The financial backer of SiteMinder and Stackla has led a $1.8 million investment in Rezdy, the tours and activities technology provider.
Bailadour Technology Investments was joined by fellow Australian money house Microequities VC Fund in the round.
The latest injection of funding will be used to support Rezdy's expansion strategy in the US.
Rezdy builds technology and platforms for suppliers and agents, covering channel management, booking systems and web-facing stores.
The company has previously raised a $1 million round in February 2014 (when it first opened a US office) and $3 million in October 2015, also featuring Bailadour.
It claims to have 45,000 "bookable traveler options" running through its platform and handles more than $1 billion in bookings over a 12-month period, with half of its overall revenue coming outside of it home market of Australia.
Bailadour investment director Andrea Kowalski says:
"The company has benefited from a strong foothold in this region without a significant presence on the ground, underscoring the extent of the opportunity created with fresh capital to focus growth efforts."