 3I Group PLC | III | GB00B1YW4409 | |
 Ibstock PLC | IBST | GB00BYXJC278 | |
| Icfg Limited | ICFG | GG00BPGZTM87 | |
 ICG Enterprise Trust PLC | ICGT | GB0003292009 | |
| ICG PLC | ICG | GB00BYT1DJ19 | |
 Iconic Labs PLC | ICON | GB00BRBJ3P08 | |
 Idox PLC | IDOX | GB0002998192 | |
 IG Design Group PLC | IGR | GB0004526900 | |
 IG Group Holdings PLC | IGG | GB00B06QFB75 | |
 Ikigai Ventures Limited | IKIV | GG00BPG8J619 | |
 Ilika PLC | IKA | GB00B608Z994 | |
 Image Scan Holdings PLC | IGE | GB0031410581 | |
| Imaging Biometrics Limited | IBAI | JE00BD4H0R42 | |
| Imara Gold PLC | IGLD | GB00BYZC5R04 | |
 IMC Exploration Group PLC | IMC | IE00B6WC2H62 | |
| IMI PLC | IMI | GB00BGLP8L22 | |
 Immupharma PLC | IMM | GB0033711010 | |
 Impax Asset Management Group PLC | IPX | GB0004905260 | |
 Impax Environmental Markets PLC | IEM | GB0031232498 | |
| Imperial Brands PLC | IMB | GB0004544929 | |
| Inchcape PLC | INCH | GB00B61TVQ02 | |
 India Capital Growth Fund Limited | IGC | GB00B0P8RJ60 | |
| Indivior PLC | INDV | GB00BN4HT335 | |
 Indus Gas Limited | INDI | GG00B39HF298 | |
 Informa PLC | INF | GB00BMJ6DW54 | |
 Ingenta PLC | ING | GB00B3BDTG73 | |
 Inland ZDP PLC | INLZ | GB00B99R1Q79 | |
 Insig AI PLC | INSG | GB00BYV31355 | |
 Inspiration Healthcare Group PLC | IHC | GB00BXDZL105 | |
| Inspired PLC | INSA | GB00BT9PTQ73 | |
 Inspired PLC | INSE | GB00BR2Q0V58 | |
| Inspirit Energy Holdings PLC | INSP | GB00B44W9L31 | |
 Integrafin Holdings PLC | IHP | GB00BD45SH49 | |
 Integrated Diagnostics Holdings PLC | IDHC | JE00BLKGSR75 | |
 Intercede Group PLC | IGP | GB0003287249 | |
 Intercontinental Hotels Group PLC | IHG | GB00BHJYC057 | |
 International Biotechnology Trust PLC | IBT | GB0004559349 | |
 International Consolidated Airlines Group S.A. | IAG | ES0177542018 | |
| International Paper Company | IPC | US4601461035 | |
| International Personal Finance PLC | IPF | GB00B1YKG049 | |
 International Public Partnerships Limited | INPP | GB00B188SR50 | |
 International Workplace Group PLC | IWG | JE00BYVQYS01 | |
 Intertek Group PLC | ITRK | GB0031638363 | |
 Intuitive Investments Group PLC | IIG | GB00BPTH6Y20 | |
| Invesco Asia Dragon Trust PLC | IAD | GB0004535307 | |
| Invesco Global Equity Income Trust PLC | IGET | GB00B1DQ6472 | |
| Investacc Group Limited | INAC | VGG5877D1033 | |
| Investec PLC | INVP | GB00B17BBQ50 | |
 Investec PLC | INVR | GB00B19RX541 | |
 Invinity Energy Systems PLC | IES | GB00BS9F9D74 | |
 Iofina PLC | IOF | GB00B2QL5C79 | |
 Iomart Group PLC | IOM | GB0004281639 | |
 IP Group PLC | IPO | GB00B128J450 | |
 IQE PLC | IQE | GB0009619924 | |
 Irish Continental Group PLC | ICGC | IE00BLP58571 | |
 Ironveld PLC | IRON | GB0030426455 | |
 Itaconix PLC | ITX | GB00BPK3YZ68 | |
 Ithaca Energy PLC | ITH | GB00BPJHV584 | |
 Itim Group PLC | ITIM | GB00BMD2H500 | |
 ITM Power PLC | ITM | GB00B0130H42 | |
| ITV PLC | ITV | GB0033986497 | |
 Ixico PLC | IXI | GB00BFXR4C20 | |
 Schroders Capital Global Innovation Trust PLC | INOV | GB00BVG1CF25 | |
 The Investment Company PLC | INV | GB00BV4FKD05 | |
