This Practice Note looks at market trends in IPOs and secondary offers which completed on the Main Market of the London Stock Exchange and AIM in 2025. For general information on IPOs and secondary offers, see Practice Notes: IPOs—fundamentals and Undertaking a secondary offer—fundamentals. IPOs IPO activity increased in 2025, with 23 IPOs across the Main Market and AIM, up from 17 in 2024 although volumes remained subdued by historical standards. Main Market IPOs Main Market IPO volumes rose modestly to nine IPOs, compared with seven in 2024. Aggregate market capitalisation of companies completing an IPO increased significantly, driven by a small number of larger transactions, most notably the dual listing of Fermi Inc., the largest IPO of the year by value (£14.5bn). Gross proceeds raised also rebounded from 2024 levels. As in recent years, Main Market listings were significantly boosted by companies joining by way of introduction or transfer from AIM. 2025 saw a notable number of sizeable introductions, including International Paper which listed with an opening market capitalisation of over £22bn. There was a marked