| Symbol | Name | Country | Exchange |
|---|---|---|---|
| KN | Knowles Corporation | US | NYSE |
| AACAF | AAC Technologies Holdings Inc. | US | OTC |
| AACAY | AAC Technologies Holdings Inc. | US | OTC |
| ANDR | Andrea Electronics Corporation | US | OTC |
| TVBCF | Television Broadcasts Ltd | US | OTC |
| AVD | American Vanguard Corporation | DE | F |
| 091120 | EM-Tech.CO. LTD | KR | KQ |
| 002655 | Shandong Gettop Acoustic Co Ltd | CN | SHE |
| CRLI | Circuit Research Labs Inc | US | OTC |