue is already locked in the order book, backed by multi-year SpaceX orders. The crowd calling this a dead momentum trade after the crash is ignoring a visible floor under FY2027.

The analytical view

For Openbook's core audience, cautious, income-aware and UK based, Filtronic is a watch, not a buy, at today's price. The question is not whether it is a good company, it clearly is, but whether this is a good entry, and on a 60x multiple after a double-digit bounce, it is not. The catalyst is the FY2026 results on 4 August. Watch full-year EBITDA against the £11.1m the company guided, and the FY2027 order-book commentary that has to carry the SpaceX ramp. Buy the business when the price offers a margin of safety, not when momentum has just turned. Add it to the watchlist and set a reminder for results day.