I can confirm Bloomberg does this, u/quackware is correct. I went through the program myself recently, and it's actually a very nice dive into a unique full stack -- and because you take the training with a large group of peers, it's a good way to network as the company/make friends in a new location, especially if you're fresh out of a grad or undergrad program.
I know there were some issues with the program in the past (for instance, at one point you had to maintain at least an 80% "grade" in the program or you'd be cut loose from the company) but Bloomberg has really invested in the program recently and it's much more trainee-friendly these days. Lots of emphasis on cooperation and teamwork, and even though there are some solo timed "assessments" they're about the right level of challenge, and the goal is understandable -- they're there so the trainers can get a feel for what lessons work and what lessons need fixing.
Anyway, it was invaluable to me. I can't imagine jumping straight into a dev role at a company fresh out of college.