Clark said every goal set at the time of the acquisition had been achieved.
The company had increased its client base from 300 financial institutions this time last year to 800, including US Bank.
"We are the fastest-growing part of Fiserv."
Its software enables bank customers to check their balances, transfer money and pay bills using their mobile phones.
Clark said the acquisition was not the only course of action available to M-Com at the time, but it was a logical one. "New Zealand is a very small market," Clark said. "Many of our banks have more customers than there are people in New Zealand.
"In New Zealand, either you become a generalist or you seek bigger markets. We sought to be the best in the world at providing mobile financial services. The US was the obvious market and Fiserv the obvious partner."
He said the Auckland office provided most of the intellectual property work for relevant Fiserv products - and the size of Fiserv enabled it to provide everything else that was necessary for success.
"Fiserv brings the maturity of process and governance you might not have in a smaller organisation - and capital."
Clark said he had become used to people saying that anyone who sold a company was a "greedy entrepreneur, selling New Zealand down the road".
But without Fiserv, M-Com would not have been generating the export dollars or employment opportunities it was in New Zealand.