| 5 O.P.T. LIMITED | Private company limited by shares | Dissolved |
| OPTOMETRY (OPT) CENTRE LIMITED -THE- | Private company limited by shares | Live |
| OPTACE TECHNOLOGIES CO., LIMITED | Private company limited by shares | Live |
| Nanpeng Optact Vision Investment Holdings Co., Limited | | Live |
| Optact Vision Limited | | Live |
| OPTAGON LIMITED | Private company limited by shares | Live |
| OptAim (HK) Limited | Private company limited by shares | Live |
| OPTAKE INDUSTRIAL LIMITED | Private company limited by shares | Live |
| Optal Asia Limited | Private company limited by shares | Live |
| Optamac HK Limited | Private company limited by shares | Live |
| OPTAMAX LIMITED | Private company limited by shares | Live |
| OPTANA LIMITED | Private company limited by shares | Dissolved |
| OPTARE CONSULTANCY LIMITED | Private company limited by shares | Live |
| OPTASIA LIMITED | Private company limited by shares | Live |
| OptAsia Healthcare Limited | Private company limited by shares | Live |
| OPTATIVE COMPANY LIMITED | Private company limited by shares | Live |
| OPTCLA INTERNATIONAL CO., LIMITED | Private company limited by shares | Dissolved |
| OPTCOM TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| OPTCOOL LIMITED | Private company limited by shares | Live |
| OPTCORE TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| OPTDEAL LIMITED | Private company limited by shares | Live |
| OPTDISPLAY TECHNOLOGY (H.K) CO., LIMITED | Private company limited by shares | Live |
| SHENZHEN OPTE ENERGY DEVELOPMENT CO., LIMITED | Private company limited by shares | Live |
| OPTE OPTOELECTRONIC (HONGKONG) CO., LIMITED | Private company limited by shares | Dissolved |
| Optec Co., Limited | Private company limited by shares | Live |
| OPTEC ELECTRONICS LIMITED | Private company limited by shares | Live |
| GIKEN OPTEC (ASIA) LIMITED | Private company limited by shares | Live Commenced dormancy on 21-Sep-2015 |
| GIKEN OPTEC HONG KONG LIMITED | Private company limited by shares | Live |
| OPTEC (HONG KONG) LIMITED | Private company limited by shares | Live |
| KOCENT OPTEC LIMITED | Private company limited by shares | Live |
| OPTEC TECHNOLOGY LIMITED | Private company limited by shares | Live |
| OPTECH LIMITED | Private company limited by shares | Dissolved |
| CHINTEK OPTECH LIMITED | Private company limited by shares | Live |
| Optech Co., Limited | Private company limited by shares | Live |
| OPTECH HEALTHCARE CO., LIMITED | Private company limited by shares | Dissolved |
| OPTECH ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| HK GENGMING OP-TECH COMPANY LIMITED | Private company limited by shares | Live |
| OP-TECH PHOENIX COMPANY LIMITED | Private company limited by shares | Dissolved |
| VARITRONIX OPTECH LIMITED | Private company limited by shares | Dissolved |
| WISE POWER OPTECH COMPANY LIMITED | Private company limited by shares | Live |
| OPTECK INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| OPTECK MANUFACTURING GROUP LIMITED | Private company limited by shares | Live |
| OPTECS LIMITED | | Live |
| OPTEGY LIMITED | Private company limited by shares | Live |
| OPTEK CO., LIMITED | Private company limited by shares | Live |
| ADVANCED OPTEK CO., LIMITED | Private company limited by shares | Live |
| OPTEK ELECTRONICS COMPANY LIMITED | Private company limited by shares | Live |
| Optek Technology Limited | Private company limited by shares | Dissolved |
| OP-TEK TECHNOLOGY LIMITED | Private company limited by shares | Live |
| DAE YANG OPTEK LIMITED | Private company limited by shares | Live |
| OPTEL LIMITED | Private company limited by shares | Dissolved |
| Optel Company Limited | Private company limited by shares | Live |
| OPTELE CHANNEL LIMITED | Private company limited by shares | Dissolved |
| OPTEN LIMITED | Private company limited by shares | Dissolved |
| Opter Limited | | Live |
| OPTERNA TECHNOLOGIES COMPANG LIMITED | Private company limited by shares | Live |
| OPTEX LIMITED | Private company limited by shares | Dissolved |
| OPTEX (H.K.) LIMITED | Private company limited by shares | Live |
| OPTEX INTERNATIONAL LIMITED | | Live |
| Optex Technology Co., Limited | Private company limited by shares | Live |
| EXMAR OPTI LIMITED | Private company limited by shares | Live |
| OPTIAIRE LIMITED | Private company limited by shares | Dissolved |
| Optiarc Limited | Private company limited by shares | Live |
| OPTIBEST TECHNOLOGY LIMITED | Private company limited by shares | Live |
| OPTIBIZ (HONG KONG) LIMITED | Private company limited by shares | Live |
| OPTIC INN LIMITED | Private company limited by shares | Dissolved |
| NCC OPTIC LIMITED | Private company limited by shares | Dissolved |
| GK OPTIC LIMITED | Private company limited by shares | Dissolved |
| DGN OPTIC HK LIMITED | Private company limited by shares | Live |
| OPTIC PRO COMPANY LIMITED | Private company limited by shares | Live |
| Carelink Optic Limited | Private company limited by shares | Live |
| CHUNG YAT OPTIC COMPANY LIMITED | Private company limited by shares | Live |
| DONG FANG OPTIC INVESTMENT LIMITED | Private company limited by shares | Live |
| HUMAN OPTIC COMPANY LIMITED | Private company limited by shares | Live |
| Icon Optic Limited | Private company limited by shares | Live |
| SHENZHEN JIAFU OPTIC COMPANY LIMITED | Private company limited by shares | Live |
| KEVIN OPTIC COMPANY LIMITED | Private company limited by shares | Live |
| Ju Liang Optic Limited | Private company limited by shares | Live |
| OTTO OPTIC LIMITED | Private company limited by shares | Live |
| TIME OPTIC COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPTIC2DAY HK LIMITED | Private company limited by shares | Live |
| OPTICA LIMITED | Private company limited by shares | Dissolved |
| OPTICA LIMITED | Private company limited by shares | Live |
| LAP HIN OPTICAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| ITO OPTICAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| ANN OPTICAL LIMITED | Private company limited by shares | Dissolved |
| YAU YEE OPTICAL COMPANY LIMITED | Private company limited by shares | Live |
| HO HOP OPTICAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| SKY OPTICAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| FOX OPTICAL COMPANY LIMITED | Private company limited by shares | Live |
| C. D. OPTICAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPTICAL 88 LIMITED | Private company limited by shares | Live |
| 68 OPTICAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIC SUN OPTICAL LIMITED | Private company limited by shares | Dissolved |
| TOP OPTICAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| K. H. OPTICAL COMPANY LIMITED | Private company limited by shares | Live |
| P & C OPTICAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| U OPTICAL LIMITED | Private company limited by shares | Live |
| TEN TO TEN OPTICAL LIMITED | Private company limited by shares | Dissolved |
| IN OPTICAL COMPANY LIMITED | Private company limited by shares | Dissolved |