| Objectmatch | 🍎 | 1 | — | Shopping |
| Objektiv | 🍎 | 1 | 2.6★ | News |
| Oblador AB | 🍎 | 1 | 4.4★ | Utilities |
| Obraj, Inc | 🍎 | 1 | 5.0★ | Finance |
| Obscure Engineering, LLC | 🍎 | 1 | 4.6★ | Music |
| Observa | 🍎 | 1 | 4.4★ | Business |
| Observer Media Group, Inc. | 🍎 | 1 | 5.0★ | Magazines & Newspapers |
| Obshem Tazkhel | 🍎 | 1 | 4.1★ | Lifestyle |
| Ocado Retail Ltd | 🍎 | 1 | 5.0★ | Shopping |
| Occupational Health Clinics for Ontario Workers | 🍎 | 1 | — | Utilities |
| Ocean AI Co., Ltd. | 🍎 | 1 | 4.5★ | Music |
| Ocean Cheung | 🍎 | 1 | — | Developer Tools |
| Ocean City New Jersey | 🍎 | 1 | 4.3★ | Travel |
| Ocean Friends Inc | 🍎 | 1 | 4.6★ | Health & Fitness |
| Ocean Lab, LLC | 🍎 | 1 | 4.5★ | Finance |
| Ocean Labs Technologies | 🍎 | 1 | — | Lifestyle |
| Ocean Life Insurance Public Company Limited | 🍎 | 1 | 3.7★ | Lifestyle |
| Ocean Network Express PTE.LTD | 🍎 | 1 | 4.4★ | Business |
| Ocean Pacific Gym & Wellness ii, LLC | 🍎 | 1 | 5.0★ | Health & Fitness |
| OceanBytes Holding LLC | 🍎 | 1 | 3.7★ | Navigation |
| OceanFirst Bank - Mobile Banking | 🍎 | 1 | 4.8★ | Finance |
| OceanHero GmbH | 🍎 | 1 | 4.7★ | Utilities |
| OceanSky Tech Limited | 🍎 | 1 | 3.0★ | Book |
| Oceanevo Global | 🍎 | 1 | 4.7★ | Lifestyle |
| Ocho Holdings Co. | 🍎 | 1 | 4.7★ | Finance |
| Ochy | 🍎 | 1 | 4.6★ | Sports |
| Ockeroborgen AB | 🍎 | 1 | 5.0★ | Health & Fitness |
| Oconto County Sheriff's Office | 🍎 | 1 | 5.0★ | Reference |
| Octagon NFT LLC | 🍎 | 1 | 5.0★ | Finance |
| Octane Coffee | 🍎 | 1 | 4.4★ | Food & Drink |
| Octapharma Plasma Inc. | 🍎 | 1 | — | MEDICAL |
| Octo Computer | 🍎 | 1 | 5.0★ | Photo & Video |
| OctoSec AS | 🍎 | 1 | — | Travel |
| Octocon, LLC | 🍎 | 1 | 4.0★ | Health & Fitness |
| Octodev Ltd | 🍎 | 1 | 4.6★ | Music |
| Octys LLC | 🍎 | 1 | 5.0★ | Navigation |
| Ocular IoT LLC | 🍎 | 1 | — | Business |
| Ocusun, LLC | 🍎 | 1 | 4.9★ | Shopping |
| Oda Norway AS | 🍎 | 1 | 4.7★ | Shopping |
| Odakyu Electric Railway Co.,Ltd. | 🍎 | 1 | 4.0★ | Travel |
| Odd Lab | 🍎 | 1 | 4.5★ | Productivity |
| Oddrok Oy | 🍎 | 1 | 4.6★ | Games |
| OddsChoice | 🍎 | 1 | 5.0★ | Sports |
| OddsJam | 🍎 | 1 | 4.7★ | Sports |
| Odense Sport & Event | 🍎 | 1 | — | Sports |
| Odessa Salon At Surrey LLC | 🍎 | 1 | 5.0★ | Lifestyle |
| Odido Netherlands B.V. | 🍎 | 1 | 4.4★ | Utilities |
| Odilon Vidal | 🍎 | 1 | — | Productivity |
| Odin Brousseau | 🍎 | 1 | 4.6★ | Lifestyle |
| Odin Inc. | 🍎 | 1 | 5.0★ | Business |