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- Observe.AI 12 open
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- Ocado Group 50 open
- Occidental Petroleum 54 open
- Octopus Energy 173 open
- Odyssey 14 open
- Ohio State University 1,088 open
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- Oklo 53 open
- Olympus 120 open
- Omni 20 open
- Onebrief 23 open
- ONEOK 106 open
- onsemi 732 open
- Ontic 11 open
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- Optimizely 47 open
- Options Technology 22 open
- Orb 13 open
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- OSB Group 9 open
- Oshkosh Corporation 116 open
- Osmind 2 open
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- Outokumpu 82 open
- Outschool 5 open
- Outset 19 open
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- Overview 60 open
- Ovintiv 1 open
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- Oxa 5 open
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