Total revenue for Serko increased 50 percent year over year for the six months ending Sept. 30,

the New Zealand-based online booking and expense software provider announced Thursday. Revenue increased to NZ$4.7 million (US$3.7 million), with revenue from travel bookings, Serko's "core revenue growth engine," up 36 percent year over year. Online transaction volume rose 32 percent. Serko's net loss widened to NZ$3.6 million (US$2.8 million) from NZ$347,000 (US$272,000) for the prior-year period, which CFO Tim Bluett attributed to "the planned investment we have made in growing our organization and operational capacity to support the pipeline of growth for the business."