There's nothing to stop you doing that, JIRA doesn't really care how you use your licence allocations.
Payment might be a bit of a pain though, there's no facility for splitting payments really, you get one bill. It's probably easier for you to handle the licence through one company, and have an internal process where the other company pays the first one for its share of the licence. But if that's hard, contact sales-at-atlassian-dot-com and see how they'd like to handle it.
I would recommend to you to reach the Atlassian sales and licensing team to get more information on this. You can create a ticket in this link https://support.atlassian.com/servicedesk/customer/portal/5/create/36
I’m a designer on the Jira team. For a long time, I’ve fielded questions from other designers about how they should be using Jira Software with their design team. I’ve also heard feedback from other ...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs