Ranking of the top 10 Transaction Services firms in the UK in 2026: Big 4, accountancy challengers and M&A boutiques. Headcounts, deal flow, junior salaries and profiles recruited.
The UK is the densest Transaction Services market in Europe, with over a hundred active firms and three of the world's deepest deal centres (London, Manchester, Birmingham). This post reviews the 10 most active TS firms in the UK in 2026: TS headcount in London, deal flow, recruited profiles and entry-level compensation. The ranking criterion: number of mid-market and large-cap deals delivered over the last 12 months, cross-checked with team size.
Deloitte UK is the largest Transaction Services practice in the country, with ~600 TS professionals across the UK, the majority in London. Strongest broad-coverage capability — large cap (£1bn+), mid market (£100m-£1bn), small cap — and a leading position in TMT, consumer and industrials.
EY merged Parthenon into its existing transaction practice in 2021. UK TS is ~550 professionals. Particularly strong in private equity portfolio work and in cross-border deals.
KPMG's Deal Advisory practice combines TS, M&A advisory and restructuring. UK TS team is ~500 professionals. Differentiated by integrated cross-functional teams (TS + commercial DD + tax DD) on the same engagement.
PwC Deals UK covers Transaction Services, M&A advisory and corporate finance, with ~550 professionals in the UK. Strong in large-cap LBOs and industrial carve-outs.
BDO is the UK's most credible mid-tier challenger to the Big 4 on TS, with ~200 TS professionals across London, Manchester and Birmingham. Sweet spot is sub-£500m enterprise value deals where Big 4 fee scales are uncompetitive.
Grant Thornton is another mid-tier challenger with strong TS capability in the lower mid market. ~150 TS professionals UK-wide. Differentiates by sector-led teams (TMT, healthcare, consumer).
A&M is a US-headquartered boutique with a major London office. UK TS team is ~120 professionals, with a strong restructuring DNA carrying over to TS work — particularly active on stressed deals and turnaround situations.
AlixPartners is a US boutique with ~100 professionals in London, sitting at the intersection of TS, turnaround and operational consulting. Selective deal flow, high-value engagements.
FTI Consulting's London Corporate Finance and Restructuring practice runs a TS-equivalent function with ~100 professionals. Differentiation: forensic accounting capability integrated with TS for complex post-acquisition disputes.
The top 10 is rounded out by:
For a detailed analysis: see Big 4 vs boutique TS: which firm to choose.
UK TS interviews follow a fairly consistent format across firms:
Boutiques (A&M, AlixPartners) tend to run faster processes (2-3 rounds) with more partner exposure earlier. Big 4 graduate schemes use assessment centres for the volume of applicants.
| Grade | Big 4 base | A&M / AlixPartners base | Big 4 bonus | Boutique bonus |
|---|---|---|---|---|
| Analyst (1st year) | £42-48k | £55-62k | 6-10% | 15-25% |
| Senior Analyst | £55-65k | £65-78k | 10-15% | 20-30% |
| Manager | £80-95k | £100-120k | 15-22% | 25-35% |
| Senior Manager | £105-130k | £140-180k | 20-30% | 30-45% |
| Director | £150-200k | £200-280k | 25-40% | 40-60% |
US bank-owned firms (Houlihan Lokey, Lazard CF) sit between boutiques and pure investment banking comp.
The Transaction Services Interview Programme (€119.99, one-time) covers the technical interview content used by all these firms: QoE, working capital, net debt bridge, Excel modelling, mock interview with a Big 4 recruiter. Enrol today.
Which is the best Transaction Services firm in the UK?
Deloitte UK runs the largest TS practice (~600 professionals) with the broadest deal coverage, but "best" depends on your goal: the Big 4 (Deloitte, EY-Parthenon, KPMG, PwC) for breadth and brand, A&M and AlixPartners for higher pay and earlier partner exposure, Houlihan Lokey or Rothschild for deal-side proximity.
How much do Transaction Services analysts earn in London?
First-year analysts earn roughly £42-48k base at the Big 4 and £55-62k at boutiques such as A&M or AlixPartners, plus a 6-25% bonus depending on the firm.
Big 4 or boutique Transaction Services — which should I choose?
The Big 4 offer structured training, brand and large deal volume; boutiques (A&M, AlixPartners) pay more, run leaner teams and give earlier client and partner exposure. The Big 4 is the safer entry route; boutiques reward strong performers faster.
How do I get into Transaction Services in the UK?
Most firms recruit from Russell Group / Oxbridge backgrounds and Big 4 audit, then test you on QoE, net debt and net working capital in a technical round plus an Excel case study. The Transaction Services Interview Programme covers exactly that content.
Hundreds of candidates prepared their interviews with this programme. Those who landed the role have one thing in common: they worked the cases before walking into the room.
