Many of you remember the European Union’s General Data Protection Regulation (GDPR) changes earlier this year. Or perhaps you’ve tried to block them out.

Either way, a little over three months later, the sky has not fallen.

After countless questions, Facebook Live sessions, discussions with lawyers and ad partners, Mediavine presented what we felt was the best plan for our publishers.

By providing the option to use our Content Management Platform (CMP), publishers could confidently comply with the EU regulations while minimizing any decreases in revenue.

We made this CMP optional for publishers, and about two-thirds ended up turning on the CMP in the Mediavine Dashboard, while the remaining third did not.

How did the GDPR changes affect publishers in each of these two groups? Now that the dust has settled, we are able to share results from a few months of data.

Comparing ad performance in the U.S. for non-CMP sites vs. CMP sites, we noticed a 1% difference in CPMs, fill rates and other revenue metrics.

Performance of the two groups is very similar, which makes the GDPR findings even more interesting. Comparing earnings from March-April (Pre GDPR) to June-July (Post GDPR) we found:

• CPM for sites with Mediavine CMP: +9.3%
• CPM for sites without a CMP: -44%

The difference was equally striking in terms of impressions filled:

• Fill rate for sites with Mediavine CMP: +5%
• Fill rate for sites without a CMP: -34.4%

Comparing non-CMP sites with U.S. buyers, we saw an increase in eCPM in June-July of 1% and a decrease in fill rate of 1%.

CMP sites, meanwhile, saw a U.S. eCPM increase of 2% and a fill rate increase of less than 1%.

We are confident that the CMP is a major contributor to higher revenue and CPMs, and strongly recommend turning on this feature to reap the benefits if you haven’t already. Find out how in this help doc and email publishers@mediavine.com with any questions.