In 1998, Gullivers Pacific invested in Serko and in late 2004, with the float of Gullivers on the NZX, Serko became a wholly-owned subsidiary.
Gullivers was later taken over by Queensland's S8, which itself was bought out by the funds management company, MFS, in 2006.
Serko is now independently owned by the original founders - Darrin Grafton and Bob Shaw - and a group of private equity partners.
In 2004, the DeLoitte's Fast 500 growth survey ranked Serko as eighth fastest growing company in New Zealand. The same year, Serko was ranked as the the top Travel Industry Firm in Deloitte's "Unlimited Fast 50".
More than 60 per cent of all corporate travel agencies in New Zealand book through Serko systems, the company said.