- Offering price
- Official Market (Amtlicher Markt)
- Offsetting transaction
- Omega (warrants)
- Open Market (Freiverkehr)
- Open outcry
- Opening price
- Opération blanche
- Operational profit
- Option
- Option premium
- Option premium
- Option writer
- Order
- Order book
- Order book statistics
- Order routing
- Ordinary share
- OTC (over-the-counter) trading
- Other types of certificates
- Out of the money (warrants)
- Outperformance certificate
- Overweight
