3 UK Penny Stocks With Market Caps Over £100M To Consider

Wed, October 1, 2025 at 3:05 AM EDT 4 min read

The United Kingdom’s stock market has recently faced challenges, with the FTSE 100 index experiencing declines due to weaker trade data from China, reflecting broader global economic concerns. Despite these headwinds, investors continue to seek opportunities in smaller or newer companies that may offer untapped value. Penny stocks, though an older term, remain a relevant investment area for those looking to capitalize on companies with solid financial foundations and potential for growth.

Click here to see the full list of 302 stocks from our UK Penny Stocks screener.

Let’s explore several standout options from the results in the screener.

Simply Wall St Financial Health Rating: ★★★★★☆

Overview: Diaceutics PLC is a diagnostic commercialization company that offers data, data analytics, and implementation services to pharma and biotech companies, with a market cap of £140.48 million.

Operations: The company’s revenue is derived entirely from its Medical Labs & Research segment, totaling £34.40 million.

Market Cap: £140.48M

Diaceutics PLC, with a market cap of £140.48 million, remains a compelling prospect in the penny stock arena due to its strategic focus on precision medicine commercialization. Despite being unprofitable and experiencing increased losses over the past five years, the company reported H1 2025 sales of £14.56 million, indicating growth from the previous year. Diaceutics is debt-free and maintains sufficient cash runway for over a year based on current free cash flow levels. Recent expansion of its PMx commercialization partnership underscores its potential for incremental service revenue and strengthens its role in precision medicine solutions.

• Click here to discover the nuances of Diaceutics with our detailed analytical financial health report.

• Examine Diaceutics’ earnings growth report to understand how analysts expect it to perform.

Simply Wall St Financial Health Rating: ★★★★★★

Overview: Castings P.L.C. is involved in iron casting and machining operations across various international markets, with a market cap of £113.86 million.