| Symbol | Name | Country | Exchange |
|---|---|---|---|
| MFCO | Microwave Filter C | US | OTC |
| 032960 | Dongil Technology Ltd | KR | KQ |
| 073110 | LMS Co. Ltd | KR | KQ |
| 151910 | Nanos Co. Ltd | KR | KQ |
| 256150 | Handok Clean Tech Co. Ltd | KR | KQ |
| 002273 | Zhejiang Crystal Optech Co Ltd | CN | SHE |
| 002962 | W olf Photoelectric Technology Ltd | CN | SHE |
| IS7 | InTiCa Systems AG | DE | XETRA |
| YMFCF | Yamashin-Filter Corp | US | US |