| Abbreviation | Definition |
|---|---|
| IRD | International Road Dynamics, Inc. |
| IRG | Imvescor Restaurant Group Inc. |
| IRG | Imvescor Restaurant Group Incorporated |
| IRL | Minera IRL Limited |
| IRL | Minera IRL Limited (de-listed) |
| ISA | Isotechnika Pharma, Inc. |
| ISM | Inspiration Mining Corporation |
| ISN | Insignia Energy Ltd. |
| ISN | Insignia Energy LTD. (de-listed) |
| ISR | International Sovereign Energy Corp. |
| ISR | International Sovereign Energy Corporation |
| ITH | International Tower Hill Mines Ltd. |
| ITP | Intertape Polymer Group Inc. |
| ITP | Intertape Polymer Group Incorporated |
| IVA | Ivanhoe Australia Limited |
| IVN | Ivanhoe Mines Ltd. |
| IVN | Ivanhoe Mines, LTD. |
| IVW | Ivernia Inc. |
| IVW | Ivernia Incorporated (de-listed) |
| JAG | Jaguar Mining Inc. |