Integral Ad Science, which sells brand safety and ad verification solutions to advertisers, is raising its prices, three sources with direct knowledge told ADWEEK.

Clients of Yahoo's demand-side platform were informed of the price raise with an in-platform notification, said Johnathan Barnes, who also helps advertisers navigate brand safety challenges with his firm Population Science. A second source, who requested anonymity to discuss private conversations, was informed of the price changes via Yahoo's DSP. Barnes said the new prices go into effect on November 1.