| BlackBox Limited | Private company limited by shares | Live |
| BLACKBOX LIMITED | | Live |
| Blackbox ALGO Limited | Private company limited by shares | Live |
| Blackbriar Limited | Private company limited by shares | Live |
| Blackbuck Networks Limited | Private company limited by shares | Live |
| BLACKBULL MVM LIMITED | Private company limited by shares | Live |
| BlackBullet Limited | | Live |
| BLACKBURN LIMITED | Private company limited by shares | Live |
| BlackCard Limited | | Live |
| Blackcarte Limited | Private company limited by shares | Live |
| Blackcloud Limited | Private company limited by shares | Live |
| BLACKCOMB LIMITED | Private company limited by shares | Dissolved |
| Blackcorns Investment & Trading Limited | Private company limited by shares | Live |
| BLACKCOW CAPITAL HOLDING GROUP LIMITED | Private company limited by shares | Live |
| BLACKCYBER LIMITED | Private company limited by shares | Live |
| Blackdeer Limited | | Live |
| BLACKDOG LIMITED | Private company limited by shares | Live |
| BLACKDOG ASIA LIMITED | Private company limited by shares | Live |
| Blackdot Music Limited | Private company limited by shares | Live |
| BLACKDOWN LIMITED | Private company limited by shares | Dissolved |
| Blackdown Hills Limited | | Live |
| BLACKDRIP LIMITED | Private company limited by shares | Live |
| BlackDrops Limited | Private company limited by shares | Live |
| HK BlackEight Biotechnology Co., Limited | | Live |
| BLACKER LIMITED | Private company limited by shares | Live |
| MARK C. BLACKER & ASSOCIATES LIMITED | Private company limited by shares | Dissolved |
| BLACKET INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| Blackface Limited | Private company limited by shares | Live |
| BLACKFAIR LIMITED | Private company limited by shares | Live |
| BLACKFIELD LIMITED | Private company limited by shares | Live |
| Blackfil HK Limited | | Live |
| Blackfin Limited | Private company limited by shares | Live |
| BlackFintech Limited | | Live |
| BLACKFISH LIMITED | Private company limited by shares | Dissolved |
| Blackfish E-Commerce Limited | Private company limited by shares | Live |
| BLACKFISH TRADING LIMITED | | Live |
| BLACKFISK STUDIO LIMITED | Private company limited by shares | Live |
| Hongkong Blackflame Trading Co., Limited | Private company limited by shares | Live |
| BLACKFLEET 9 LIMITED | Private company limited by shares | Live |
| BLACKFLOWER LIMITED | Private company limited by shares | Dissolved |
| BLACKFORD LIMITED | Private company limited by shares | Dissolved |
| BLACKFORD LIMITED | Private company limited by shares | Live |
| BLACKFORD ASIA LIMITED | | Live |
| Blackfort Capital Limited | Private company limited by shares | Live |
| BLACKFOX INTERNATIONAL EFFECTS PRODUCTION CO., LIMITED | Private company limited by shares | Live |
| Blackfoxman Limited | Private company limited by shares | Live |
| BLACKFRIARS LIMITED | Private company limited by shares | Dissolved |
| BLACKFRIARS AGENCIES LIMITED | Private company limited by shares | Dissolved |
| BLACKGOLD CONCEPTS Limited | | Live |
| Blackgold Energy Limited | Private company limited by shares | Live |
| BLACKGOLD GLOBAL LIMITED | Private company limited by shares | Live |
| BLACKGOLD HOLDING LIMITED | Private company limited by shares | Dissolved |
| BLACKGOLD INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| Blackgold Ziene Holding Limited | Private company limited by shares | Live |
| HK BLACK-GRACE-WOLF INT'L GROUP LIMITED | Private company limited by shares | Dissolved |
| BLACKHAWK LIMITED | Private company limited by shares | Live |
| Blackheart Limited | Private company limited by shares | Dissolved |
| BLACKHEATH PARK LIMITED | Private company limited by shares | Dissolved |
| BLACKHILL LIMITED | Private company limited by shares | Live |
| Blackhill Limited | Private company limited by shares | Live |
| BLACKHILL GROUP LIMITED | Private company limited by shares | Dissolved |
| blackhill studio LIMITED | Private company limited by shares | Live |
| Blackhill Technology Group Limited | Private company limited by shares | Live |
| BlackHills Consulting Limited | Private company limited by shares | Live |
| Blackhole Capital Limited | Private company limited by shares | Live |
| Blackhole Enterprise Limited | Private company limited by shares | Live |
| BLACKHUSH LIMITED | Private company limited by shares | Dissolved |
| BLACKIE LIMITED | Private company limited by shares | Live |
| BLACKIE43 LIMITED | Private company limited by shares | Live |
| BLACKJACK LIMITED | Private company limited by shares | Dissolved |
| BLACKJACK LIMITED | Private company limited by shares | Dissolved |
| Blackjack Limited | Private company limited by shares | Live |
| BLACKJACK ENTERPRISE LIMITED | Private company limited by shares | Live |
| BLACKJACK NO.13 COMPANY LIMITED | Private company limited by shares | Live |
| BLACKJACQUES LIMITED | Private company limited by shares | Live |
| BLACKJAD LIMITED | Private company limited by shares | Live |
| Global Blackjaguar Co., Limited | Private company limited by shares | Live |
| BlackKite Capital Limited | Private company limited by shares | Live |
| BLACKKNIGHTS INVESTMENT CO., LIMITED | Private company limited by shares | Live |
| GGV (Blacklake) Limited | Private company limited by shares | Live |
| BLACKLAKE GLOBAL LIMITED | Private company limited by shares | Live |
| Blackland Group Limited | Private company limited by shares | Live |
| China Blackland Wine Industry Group Holding Co., Limited | Private company limited by shares | Live |
| BLACKLANDS LIMITED | Private company limited by shares | Dissolved |
| BLACKLANE Limited | Private company limited by shares | Live |
| Blacklight Limited | Private company limited by shares | Live |
| BLACKLINE IMPEX LIMITED | Private company limited by shares | Live |
| Blacklist International Limited | Private company limited by shares | Dissolved |
| BLACKLIST MEDIA HOLDINGS LIMITED | Private company limited by shares | Live |
| Black-M Machinery (China) Limited | Private company limited by shares | Live |
| Blackmagic Design H.K. Limited | Private company limited by shares | Live |
| BlackMarble Capital Limited | Private company limited by shares | Live |
| BlackMarble Asset Management Limited | Private company limited by shares | Live |
| Black.Mask Limited | Private company limited by shares | Live |
| BLACKMINE (HK) LIMITED | Private company limited by shares | Live |
| Blackmine (HK) Limited | Private company limited by shares | Live |
| Blackmo Company Limited | Private company limited by shares | Live |
| BLACKMOON LIMITED | Private company limited by shares | Live |
| E. W. BLACKMORE, LTD. | Private company limited by shares | Dissolved |
| BLACKMORE COMPANY LIMITED | Private company limited by shares | Dissolved |