| Alumasc Group plc | ALU | £2.74 | £99mn |  | 
| Amedeo Air Four Plus Ltd | AA4 | £0.64 | £222mn |  | 
| Andrews Sykes Group plc | ASY | £5.10 | £213mn |  | 
| Anexo Group Plc | ANX | £0.33 | £32mn |  | 
| Angle | AGL | £0.02 | £7mn |  | 
| Anglo American plc | AAL | £29.54 | £34.8bn | FTSE 100 FTSE 350 FTSE Eurotop 100 S&P Global 100 CBOE 100 CBOE 350 STOXX600 | 
| Anglo Asian Mining | AAZ | £1.90 | £217mn |  | 
| Anglo-Eastern Plantations plc | AEP | £13.45 | £524mn |  | 
| Angus Energy Plc | ANGS | £0.00 | £11mn |  | 
| Animalcare Group Plc | ANCR | £2.60 | £179mn |  | 
| Anpario Plc | ANP | £5.00 | £103mn |  | 
| Antofagasta plc | ANTO | £28.54 | £28.1bn | FTSE 100 FTSE 350 CBOE 100 CBOE 350 STOXX600 | 
| AO World Plc | AO. | £1.07 | £618mn | CBOE 250 CBOE 350 | 
| Apax Global Alpha Limited | APAX | £1.64 | £793mn | FTSE 250 FTSE 350 | 
| Appreciate Group Plc | APP | £0.42 | £79mn |  | 
| Aptamer Group Plc | APTA | £0.01 | £23mn |  | 
| Aquila Energy Efficiency Trust Plc | AEET | £0.27 | £22mn |  | 
| Aquila European Renewables plc | AERI | £0.38 | £145mn |  | 
| Arbuthnot Banking Group Plc. | ARBB | £9.08 | £150mn |  | 
| Arcontech Group Plc | ARC | £0.94 | £13mn |  | 
| Argentex Group Plc | AGFX | £0.03 | £3mn | BEL 20 | 
| Argo Blockchain Plc | ARB | £0.03 | £21mn |  | 
| Arix Bioscience Plc | ARIX | £1.42 | £184mn |  | 
| Artemis Alpha Trust plc | ATS | £3.72 | £122mn |  | 
| Artemis UK Future Leaders Plc | AFL | £3.78 | £115mn |  | 
| Ascential plc | ASCL | £5.67 | £1.2bn | FTSE 250 FTSE 350 CBOE 250 CBOE 350 | 
| Ashmore Group | ASHM | £1.91 | £1.4bn | FTSE 350 FTSE 250 CBOE 250 CBOE 350 | 
| Ashoka India Equity Investment Trust Plc | AIE | £2.82 | £476mn |  | 
| Ashoka WhiteOak Emerging Markets Trust plc | AWEM | £1.49 | £57mn |  | 
| Ashtead Group plc | AHT | £51.52 | £21.7bn | FTSE 350 FTSE 100 CBOE 100 CBOE 350 STOXX600 |