Hybrid Publishing

What is a Hybrid Publisher: A publisher utilizing an author-subsidized business model for the majority of its business. Hybrid publishing companies behave just like traditional publishing companies in all respects, except that they publish books using an author-subsidized business model, as opposed to financing all costs themselves and, in exchange, return a higher-than-industry-standard share of sales proceeds to the author. A hybrid publisher makes income from a combination of publishing services and book sales.

Hybrid Publisher Criteria by the Independent Book Publishers Association.
Types of Hybrid Publishers (per Jane Friedman)

Editorially curated such as Wonderwell and Greenleaf Book Group.
Crowdfunding driven such as Inkshares and Unbound.
Assisted self-publishing aka “vanity” publishing.
Traditional publishers with a self-publishing arm.