PKF Littlejohn takes top spot in latest AIM auditors rankings
PKF Littlejohn has claimed the top spot in the latest AIM Advisers Rankings Guide, overtaking BDO for the first time since Q1 2017. The firm now leads by the total number of AIM-listed clients, with 85 clients compared to BDO’s 84.
Despite this shift in client numbers, BDO continues to hold the top position in terms of total client market cap, which stands at £11.39 billion.
The latest rankings, which include data from April 2025, show several shifts in the advisory landscape for AIM-listed clients. PKF Littlejohn’s rise marks a significant change in the standings, although BDO’s lead by market cap remains strong.
Meanwhile, other firms, including HaysMac, have shown notable improvements, with HaysMac moving up to 7th place after gaining three new clients in the last quarter.
In the FTSE AIM 100, BDO now leads PwC by the number of top-tier AIM clients, while PwC remains ahead by client market cap.
Grant Thornton also made strides, securing two new clients, pushing it into 3rd place in the FTSE AIM UK 50 rankings, where it now competes closely with Deloitte.
In terms of sector-specific rankings, PKF Littlejohn continues to dominate in the Basic Materials and Energy sectors, with Crowe making significant strides in the Technology sector.
The full list of the top AIM auditors based on client numbers is as follows:
- PKF Littlejohn: 85 clients
- BDO: 84 clients
- Crowe: 63 clients
- Grant Thornton UK: 47 clients
- RSM UK Audit: 42 clients
- PwC: 37 clients
- HaysMac: 27 clients
- Deloitte: 23 clients
Additionally, several smaller firms are making a strong showing, with S&W and MHA improving their rankings, reflecting the growing diversity in the advisory market for AIM-listed companies.
The rankings also highlight sectoral growth, with PKF Littlejohn leading in Basic Materials, Energy, and Financials & Real Estate. Crowe has overtaken competitors in the Technology sector, while Deloitte and BDO continue to lead in Consumer Discretionary & Staples.
