Transitional arrangements should be reached as soon as possible.
"There is an opportunity to increase confidence and spur growth," ISE exec says.
The hub simplifies access to systematic internalisers via an API.
Ten top ETF promoters gained market share in 2017.
End of last year was less disorderly than in 2016.
Systematic Internaliser has launched before September deadline.
Early observations include 'teething problems' with data.
Investors prefer systematic internalisers that are run by banks.
The long-awaited EU regulation will create winners and losers.