How do I change the categories in the OCC? Click the categories under the “OCC” to change graphs. This raw data is provided once each week by the OCC, which tags order flow with variables such as “opening” or “closing”. Subscribers can access SpotGamma's OCC Premiums and Contracts Analysis here. Related articles What are Vanna Charts? How do I use the OCC data? What is the OCC Indicator? When do the Vanna Chart levels update? What is included in each SpotGamma subscription level?