This article lists and provides statistics for the frequency of advertisements on Cortex. There have been a total of 177 advertisements by 28 companies. Two Cortex episodes have had no sponsors, one has had one sponsor, five have had two sponsors, 54 have had three sponsors, and one, "Cortex No. 43: Tornado Bigshot", has had four sponsors. The sponsor with the most sponsorships is Hover, with 26 sponsorships, and the first Cortex sponsors were Backblaze and Igloo. Data about Audible book recommendations for each Audible sponsorship is located at List of Cortex Audible book recommendations.