If you are asking a question, my answer is:

Two steps.

First: find out the ID of all Marvel companies.
https://api.themoviedb.org/3/search/company?api_key=[MY_KEY]&query=Marvel&page=1

total_pages 1
total_results   12

Second: search the movies with the filter for company IDs.
In this example, I put only 5 IDs: 420|19551|38679|2301|13252

https://api.themoviedb.org/3/discover/movie?api_key=[MY_KEY]&language=en-US&sort_by=primary_release_date.desc&page=1&with_companies=420|19551|38679|2301|13252

https://api.themoviedb.org/3/discover/movie?api_key=[MY_KEY]&language=en-US&sort_by=primary_release_date.desc&page=1&with_companies=420|19551|38679|2301|13252

thanks for answer