WWE President Nick Khan revealed WrestleMania 38 this past April was the most viewed WWE premium live event of all time for the company during today's First Quarter 2022 Earnings call from WWE headquarters in Stamford, CT. 

He also noted it was the second most-watched event on Peacock:

"In 2021, we saw a 15% increase in viewership from 2020, which was the last WrestleMania to air in the US on WWE Network. This momentum continued into 2022, where this past month we saw 61% increase from 2021. We doubled WWE viewership in total on Peacock over the past WrestleMania weekend compared to the year prior. We did not hit a ceiling our first year on Peacock. During WrestleMania weekend, nearly one-third of all Peacock accounts viewed WWE content. WrestleMania 38 was the second most-watched live event in the history of Peacock behind only this year's Super Bowl"

Khan also confirms it was watched by an impressive 56.1 million in India, a 29% increase on the year previous.