Sometimes exploiting a positive risk is not possible without collaboration. Sharing a positive risk is when you collaborate with another department or organization to exploit a positive risk. For example, after conducting a SWOT Analysis, you have determined that a business deal is worth pursuing. You are required to use Agile development practices. In your company, there is no expertise in Agile development. Hence, you partner with another organization, which has skilled ScrumMasters, that specialize in Agile development. With this collaborative strategy, both parties benefit.
Note: It is common for even competitors to collaborate, such as when car companies share a manufacturing plant to reduce production costs.