The phrase "huge conglomerate" refers to a large corporation or company that owns many smaller companies, often in different industries. Full definition
How are indie authors going to compete and thrive against huge conglomerate corporations? (ronvitale.com)
Did you notice that book promotion opportunities with smaller media outlets, such as local radio stations (that used to be hosted by local radio personalities), were drying up as smaller media outlets were bought by bigger media outlets, and bigger media outlets were bought by huge conglomerates such as Clear Channel? (bookpr.com)
Instead of huge conglomerates, the orange world is run by specialized smaller companies that operate on a low impact / high technology model with a goal to maximize flexibility and minimize cost. (inc.com)