Kelso adds Filtronic stake as RF specialist powers growth

Insight Business Support Plc ( (GB:KLSO) ) has issued an update.

Kelso Group Holdings Plc, a main market-listed investment company, focuses on building a tightly concentrated portfolio of under ten established, profitable UK small and mid-cap stocks with strong balance sheets. It seeks to generate superior long-term returns for shareholders, underpinned by a highly aligned board that collectively owns around 17% of the company and brings broad experience in UK capital markets.

Kelso has disclosed a new investment in Filtronic Plc, acquiring 500,000 shares between December 2025 and February 2026 in the UK-based specialist in RF, microwave and mmWave components for telecoms, aerospace, defence and space markets. The position, now worth roughly 10% of Kelso’s gross investments after a near 60% unrealised gain, reflects confidence in Filtronic’s rapid revenue growth, strengthened balance sheet and expanding high-profile contract base, reinforcing Kelso’s strategy of backing high-quality, high-barrier technology leaders.

Filtronic’s recent momentum, including major partnerships and contracts in satellite communications, defence and critical communications, has driven revenues to more than triple over three years and produced a record order book covering the majority of its current-year sales. Kelso’s move further diversifies its portfolio, which already includes stakes in names such as NCC, Saga, CVS, The Works, Selkirk, THG and Angling Direct, and positions the investor to benefit from growing global demand for advanced radio frequency solutions and the expanding space sector.

Spark’s Take on KLSO Stock

According to Spark, TipRanks’ AI Analyst, KLSO is a Neutral.

The score is weighed down primarily by the sharp deterioration in financial performance and cash generation in 2024 versus 2023, despite a relatively solid balance sheet. Technical indicators are broadly neutral with slightly weak short-term momentum, and valuation cannot be assessed due to missing P/E and dividend yield data.

To see Spark’s full report on KLSO stock, click here.

More about Insight Business Support Plc

Kelso Group Holdings Plc is a London-listed investment vehicle focused on a concentrated portfolio of fewer than ten UK-listed small and mid-cap companies. It targets established, profitable market leaders with strong balance sheets, avoiding early-stage, speculative, highly cyclical and resources businesses. The board, which owns about 17% of Kelso, brings extensive experience across fund management, private equity, corporate finance, law and M&A advisory.

Kelso is backed by more than 75 primarily known investors alongside a small number of institutions, and aims to deliver market-leading compounded returns with moderate net gearing. Its current portfolio spans a mix of growth, recovery, deep value and special situations, with investee company market capitalisations averaging around £400 million across both FTSE 250 and AIM listings.

Average Trading Volume: 625,839

Technical Sentiment Signal: Buy

Current Market Cap: £13.94M

See more data about KLSO stock on TipRanks’ Stock Analysis page.