| Symbol | Name | Country | Exchange |
|---|---|---|---|
| COHR | Coherent, Inc. | US | NASDAQ |
| IIVIP | II-VI Incorporated - 6.00% Series A Mandatory Convertible Preferred Stock | US | NASDAQ |
| NOVT | Novanta Inc. | US | NASDAQ |
| VIAO | VIA optronics AG | US | NYSE |
| DYSL | Dynasil Cp America | US | OTC |
| INRD | Inrad Optics Inc | US | OTC |
| ONTZF | O-Net Technologies Group Ltd | US | OTC |
| PEYE | Precision Optics Corporation Inc | US | OTC |
| GHH | Gooch & Housego Plc | UK | LSE |
| 3406 | Genius Electronic Optical Co Ltd | TW | TW |