Question of the day :
Which major publishing houses use Dorico to day ?
In France, whether it’s Lemoine, Billaudot or Leduc, composers are always asked for other files types (Finale, often, and sometimes Sibelius).
Which of the major German publishers (Henle, Breitkopf, Schott, Bärenreiter, etc.) now request and/or use Dorico ?
Just curious about the expansion of Dorico’s use in the world of music publishing., if you have infos.
It would be a great marketing topic! But if I remember well I think no big editor discloses any information. Probably many have in house modified products…
Maybe Faber Music lately?
But I’ll be happy to know any news 
In my experience with German publishers they don’t require specific software. They generally have a way things should look and be handled and as long as you can achieve that it doesn’t matter what you use and they will accommodate whatever the composer uses (as long as it’s one of the big three.) There are more and more composers coming with Dorico files and a couple of publishers have asked me specific questions with a view towards better integrating Dorico in their existing workflow but that has generally been individual editors and not some company-wide decision. Each publisher usually has a huge catalog with tons of files in different formats. So they tend to be software agnostic I find.
It’s rare for publishers to enforce specific software, because these days it’s relatively uncommon for origination work to be done in-house by people who work directly for the publisher. Although many publishers still retain in-house editors and production managers who use notation software, almost all engraving is done by freelance workers.
Most scores are submitted to publishers by composers/arrangers in digital form from one of the major notation applications, and typically that will then be the application that is used in the remainder of the production process. It’s rare for the publisher (or the engraver) to recreate the file in another application, though it does happen.
(It’s different, of course, if you’re a publisher focused on digital publication: in that case, file conversion is almost inevitable, due to the fragmented nature of the digital tools and platforms for music publishing.)
Dorico is used by lots of publishers, and more all the time, but mostly in cases where the composer or arranger uses Dorico to start with – and, again, there are more and more of these all the time.