Tristel (TSTL.L) Stock Analysis & Winston Score

Tristel is a British company that makes chemical disinfectants used in hospitals and clinics. Its main product is a foam and wipe system based on chlorine dioxide, which kills harmful bacteria and viruses on medical devices — especially ultrasound probes used to examine patients. Hospitals across more than 30 countries use Tristel's products to prevent infections from spreading between patients. The company earns money by selling its consumable wipe and foam products, which hospitals need to restock regularly, creating a steady repeat-purchase revenue stream. Tristel is headquartered in the UK and generates a significant share of sales in Europe and Australia, with the United States representing a major growth opportunity that has required a lengthy FDA approval process. Its moat comes from regulatory clearances that are difficult for competitors to replicate quickly, but the key risk is that delays or setbacks in gaining full US market access could limit growth for an extended period.