Lawyers can work for a corporate client, but those corporations can't offer legal advice to third parties.
Law firms that take on clients must be lawyer-owned.
"Under Attorney Rule of Professional Conduct 5.4, law firms are barred from offering ownership or other investment/revenue-sharing opportunities to non-lawyers. Some recent developments in several states, however, offer the possibility that these long-standing restrictions could be scaled back, creating potential for dramatic changes in how litigation matters are funded and managed."
https://www.thomsonreuters.com/en-us/posts/legal/practice-in...