| Abbreviation | Definition |
|---|---|
| HSACY | Horace Small Apparel, P. L. C. |
| HSBDF | H S B C Holdings, P. L. C. |
| HSDC | Health Systems Design Corporation |
| HSDMF | Hemisphere Development Corporation |
| HSIC | Henry Schein, Inc. |
| HSII | Heidrick & Struggles International, Inc. |
| HSKA | Heska Corporation |
| HSLPP | Houston Lighting & Power Company Preferred |
| HSNS | High Speed Net Solutions |
| HSOG | Home Stake Oil & Gas Company |
| HSPA | Historic Hotel Holdings, Inc. |
| HSRC | Halstead Energy Corporation |
| HSSC | Home Savings Bank of Siler City (delisted) |
| HSSI | Hospital Staffing Service |
| HSTD | Homestead Bancorp, Inc. |
| HSTE | High Street Banking Company |
| HSTR | American Homestar Corporation |
| HSVLY | Highveld Steel & Vanadium, LTD. |
| HTAVF | Heritage American Resources Corporation |
| HTBK | Heritage Commerce Corporation |