Debian-based distribution vendors form the Debian Common Core Alliance

The press release says
it:

Major Linux vendors and
non-profit organizations today officially launched the DCC Alliance. The
Alliance plans to assemble a common, standards-based Debian core for
Debian-based Linux distributions, accelerate worldwide commercial adoption
of Debian, promote compatibility among the growing community of Debian
derivatives, and work with Debian on features important to commercial
adoption such as a predictable release cycle and Linux Standard Base (LSB)
compliance.

Interestingly, Ubuntu is not part of the founding members.