| Abbreviation | Definition |
|---|---|
| HYC | Hyder Cons |
| HYD | Hydro Intl |
| HYDG | Hydrogen |
| HYDR | Jsc Rus |
| HYF | Himalayan Fd |
| HYG | Hygea Vct |
| HYNS | Haynes Publshg. |
| HYR | Hydrodec |
| HYUD | Hyundai Mtr.gdr |
| HYUO | Hyundai M.gds O |
| HYUP | Hyundai M.gds P |
| HYXS | Hynix Semi |
| HZM | Horizonte Min. |
| HZN | Horizon Acqn |
| IAE | Ithaca Energy |
| IAEM | Impax Asian |
| IAES | Impax Asian Sub |
| IAG | Intl Consol Air |
| IAP | Icap |
| IAT | Invesco Asia |