I'd rely on the fact that the company contact page lists "Sydney (HQ)" as the first office, followed by "San Francisco (HQ)" and then the non-HQ offices, as an

I'd rely on the fact that the company contact page lists "Sydney (HQ)" as the first office, followed by "San Francisco (HQ)" and then the non-HQ offices, as an assertion that they consider themselves to be an Australian-based company. As for top management, I believe both their co-CEOs are Sydney-based, and Mike Cannon-Brookes is well known for his occasional forays into Australian politics and public affairs...