How do I cite a paper by a person plus a company?
In deciding who to list as the author of the paper, I wouldn't pay any attention to the copyright line.  Academic standards are not concerned with who owns the paper legally, but who actually made it.

For a recent paper I co-wrote, we signed over the copyright to the publisher.  So if you look at its copyright line, you'll see "American Mathematical Society".  That doesn't mean you should cite the paper as having been authored by the American Mathematical Society.

What name(s) appear on the article's title page, right under the title itself?  That's who you should credit as the author of the paper.