Displaying categories in tables

I am designing a table for my company's dashboard. I need to show type of the data shown in the table. So far there is 6 type categories: Job ads, E-mail campaign, Display ads, Event, Referral and Headhunter. I was told to display it in the table without putting it there as a column.

This my wireframe so far. I was thinking about putting an icon but I was told it doesn't feel right with an icon and logo right next to it as it's too heavy. Anybody encountered similar problem? I am open to any suggestions.

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