Know-How Exchange : Student Questions

I am working on a Master Thesis (marketing and Finance) at the RSM Erasmus University. For that purpose I execute a research to co-branding and company value. Over the last week I have searched for a comprehensive list of co-branding alliances. The best possible alternative which I have found is the MarketLine Database, though the information on co-branding deals is fairly limited in this database and you are only able to narrow the search down to co-Marketing.
Because of my methodology I am especially interested in co-branding alliances between two listed companies. Would somebody know a proper souce to use for this purpose?

Thanks in advance!