| Abbreviation | Definition |
|---|---|
| IIT | Ind.inv.tst |
| IKA | Ilika Plc |
| IKK | Inch Kenneth |
| ILA | Ila Group |
| ILH | Invesco Lev. |
| ILI | Imagelinx |
| ILV1 | Ingenious 1 |
| ILV2 | Ingenious 2 |
| ILX | Ilx |
| IMAC | Ingenious Med |
| IMD | Independent Media Distributors (de-listed) |
| IME | Immedia |
| IMG | Imagintn.tech |
| IMI | IMI, PLC. |
| IMIC | Intl Min&in Crp |
| IMJ | Imjack |
| IMM | Immupharma |
| IMT | Imperial Tobacco Group, PLC. |
| IMTK | Imaginatik |
| INB | Interbulk Group |