| Abbreviation | Definition |
|---|---|
| LPTHA | Lightpath Technology, Inc. Class A |
| LPTHZ | Lightpath Technology, Inc. |
| LPTI | Longport, Inc. |
| LPWR | Laser Power Corporation |
| LQID | Liquid Audio, Inc. |
| LRCI | Legal Research Center, Inc. |
| LRCX | Lam Research Corporation |
| LRSI | LifeRate Systems, Inc. |
| LSBBE | L S B Industries, Inc. |
| LSBDE | L S B Industries, Inc. |
| LSBI | L S B Financial Corporation, Inc. |
| LSBX | Lawrence Savings Bank |
| LSCC | Lattice Semiconductor Corporation |
| LSCO | Lesco, Inc. |
| LSCP | Laserscope |
| LSER | Laser Corporation |
| LSON | Lason, Inc. |
| LSPN | Lightspan Partnership, Inc. |
| LSPT | Laser Photonics, Inc. |
| LSRB | Los Robles Bancorp |