Euronext, which is based in Adelaide Street, said it would be making the move in order “to be closer” to its core markets.
“This is extremely disappointing news, with the knock-on effects of such a potential loss of employments having devastating consequences for the wider area,” she said.
“The IT sector is a burgeoning one, so this news is deeply concerning. It is especially disappointing, given Euronext had originally intended this to be a centre of excellence.
“We must do what we can to lessen the impact on the affected employees and I will be discussing the issue with my Belfast City Council colleagues to ensure that is the case.”