According to three advertisers contacted by the Financial Times, they were offered refund offers in the region of "a couple of dollars" or similar amounts.
YouTube parent Google’s advertising policy says that brands may ask for a credit where ads run on websites that were not part of campaign plans.
The company has come under fire following The Times’ exposé earlier this year that YouTube ads had appeared on terror websites and other extremist channels.
Marks & Spencer, Havas, the BBC, Channel 4, ITV, The Guardian and the UK government have all told the FT they have not yet returned to YouTube.
Campaign has contacted Google for comment. The company did not comment directly on the refunds that it was offering to brands.