L0tsaluck - there were many, many posts on this board discussing this topic.
For Vascepa, from manufacturing (or oil refining in V's case) to encapsulation, to bottling and packaging, to put labels on the bottles and packages, to distribution, are done by independent contractors that Amarin hires. Amarin does not own any part of this process. Amarin only owns the label content (what is written on the labels), the rights of selling V according to the label content, a bunch of patents to protect these rights and a bunch of agreements with those independent contractors. Amarin also owns its teams of salespeople, RA, clinical scientists, marketing, PR, etc. The trials were conducted by CRO obviously. In a sense, Amarin acts as a project manager coordinating all the parties to get things moving.
Hope this won't shock you. Happy Thanksgiving!