Managed security service providers (MSSPs) are hot commodities in the channel right now.

GuardiCore was one of the companies that updated its program in order to attract and support MSSPs. Multiple IT companies announced their entrance into the channel or formalized a partner program last month.

There were also some familiar faces making moves.

Zayo announced several changes that follow an expanding product set, and Rackspace enhanced its program to mesh with its acquisition of Datapipe. ACC Business welcomed a pair of masters into its new $2 million club and Avaya expanded its cloud channel program.

Scroll through the gallery below to see 15 of the biggest channel program changes from April.

Missed last month’s channel-program recap? Check out the March review.