 Squarepoint Capital | Quantitative hedge fund | ~ 650 people | | | | City of London | 36 |
 JPMorgan | Large global investment bank | | | £660bn | | Canary Wharf | 35 |
 G-Research | Trading firm | | | | | Soho | 34 |
 DRW | Trading firm | ~ 380 people | | | | City of London | 29 |
 Hudson River Trading | Trading firm | ~ 160 people | | | | City of London | 23 |
 Jane Street | Trading firm | ~ 800 people | | | | City of London | 23 |
 Citigroup | Large global investment bank | | | £161bn | | Canary Wharf | 22 |
 Goldman Sachs | Large global investment bank | ~ 4450 people | | £192bn | | City of London | 21 |
 Rothschild & Co | Independent advisory bank | ~ 950 people | | | 334 in 2025 | City of London | 19 |
 Morgan Stanley | Large global investment bank | | | £220bn | | Canary Wharf | 14 |
 Point72 | Hedge fund, several strategies | ~ 320 people | ~ £34bn | | | St James's | 14 |
 EY | Advisory firm | | | | 370 in 2025 | Southwark | 12 |
 Bank of America | Large global investment bank | | | £281bn | | City of London | 11 |
 Blackstone | Large private equity firm | ~ 490 people | ~ £975bn | | | Mayfair | 11 |
| BPBNP Paribas | Large global investment bank | | | £82bn | | | 11 |
 Crédit Agricole CIB | European investment bank | | | £41bn | | City of London | 11 |
 DV Trading | Trading firm | | | | | City of London | 11 |
 Maven Securities | Trading firm | | | | | City of London | 11 |
 Wintermute | Trading firm | ~ 80 people | | | | | 11 |
 Barclays | Large global investment bank | | | £57bn | | Canary Wharf | 10 |
 Citadel Securities | Trading firm | ~ 270 people | | | | City of London | 9 |
 Standard Chartered | International investment bank | | | £45bn | | | 9 |
 Interpath Advisory | Specialist advisory firm | | | | | City of London | 8 |
 Macquarie | International investment bank | | | £44bn | | City of London | 8 |
 PIMCO | Investment firm | ~ 30 people | ~ £1,747bn | | | Marylebone | 8 |
 UBS | Large global investment bank | | | £107bn | | | 8 |
 Man Group | Hedge fund, several strategies | ~ 1050 people | ~ £190bn | | | City of London | 7 |
 MUFG Securities | European investment bank | ~ 650 people | | £186bn | | | 7 |
 Nomura | International investment bank | ~ 2000 people | | £21bn | | City of London | 7 |
 Capital Group | Asset manager | ~ 18 people | ~ £2,250bn | | | | 6 |
 Citadel | Hedge fund, several strategies | ~ 650 people | ~ £50bn to £57bn | | | City of London | 6 |
 GSA Capital | Quantitative hedge fund | | ~ £2bn to £3.6bn in 2022 | | | Mayfair | 6 |
 HSBC | Large global investment bank | | | £236bn | | Canary Wharf | 6 |
 IMC Trading | Trading firm | ~ 40 people | | | | | 6 |
 PJT Partners | Independent advisory bank | ~ 300 people | | £4.1bn | 72 in 2025 | Mayfair | 6 |
 Capula Investment Management | Hedge fund, macro | ~ 12 people | ~ £22bn to £23bn | | | Mayfair | 5 |
 Dartmouth Partners | Advisory firm | | | | | City of London | 5 |
 Evercore | Independent advisory bank | ~ 430 people | | £7.6bn | | Mayfair | 5 |
 FTI Consulting | Advisory firm | ~ 1300 people | | £2.8bn | | City of London | 5 |
 Headlands Technologies | Trading firm | | | | | City of London | 5 |
 Jefferies | International investment bank | ~ 1250 people | | £7.6bn | | City of London | 5 |
 StepStone Group | Fund of funds | | ~ £174bn | | | | 5 |
 William Blair | International investment bank | | | | | City of London | 5 |
 Xantium | Trading firm | | | | | Mayfair | 5 |
 Brevan Howard | Hedge fund, macro | ~ 11 people | ~ £23bn to £26bn | | | Marylebone | 4 |
 Brooks Macdonald | Asset manager | ~ 12 people | ~ £21bn | | | | 4 |
 CPP Investments | Sovereign wealth fund | ~ 65 people | ~ £432bn | | | Marylebone | 4 |
 Deutsche Bank | Large global investment bank | ~ 6700 people | | £47bn | | City of London | 4 |
| DWDWS Group | Bank | | | £11bn | | City of London | 4 |
 Kroll | Bank | | | | | | 4 |
 Lincoln International | International investment bank | ~ 120 people | | £1.8bn | 430 in 2025 | Covent Garden | 4 |
 Moelis & Company | Independent advisory bank | | | £3.4bn | 154 in 2025 | Marylebone | 4 |
 RBC Capital Markets | International investment bank | | | £202bn | | City of London | 4 |
 Wells Fargo | International investment bank | | | £186bn | | | 4 |
 Winton | Quantitative hedge fund | ~ 160 people | ~ £6.4bn to £7.5bn in 2023 | | | Chelsea | 4 |
 Apollo Global Management | Large private equity firm | ~ 400 people | ~ £703bn | | | | 3 |
 Balyasny Asset Management | Hedge fund, several strategies | | ~ £24bn to £27bn | | | St James's | 3 |
 bp Trading & Shipping | Trading firm | | | | | Canary Wharf | 3 |
 Brookfield | Infrastructure investor | ~ 120 people | ~ £285bn | | | Canary Wharf | 3 |
 Cantor Fitzgerald | Bank | | | | | | 3 |