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- Oak Street Health
- Oak Woods Acquisition Corp.
- Oaktree Acquisition
- Oaktree Acquisition Corp. II
- Oaktree Acquisition Corp. III
- Oatly Group AB
- OCA Acquisition Corp.
- Ocean Biomedical
- Ocean Capital Acquisition Corp.
- OceanTech Acquisitions I Corp.
- Odd Burger Corp.
- ODDITY Tech Ltd.
- Ohmyhome Ltd
- OKYO Pharma, Ltd.
- Olaplex Holdings, Inc.
- Olema Pharmaceuticals
- Olink Holding AB
- Olo, Inc.
- Omega Alpha SPAC
- Omega Therapeutics
- Omnichannel Acquisition Corp.
- OmniLit Acquisition Corp.
- On Holding AG
- ON24, INC.
- Oncorus, Inc.
- one
- One Equity Partners Open Water I
- OneConnect Financial Technology
- OneWater Marine
- Onfolio Holdings Inc.
- Onion Global Limited
- ONS Acquisition Corp.
- Onyx Acquisition Co. I
- Oportun Financial
- Opthea Limited
- Opti-Harvest, Inc.
- OptMed, Inc.
- OPY Acquisition Corp. I
- Orange County Bancorp
- ORIC Pharmaceuticals
- Oriental Culture Holding LTD.
- Origin Life Sciences, Inc.
- Orion Acquisition Corp.
- Orion Biotech Opportunities Corp.
- Orisun Acquisition
- Orphazyme A/S
- Ortho Clinical Diagnostics Holdings plc
- OS Acquisition Corp.
- OS Therapies Inc.
- Oscar Health, Inc.
- Osiris Acquisition Corp.
- Osprey Technology Acquisition
- Osprey Technology Acquisition Corp. II
- Ostin Technology Group Co., Ltd.
- OTR Acquisition Corp.
- Outbrain Inc.
- Outset Medical
- Owl Rock Capital Corp.
- Oxbridge Acquisition Corp.
- OXUS ACQUISITION CORP.
- Oyster Enterprises Acquisition
- Oyster Point Pharma
- Ozon Holdings PLC
